diff --git a/.eslintrc.yml b/.eslintrc.yml
new file mode 100644
index 0000000..b3e9bdd
--- /dev/null
+++ b/.eslintrc.yml
@@ -0,0 +1,12 @@
+---
+
+extends:
+  - airbnb-base
+
+parser: babel-eslint
+
+env:
+  jest: true
+
+rules:
+  no-console: 0
diff --git a/.gitignore b/.gitignore
index a1c22fe..279c635 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ node_modules/
 npm-debug.log
 test/tmp/*
 !test/tmp/.keep
+jest_0
diff --git a/.travis.yml b/.travis.yml
index b26d011..282e540 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,10 +1,9 @@
+---
+
 language: node_js
 node_js:
   - node
   - 10
   - 8
-  - 6
-  - 4
-  - 0.10
 script:
   - make test-ci
diff --git a/Makefile b/Makefile
index 1e67b69..128f3ef 100644
--- a/Makefile
+++ b/Makefile
@@ -2,8 +2,6 @@
 # Paths
 #
 
-TEST_EXEC=node_modules/.bin/hydro
-
 #
 # All
 #
@@ -22,7 +20,7 @@ install:
 #
 
 test:
-	@NODE_ENV=test $(TEST_EXEC)
+	npm test -s
 
 #
 # Clean
diff --git a/__tests__/__snapshots__/no-command.test.js.snap b/__tests__/__snapshots__/no-command.test.js.snap
new file mode 100644
index 0000000..f776213
--- /dev/null
+++ b/__tests__/__snapshots__/no-command.test.js.snap
@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`nixt#run throws an error when no command is supplied 1`] = `"Please provide a command to run. Hint: \`nixt#run\`"`;
diff --git a/__tests__/base.test.js b/__tests__/base.test.js
new file mode 100644
index 0000000..7611192
--- /dev/null
+++ b/__tests__/base.test.js
@@ -0,0 +1,11 @@
+const { nfixt } = require('./utils');
+
+describe('nixt#base', () => {
+  it('sets a base command', (done) => {
+    nfixt()
+      .base('node ')
+      .run('code-0.js')
+      .code(0)
+      .end(done);
+  });
+});
diff --git a/__tests__/code.test.js b/__tests__/code.test.js
new file mode 100644
index 0000000..1b980eb
--- /dev/null
+++ b/__tests__/code.test.js
@@ -0,0 +1,30 @@
+const { nfixt } = require('./utils');
+
+describe('nixt#code', () => {
+  it('can verify the exit code of a program', (done) => {
+    nfixt()
+      .run('node code-0.js')
+      .code(0)
+      .end(done);
+  });
+
+  it('returns an error when the exit code does not match the expected one', (done) => {
+    nfixt()
+      .run('node code-0.js')
+      .code(1)
+      .end((err) => {
+        expect(err.message).toBe('`node code-0.js`: Expected exit code: "1", actual: "0"');
+        done();
+      });
+  });
+
+  it('returns an error when the nonzero exit code does not match the expected one', (done) => {
+    nfixt()
+      .run('node code-1.js')
+      .code(0)
+      .end((err) => {
+        expect(err.message).toBe('`node code-1.js`: Expected exit code: "0", actual: "1"');
+        done();
+      });
+  });
+});
diff --git a/__tests__/colors.test.js b/__tests__/colors.test.js
new file mode 100644
index 0000000..2d8b8ee
--- /dev/null
+++ b/__tests__/colors.test.js
@@ -0,0 +1,13 @@
+const nixt = require('..');
+const { join } = require('path');
+
+describe('nixt', () => {
+  it('can strip colors from stdout and stderr', (done) => {
+    nixt({ colors: false })
+      .cwd(join(__dirname, 'fixtures'))
+      .run('node colors.js')
+      .stdout('Stdout')
+      .stderr('Stderr')
+      .end(done);
+  });
+});
diff --git a/__tests__/env.test.js b/__tests__/env.test.js
new file mode 100644
index 0000000..38d4d82
--- /dev/null
+++ b/__tests__/env.test.js
@@ -0,0 +1,12 @@
+const { nfixt } = require('./utils');
+
+describe('nixt#env', () => {
+  it('sets environemt variables', (done) => {
+    nfixt()
+      .env('HELLO', 'true')
+      .env('BYE', 'true')
+      .run('node env.js')
+      .code(0)
+      .end(done);
+  });
+});
diff --git a/__tests__/exec.test.js b/__tests__/exec.test.js
new file mode 100644
index 0000000..e2b6159
--- /dev/null
+++ b/__tests__/exec.test.js
@@ -0,0 +1,33 @@
+const fs = require('fs');
+const { join } = require('path');
+const { nfixt } = require('./utils');
+
+const file = join(__dirname, 'tmp', 'writefile-test5');
+
+describe('nixt#exec', () => {
+  it('runs the supplied command', (done) => {
+    nfixt()
+      .exec(`node ${join(__dirname, 'fixtures', 'create-file.js')} writefile-test5`)
+      .run('node writefile.js writefile-test5')
+      .stdout('File exists')
+      .unlink(file)
+      .end(done);
+  });
+
+  it('respects the current working directory', (done) => {
+    const root = join(__dirname, 'tmp');
+    const fixture = join(root, 'foo.tmp.js');
+
+    nfixt()
+      .cwd(root)
+      .exec('touch foo.tmp.js')
+      .run('')
+      .end((err) => {
+        // should.not.exist(err);
+        expect(err).toBeUndefined();
+        expect(fs.existsSync(fixture)).toBe(true);
+        fs.unlinkSync(fixture);
+        done();
+      });
+  });
+});
diff --git a/__tests__/exist.test.js b/__tests__/exist.test.js
new file mode 100644
index 0000000..d4c99f1
--- /dev/null
+++ b/__tests__/exist.test.js
@@ -0,0 +1,47 @@
+const fs = require('fs');
+const { join } = require('path');
+const { nfixt } = require('./utils');
+
+const file = join(__dirname, 'tmp', 'exists-file-test');
+const dir = join(__dirname, 'tmp', 'exists-dir-test');
+
+describe('nixt#exist', () => {
+  it('can verify that a file exists', (done) => {
+    nfixt()
+      .writeFile(file)
+      .run('node void.js')
+      .exist(file)
+      .unlink(file)
+      .end(done);
+  });
+
+  it('returns an error when the file does not exist', (done) => {
+    nfixt()
+      .run('node void.js')
+      .exist(file)
+      .end((err) => {
+        // (err !== null).should.eq(true);
+        expect(err).not.toBeNull();
+        done();
+      });
+  });
+
+  it('can verify that a directory exists', (done) => {
+    nfixt()
+      .mkdir(dir)
+      .run('node void.js')
+      .exist(dir)
+      .rmdir(dir)
+      .end(done);
+  });
+
+  it('returns an error when the directory does not exist', (done) => {
+    nfixt()
+      .run('node void.js')
+      .exist(dir)
+      .end((err) => {
+        expect(err).not.toBeNull();
+        done();
+      });
+  });
+});
diff --git a/__tests__/filters.test.js b/__tests__/filters.test.js
new file mode 100644
index 0000000..8f7021a
--- /dev/null
+++ b/__tests__/filters.test.js
@@ -0,0 +1,40 @@
+const fs = require('fs');
+const { join } = require('path');
+const { nfixt } = require('./utils');
+
+const file1 = join(__dirname, 'tmp', 'file-1');
+const file2 = join(__dirname, 'tmp', 'file-2');
+
+describe('nixt filters', () => {
+  it('runs the filters in the expected order', (done) => {
+    let before = 0;
+    let after = 0;
+
+    nfixt()
+      .before(() => {
+        before++;
+        fs.writeFileSync(file1, '');
+      })
+      .before((next) => {
+        before++;
+        expect(fs.existsSync(file1)).toBe(true);
+        fs.writeFile(file2, '', next);
+      })
+      .after(() => {
+        after++;
+        fs.unlinkSync(file1);
+        fs.unlinkSync(file2);
+      })
+      .run('node filters.js')
+      .stdout('Files exist')
+      .end(() => {
+        expect(before).toBe(2);
+        expect(after).toBe(1);
+
+        expect(fs.existsSync(file1)).toBe(false);
+        expect(fs.existsSync(file2)).toBe(false);
+
+        done();
+      });
+  });
+});
diff --git a/test/fixtures/code-0.js b/__tests__/fixtures/code-0.js
similarity index 100%
rename from test/fixtures/code-0.js
rename to __tests__/fixtures/code-0.js
diff --git a/test/fixtures/code-1.js b/__tests__/fixtures/code-1.js
similarity index 100%
rename from test/fixtures/code-1.js
rename to __tests__/fixtures/code-1.js
diff --git a/test/fixtures/colors.js b/__tests__/fixtures/colors.js
similarity index 100%
rename from test/fixtures/colors.js
rename to __tests__/fixtures/colors.js
diff --git a/__tests__/fixtures/create-file.js b/__tests__/fixtures/create-file.js
new file mode 100644
index 0000000..1523893
--- /dev/null
+++ b/__tests__/fixtures/create-file.js
@@ -0,0 +1,6 @@
+const fs = require('fs');
+const { join } = require('path');
+
+const file = join(__dirname, '..', 'tmp', process.argv[2]);
+
+fs.writeFileSync(file, '');
diff --git a/test/fixtures/env.js b/__tests__/fixtures/env.js
similarity index 100%
rename from test/fixtures/env.js
rename to __tests__/fixtures/env.js
diff --git a/__tests__/fixtures/filters.js b/__tests__/fixtures/filters.js
new file mode 100644
index 0000000..6962853
--- /dev/null
+++ b/__tests__/fixtures/filters.js
@@ -0,0 +1,11 @@
+const fs = require('fs');
+const { join } = require('path');
+
+const file1 = join(__dirname, '..', 'tmp', 'file-1');
+const file2 = join(__dirname, '..', 'tmp', 'file-2');
+
+if (fs.existsSync(file1) && fs.existsSync(file2)) {
+  console.log('Files exist');
+} else {
+  console.log('Files do not exist');
+}
diff --git a/test/fixtures/hello-err.js b/__tests__/fixtures/hello-err.js
similarity index 100%
rename from test/fixtures/hello-err.js
rename to __tests__/fixtures/hello-err.js
diff --git a/test/fixtures/hello.js b/__tests__/fixtures/hello.js
similarity index 100%
rename from test/fixtures/hello.js
rename to __tests__/fixtures/hello.js
diff --git a/__tests__/fixtures/mkdir.js b/__tests__/fixtures/mkdir.js
new file mode 100644
index 0000000..a9a4ac7
--- /dev/null
+++ b/__tests__/fixtures/mkdir.js
@@ -0,0 +1,8 @@
+const fs = require('fs');
+const { join } = require('path');
+
+const dir = join(__dirname, '..', 'tmp', process.argv[2]);
+
+if (fs.existsSync(dir)) {
+  console.log('Directory exists');
+}
diff --git a/test/fixtures/newlines-crlf.js b/__tests__/fixtures/newlines-crlf.js
similarity index 100%
rename from test/fixtures/newlines-crlf.js
rename to __tests__/fixtures/newlines-crlf.js
diff --git a/test/fixtures/newlines.js b/__tests__/fixtures/newlines.js
similarity index 100%
rename from test/fixtures/newlines.js
rename to __tests__/fixtures/newlines.js
diff --git a/__tests__/fixtures/prompt.js b/__tests__/fixtures/prompt.js
new file mode 100644
index 0000000..f70c417
--- /dev/null
+++ b/__tests__/fixtures/prompt.js
@@ -0,0 +1,10 @@
+const prompt = require('prompt');
+
+prompt.colors = false;
+prompt.start();
+
+prompt.get(['first', 'second'], (err, result) => {
+  console.log('Command-line input received:');
+  console.log(`  first: ${result.first}`);
+  console.log(`  second: ${result.second}`);
+});
diff --git a/__tests__/fixtures/rev.js b/__tests__/fixtures/rev.js
new file mode 100644
index 0000000..8001261
--- /dev/null
+++ b/__tests__/fixtures/rev.js
@@ -0,0 +1,17 @@
+let data = '';
+
+process.stdin.on('data', (chunk) => {
+  const lines = (data + chunk).split('\n');
+  data = lines.pop();
+  lines.forEach(printReversed);
+});
+
+process.stdin.on('end', () => {
+  if (data) {
+    printReversed(data);
+  }
+});
+
+function printReversed(line) {
+  console.log(line.split('').reverse().join(''));
+}
diff --git a/__tests__/fixtures/timeout.js b/__tests__/fixtures/timeout.js
new file mode 100644
index 0000000..488cd3d
--- /dev/null
+++ b/__tests__/fixtures/timeout.js
@@ -0,0 +1,2 @@
+console.log('output from spawned script');
+setTimeout(() => {}, 10000);
diff --git a/test/fixtures/void.js b/__tests__/fixtures/void.js
similarity index 100%
rename from test/fixtures/void.js
rename to __tests__/fixtures/void.js
diff --git a/__tests__/fixtures/writefile.js b/__tests__/fixtures/writefile.js
new file mode 100644
index 0000000..23c8d84
--- /dev/null
+++ b/__tests__/fixtures/writefile.js
@@ -0,0 +1,8 @@
+const fs = require('fs');
+const { join } = require('path');
+
+const file = join(__dirname, '..', 'tmp', process.argv[2]);
+
+if (fs.existsSync(file)) {
+  console.log('File exists');
+}
diff --git a/__tests__/match.test.js b/__tests__/match.test.js
new file mode 100644
index 0000000..0446f3d
--- /dev/null
+++ b/__tests__/match.test.js
@@ -0,0 +1,38 @@
+const { join } = require('path');
+const { nfixt } = require('./utils');
+
+describe('nixt#match', () => {
+  it('can assert with strings', (done) => {
+    const file = join(__dirname, 'tmp', 'writefile-test1');
+
+    nfixt()
+      .writeFile(file, 'Hello')
+      .run('node void.js')
+      .match(file, 'Hello')
+      .unlink(file)
+      .end(done);
+  });
+
+  it('can assert with regular expressions', (done) => {
+    const file = join(__dirname, 'tmp', 'writefile-test2');
+    nfixt()
+      .writeFile(file, 'Hello')
+      .run('node void.js')
+      .match(file, /ello/)
+      .unlink(file)
+      .end(done);
+  });
+
+  it('returns an error when the contents does not match the desired string', (done) => {
+    const file = join(__dirname, 'tmp', 'writefile-test3');
+    nfixt()
+      .writeFile(file, 'Hello')
+      .run('node void.js')
+      .match(file, 'Bye')
+      .unlink(file)
+      .end((err) => {
+        expect(err).not.toBeNull();
+        done();
+      });
+  });
+});
diff --git a/__tests__/mkdir.test.js b/__tests__/mkdir.test.js
new file mode 100644
index 0000000..2905073
--- /dev/null
+++ b/__tests__/mkdir.test.js
@@ -0,0 +1,18 @@
+const fs = require('fs');
+const { join } = require('path');
+const { nfixt } = require('./utils');
+
+const dir = join(__dirname, 'tmp', 'mkdir-test');
+
+describe('nixt#mkdir', () => {
+  it('creates a new directory', (done) => {
+    nfixt()
+      .mkdir(dir)
+      .run('node mkdir.js mkdir-test')
+      .stdout('Directory exists')
+      .after(() => {
+        fs.rmdirSync(dir);
+      })
+      .end(done);
+  });
+});
diff --git a/__tests__/newlines.test.js b/__tests__/newlines.test.js
new file mode 100644
index 0000000..28e9377
--- /dev/null
+++ b/__tests__/newlines.test.js
@@ -0,0 +1,41 @@
+const nixt = require('..');
+const { join } = require('path');
+const { nfixt } = require('./utils');
+
+describe('nixt', () => {
+  it('can strip \\n from stdout and stderr', (done) => {
+    nixt({ newlines: false })
+      .cwd(join(__dirname, 'fixtures'))
+      .run('node newlines.js')
+      .stdout('Hello from newlines.js')
+      .stderr('Error from newlines.js')
+      .end(done);
+  });
+
+  it('can leave \\n in stdout and stderr', (done) => {
+    nixt({ newlines: true })
+      .cwd(join(__dirname, 'fixtures'))
+      .run('node newlines.js')
+      .stdout('Hello \nfrom \nnewlines.js')
+      .stderr('Error \nfrom \nnewlines.js')
+      .end(done);
+  });
+
+  it('can strip \\r\\n from stdout and stderr', (done) => {
+    nixt({ newlines: false })
+      .cwd(join(__dirname, 'fixtures'))
+      .run('node newlines-crlf.js')
+      .stdout('Hello from newlines-crlf.js')
+      .stderr('Error from newlines-crlf.js')
+      .end(done);
+  });
+
+  it('can leave \\r\\n in stdout and stderr', (done) => {
+    nixt({ newlines: true })
+      .cwd(join(__dirname, 'fixtures'))
+      .run('node newlines-crlf.js')
+      .stdout('Hello \r\nfrom \r\nnewlines-crlf.js')
+      .stderr('Error \r\nfrom \r\nnewlines-crlf.js')
+      .end(done);
+  });
+});
diff --git a/__tests__/no-command.test.js b/__tests__/no-command.test.js
new file mode 100644
index 0000000..2e06e0f
--- /dev/null
+++ b/__tests__/no-command.test.js
@@ -0,0 +1,9 @@
+const nixt = require('..');
+
+describe('nixt#run', () => {
+  it('throws an error when no command is supplied', () => {
+    expect(() => {
+      nixt().end(() => {});
+    }).toThrowErrorMatchingSnapshot();
+  });
+});
diff --git a/__tests__/plugin.test.js b/__tests__/plugin.test.js
new file mode 100644
index 0000000..f61e540
--- /dev/null
+++ b/__tests__/plugin.test.js
@@ -0,0 +1,18 @@
+const nixt = require('..');
+
+describe('nixt.register', () => {
+  it('can register a single function', () => {
+    const fn = () => 'registered';
+    nixt.register('foo', fn);
+    expect(nixt().foo()).toBe('registered');
+  });
+
+  it('can register multiple functions at once', () => {
+    const fn = () => 'first';
+    const fn2 = () => 'second';
+
+    nixt.register({ baz: fn, bar: fn2 });
+    expect(nixt().baz()).toBe('first');
+    expect(nixt().bar()).toBe('second');
+  });
+});
diff --git a/__tests__/prompt.test.js b/__tests__/prompt.test.js
new file mode 100644
index 0000000..a192f8a
--- /dev/null
+++ b/__tests__/prompt.test.js
@@ -0,0 +1,39 @@
+const { nfixt } = require('./utils');
+
+describe('nixt', () => {
+  it('can respond to prompts ending in a literal string', (done) => {
+    nfixt()
+      .run('node prompt.js')
+      .on('prompt: first: ').respond('first response\n')
+      .on('prompt: second: ')
+      .respond('second response\n')
+      .stdout(/first: first response/)
+      .stdout(/second: second response/)
+      .code(0)
+      .end(done);
+  });
+
+  it('can respond to prompts matching an expression', (done) => {
+    nfixt()
+      .run('node prompt.js')
+      .on(/prompt: (.+): $/).respond('first response\n')
+      .on(/prompt: (.+): $/)
+      .respond('second response\n')
+      .stdout(/first: first response/)
+      .stdout(/second: second response/)
+      .code(0)
+      .end(done);
+  });
+
+  it('can respond to prompts with regexp groups', (done) => {
+    nfixt()
+      .run('node prompt.js')
+      .on(/prompt: (.+): $/).respond(([first]) => `${first}\n`)
+      .on(/(\w+): (\w+): $/)
+      .respond(([group1, group2]) => `${group1}, ${group2}\n`)
+      .stdout(/first: first/)
+      .stdout(/prompt, second/)
+      .code(0)
+      .end(done);
+  });
+});
diff --git a/__tests__/rmdir.test.js b/__tests__/rmdir.test.js
new file mode 100644
index 0000000..09ac71f
--- /dev/null
+++ b/__tests__/rmdir.test.js
@@ -0,0 +1,19 @@
+const fs = require('fs');
+const { join } = require('path');
+const { nfixt } = require('./utils');
+
+const dir = join(__dirname, 'tmp', 'mkdir-test2');
+
+describe('nixt#rmdir', () => {
+  it('removes a directory', (done) => {
+    nfixt()
+      .mkdir(dir)
+      .run('node mkdir.js mkdir-test2')
+      .stdout('Directory exists')
+      .rmdir(dir)
+      .after(() => {
+        expect(fs.existsSync(dir)).toBe(false);
+      })
+      .end(done);
+  });
+});
diff --git a/__tests__/stderr.test.js b/__tests__/stderr.test.js
new file mode 100644
index 0000000..34d64fd
--- /dev/null
+++ b/__tests__/stderr.test.js
@@ -0,0 +1,37 @@
+const { nfixt } = require('./utils');
+
+describe('nixt#stderr', () => {
+  it('can assert with strings', (done) => {
+    nfixt()
+      .run('node hello-err.js')
+      .stderr('Hello')
+      .end(done);
+  });
+
+  it('returns an error when stderr does not match the desired string', (done) => {
+    nfixt()
+      .run('node hello-err.js')
+      .stderr('Fail')
+      .end((err) => {
+        expect(err.message).toBe('`node hello-err.js`: Expected stderr to match "Fail". Actual: "Hello"');
+        done();
+      });
+  });
+
+  it('can assert with regular expressions', (done) => {
+    nfixt()
+      .run('node hello-err.js')
+      .stderr(/Hell/)
+      .end(done);
+  });
+
+  it('returns an error when the regexp does not match the stderr', (done) => {
+    nfixt()
+      .run('node hello-err.js')
+      .stderr(/Fail/)
+      .end((err) => {
+        expect(err.message).toBe('`node hello-err.js`: Expected stderr to match "/Fail/". Actual: "Hello"');
+        done();
+      });
+  });
+});
diff --git a/__tests__/stdin.test.js b/__tests__/stdin.test.js
new file mode 100644
index 0000000..b6b621d
--- /dev/null
+++ b/__tests__/stdin.test.js
@@ -0,0 +1,26 @@
+const { nfixt } = require('./utils');
+
+describe('nixt#stdin', () => {
+  it('no effect if stdin is not used', (done) => {
+    nfixt()
+      .run('node hello.js')
+      .stdout('Hello')
+      .end(done);
+  });
+
+  it('passes given string on stdin', (done) => {
+    nfixt()
+      .stdin('foo\nbar')
+      .run('node rev.js')
+      .stdout('oof\nrab')
+      .end(done);
+  });
+
+  it('does end the input stream', (done) => {
+    nfixt()
+      .stdin('')
+      .run('node rev.js')
+      .stdout('')
+      .end(done);
+  });
+});
diff --git a/__tests__/stdout.test.js b/__tests__/stdout.test.js
new file mode 100644
index 0000000..d056287
--- /dev/null
+++ b/__tests__/stdout.test.js
@@ -0,0 +1,37 @@
+const { nfixt } = require('./utils');
+
+describe('nixt#stdout', () => {
+  it('can assert with strings', (done) => {
+    nfixt()
+      .run('node hello.js')
+      .stdout('Hello')
+      .end(done);
+  });
+
+  it('returns an error when stdout does not match the desired string', (done) => {
+    nfixt()
+      .run('node hello.js')
+      .stdout('Fail')
+      .end((err) => {
+        expect(err.message).toBe('`node hello.js`: Expected stdout to match "Fail". Actual: "Hello"');
+        done();
+      });
+  });
+
+  it('can assert with regular expressions', (done) => {
+    nfixt()
+      .run('node hello.js')
+      .stdout(/Hell/)
+      .end(done);
+  });
+
+  it('returns an error when the regexp does not match the stdout', (done) => {
+    nfixt()
+      .run('node hello.js')
+      .stdout(/Fail/)
+      .end((err) => {
+        expect(err.message).toBe('`node hello.js`: Expected stdout to match "/Fail/". Actual: "Hello"');
+        done();
+      });
+  });
+});
diff --git a/__tests__/timeout.test.js b/__tests__/timeout.test.js
new file mode 100644
index 0000000..6a30aad
--- /dev/null
+++ b/__tests__/timeout.test.js
@@ -0,0 +1,14 @@
+const { nfixt } = require('./utils');
+
+describe('nixt#timeout', () => {
+  it('force quits comamnds that take longer than specified', (done) => {
+    nfixt()
+      .run('node timeout.js')
+      .stdout(/output from spawned script/)
+      .timeout(800)
+      .end((err) => {
+        expect(err.message).toBe('`node timeout.js`: Command execution terminated (timeout)');
+        done();
+      });
+  });
+});
diff --git a/test/tmp/.keep b/__tests__/tmp/.keep
similarity index 100%
rename from test/tmp/.keep
rename to __tests__/tmp/.keep
diff --git a/__tests__/unlink.test.js b/__tests__/unlink.test.js
new file mode 100644
index 0000000..227229d
--- /dev/null
+++ b/__tests__/unlink.test.js
@@ -0,0 +1,19 @@
+const fs = require('fs');
+const { join } = require('path');
+const { nfixt } = require('./utils');
+
+const file = join(__dirname, 'tmp', 'writefile-test6');
+
+describe('nixt#unlink', () => {
+  it('removes a file', (done) => {
+    nfixt()
+      .writeFile(file)
+      .run('node writefile.js writefile-test6')
+      .stdout('File exists')
+      .unlink(file)
+      .after(() => {
+        expect(fs.existsSync(file)).toBe(false);
+      })
+      .end(done);
+  });
+});
diff --git a/__tests__/utils/index.js b/__tests__/utils/index.js
new file mode 100644
index 0000000..70f79cb
--- /dev/null
+++ b/__tests__/utils/index.js
@@ -0,0 +1,8 @@
+const path = require('path');
+const nixt = require('../..');
+
+const nfixt = () => nixt().cwd(path.join(__dirname, '..', 'fixtures'));
+
+module.exports = {
+  nfixt,
+};
diff --git a/__tests__/writefile.test.js b/__tests__/writefile.test.js
new file mode 100644
index 0000000..5428183
--- /dev/null
+++ b/__tests__/writefile.test.js
@@ -0,0 +1,18 @@
+const fs = require('fs');
+const { join } = require('path');
+const { nfixt } = require('./utils');
+
+
+describe('nixt#writeFile', () => {
+  it('creates a new file', (done) => {
+    const file = join(__dirname, 'tmp', 'writefile-test4');
+    nfixt()
+      .writeFile(file)
+      .run('node writefile.js writefile-test4')
+      .stdout('File exists')
+      .after(() => {
+        fs.unlinkSync(file);
+      })
+      .end(done);
+  });
+});
diff --git a/hydro.conf.js b/hydro.conf.js
deleted file mode 100644
index f4216e7..0000000
--- a/hydro.conf.js
+++ /dev/null
@@ -1,49 +0,0 @@
-/**
- * External dependencies.
- */
-
-var join = require('path').join;
-
-/**
- * Internal dependencies.
- */
-
-var nixt = require('./');
-
-/**
- * Nixt template that has the fixtures dir as a CWD.
- *
- * @returns {Object}
- * @api public
- */
-
-function nfixt() {
-  return nixt().cwd(join(__dirname, 'test', 'fixtures'));
-}
-
-/**
- * Test setup.
- *
- * @param {Object} hydro
- * @api public
- */
-
-module.exports = function(hydro) {
-  hydro.set({
-    formatter: 'hydro-dot',
-    globals: {
-      nfixt: nfixt,
-    },
-    chai: {
-      styles: 'should',
-      stack: true,
-    },
-    tests: [
-      'test/*.test.js'
-    ],
-    plugins: [
-      'hydro-chai',
-      'hydro-bdd',
-    ],
-  });
-};
diff --git a/jest.config.js b/jest.config.js
new file mode 100644
index 0000000..7ee7c65
--- /dev/null
+++ b/jest.config.js
@@ -0,0 +1,7 @@
+module.exports = {
+  testEnvironment: 'node',
+  modulePathIgnorePatterns: [
+    '<rootDir>/__tests__/fixtures',
+    '<rootDir>/__tests__/utils',
+  ],
+};
diff --git a/lib/nixt/batch.js b/lib/nixt/batch.js
index 6005348..d1f5417 100644
--- a/lib/nixt/batch.js
+++ b/lib/nixt/batch.js
@@ -62,7 +62,7 @@ function Batch() {
  * @api public
  */
 
-Batch.prototype.addBefore = function(fn) {
+Batch.prototype.addBefore = function (fn) {
   this.before.push(fn);
 };
 
@@ -73,7 +73,7 @@ Batch.prototype.addBefore = function(fn) {
  * @api public
  */
 
-Batch.prototype.addAfter = function(fn) {
+Batch.prototype.addAfter = function (fn) {
   this.after.push(fn);
 };
 
@@ -88,7 +88,7 @@ Batch.prototype.addAfter = function(fn) {
  * @api public
  */
 
-Batch.prototype.add = function(fn) {
+Batch.prototype.add = function (fn) {
   (this.hasMain() ? this.beforeAfter : this.afterBefore).push(fn);
 };
 
@@ -99,7 +99,7 @@ Batch.prototype.add = function(fn) {
  * @api public
  */
 
-Batch.prototype.main = function(fn) {
+Batch.prototype.main = function (fn) {
   this.fn = fn;
 };
 
@@ -110,7 +110,7 @@ Batch.prototype.main = function(fn) {
  * @api public
  */
 
-Batch.prototype.hasMain = function() {
+Batch.prototype.hasMain = function () {
   return !!this.fn;
 };
 
@@ -122,23 +122,23 @@ Batch.prototype.hasMain = function() {
  * @api public
  */
 
-Batch.prototype.run = function(fn) {
-  var err = null;
-  var main = this.fn;
-  var batch = this.before.slice(0).concat(this.afterBefore);
+Batch.prototype.run = function (fn) {
+  let err = null;
+  const main = this.fn;
+  let batch = this.before.slice(0).concat(this.afterBefore);
 
-  batch.push(function(next) {
-    main(function(e) { err = e; next(); });
+  batch.push((next) => {
+    main((e) => { err = e; next(); });
   });
 
   batch = batch.concat(this.beforeAfter).concat(this.after);
 
-  batch.push(function() {
+  batch.push(() => {
     fn(err);
   });
 
   function next() {
-    var fn = batch.shift();
+    const fn = batch.shift();
     if (!fn) return;
     if (fn.length) return fn(next);
     fn();
diff --git a/lib/nixt/expectations.js b/lib/nixt/expectations.js
index 39ff8c3..a2d603c 100644
--- a/lib/nixt/expectations.js
+++ b/lib/nixt/expectations.js
@@ -2,13 +2,13 @@
  * Core dependencies.
  */
 
-var fs = require('fs');
+const fs = require('fs');
 
 /**
  * External dependencies.
  */
 
-var AssertionError = require('assertion-error');
+const AssertionError = require('assertion-error');
 
 /**
  * Return an exit code expectation.
@@ -18,10 +18,10 @@ var AssertionError = require('assertion-error');
  * @api public
  */
 
-exports.code = function(code) {
-  return function(result) {
+exports.code = function (code) {
+  return function (result) {
     if (code !== result.code) {
-      var message = 'Expected exit code: "' + code + '", actual: "' + result.code + '"';
+      const message = `Expected exit code: "${code}", actual: "${result.code}"`;
       return error(result, message, code, result.code);
     }
   };
@@ -34,8 +34,8 @@ exports.code = function(code) {
  * @api public
  */
 
-exports.time = function() {
-  return function(result) {
+exports.time = function () {
+  return function (result) {
     if (result.killed) {
       return error(result, 'Command execution terminated (timeout)');
     }
@@ -50,8 +50,8 @@ exports.time = function() {
  * @api public
  */
 
-exports.stderr = function(expected) {
-  return function(result) {
+exports.stderr = function (expected) {
+  return function (result) {
     return assertOut('stderr', expected, result);
   };
 };
@@ -64,8 +64,8 @@ exports.stderr = function(expected) {
  * @api public
  */
 
-exports.stdout = function(expected) {
-  return function(result) {
+exports.stdout = function (expected) {
+  return function (result) {
     return assertOut('stdout', expected, result);
   };
 };
@@ -78,10 +78,10 @@ exports.stdout = function(expected) {
  * @api public
  */
 
-exports.exists = function(path) {
-  return function(result) {
+exports.exists = function (path) {
+  return function (result) {
     if (fs.existsSync(path) !== true) {
-      return error(result, 'Expected "' + path + '" to exist.');
+      return error(result, `Expected "${path}" to exist.`);
     }
   };
 };
@@ -95,15 +95,15 @@ exports.exists = function(path) {
  * @api public
  */
 
-exports.match = function(path, data) {
-  return function(result) {
-    var contents = fs.readFileSync(path, { encoding: 'utf8' });
-    var statement = data instanceof RegExp
+exports.match = function (path, data) {
+  return function (result) {
+    const contents = fs.readFileSync(path, { encoding: 'utf8' });
+    const statement = data instanceof RegExp
       ? data.test(contents)
       : data === contents;
 
     if (statement !== true) {
-      var message = 'Expected "' + path + '" to match "' + data + '", but it was: "' + contents + '"';
+      const message = `Expected "${path}" to match "${data}", but it was: "${contents}"`;
       return error(result, message, data, contents);
     }
   };
@@ -120,13 +120,13 @@ exports.match = function(path, data) {
  */
 
 function assertOut(key, expected, result) {
-  var actual = result[key];
-  var statement = expected instanceof RegExp
+  const actual = result[key];
+  const statement = expected instanceof RegExp
     ? expected.test(actual)
     : expected === actual;
 
   if (statement !== true) {
-    var message = 'Expected ' + key +' to match "' + expected + '". Actual: "' + actual + '"';
+    const message = `Expected ${key} to match "${expected}". Actual: "${actual}"`;
     return error(result, message, expected, actual);
   }
 }
@@ -148,7 +148,7 @@ function assertOut(key, expected, result) {
  */
 
 function error(result, message, expected, actual) {
-  var err = new AssertionError('`' + result.cmd + '`: ' + message);
+  const err = new AssertionError(`\`${result.cmd}\`: ${message}`);
   err.result = result;
   if (expected) err.expected = expected;
   if (actual) err.actual = actual;
diff --git a/lib/nixt/middlewares.js b/lib/nixt/middlewares.js
index 3da8fb7..3d3c707 100644
--- a/lib/nixt/middlewares.js
+++ b/lib/nixt/middlewares.js
@@ -2,8 +2,8 @@
  * Core dependencies.
  */
 
-var exec = require('child_process').exec;
-var fs = require('fs');
+const { exec } = require('child_process');
+const fs = require('fs');
 
 /**
  * Asynchronous mkdir(2).
@@ -14,8 +14,8 @@ var fs = require('fs');
  * @api public
  */
 
-exports.mkdir = function(path) {
-  return function(next) {
+exports.mkdir = function (path) {
+  return function (next) {
     fs.mkdir(path, done(next));
   };
 };
@@ -31,8 +31,8 @@ exports.mkdir = function(path) {
  * @api public
  */
 
-exports.writeFile = function(path, data) {
-  return function(next) {
+exports.writeFile = function (path, data) {
+  return function (next) {
     fs.writeFile(path, data, done(next));
   };
 };
@@ -46,8 +46,8 @@ exports.writeFile = function(path, data) {
  * @api public
  */
 
-exports.rmdir = function(path) {
-  return function(next) {
+exports.rmdir = function (path) {
+  return function (next) {
     fs.rmdir(path, done(next));
   };
 };
@@ -61,8 +61,8 @@ exports.rmdir = function(path) {
  * @api public
  */
 
-exports.unlink = function(path) {
-  return function(next) {
+exports.unlink = function (path) {
+  return function (next) {
     fs.unlink(path, done(next));
   };
 };
@@ -77,8 +77,8 @@ exports.unlink = function(path) {
  * @api public
  */
 
-exports.exec = function(cmd, world) {
-  return function(next) {
+exports.exec = function (cmd, world) {
+  return function (next) {
     exec(cmd, world, next);
   };
 };
@@ -92,7 +92,7 @@ exports.exec = function(cmd, world) {
  */
 
 function done(next) {
-  return function(err) {
+  return function (err) {
     if (err) throw err;
     next();
   };
diff --git a/lib/nixt/plugin.js b/lib/nixt/plugin.js
index bc6a6d6..726c250 100644
--- a/lib/nixt/plugin.js
+++ b/lib/nixt/plugin.js
@@ -2,7 +2,7 @@
  * Internal dependencies.
  */
 
-var Runner = require('./runner');
+const Runner = require('./runner');
 
 /**
  * Primitive plugin support.
@@ -42,8 +42,8 @@ var Runner = require('./runner');
  * @api public
  */
 
-module.exports = function(name, fn) {
-  var reg = null;
+module.exports = function (name, fn) {
+  let reg = null;
 
   if (Object(name) !== name) {
     reg = Object.create(null);
@@ -52,7 +52,7 @@ module.exports = function(name, fn) {
     reg = name;
   }
 
-  Object.keys(reg).forEach(function(key) {
+  Object.keys(reg).forEach((key) => {
     Runner.prototype[key] = reg[key];
   });
 };
diff --git a/lib/nixt/respond.js b/lib/nixt/respond.js
index fd83a6e..69cbe11 100644
--- a/lib/nixt/respond.js
+++ b/lib/nixt/respond.js
@@ -12,11 +12,13 @@
  * @api public
  */
 
-exports.run = function(readable, writable, expects, responses) {
-  var needNew = true, buffer = '', match = false;
-  var expect = '', response = '';
+exports.run = function (readable, writable, expects, responses) {
+  let needNew = true; let buffer = ''; let
+    match = false;
+  let expect = ''; let
+    response = '';
 
-  readable.on('data', function(data){
+  readable.on('data', (data) => {
     buffer += data.toString();
     if (needNew) {
       expect = expects.shift();
@@ -25,20 +27,22 @@ exports.run = function(readable, writable, expects, responses) {
     }
 
     if (typeof expect === 'string') {
-      match = buffer.lastIndexOf(expect) == buffer.length - expect.length;
+      match = buffer.lastIndexOf(expect) === buffer.length - expect.length;
+      writable.write(response);
     } else if (typeof expect === 'object') {
-      match = (buffer.match(expect) != null);
+      const matches = buffer.match(expect);
+      const text = (typeof response === 'function') ? response(matches.slice(1)) : response;
+      writable.write(text);
+      match = matches !== null;
     }
 
     if (match) {
       needNew = true;
-      writable.write(response);
       match = false;
 
       if (expects.length === 0 && responses.length === 0) {
         writable.end();
       }
     }
-
   });
 };
diff --git a/lib/nixt/result.js b/lib/nixt/result.js
index 7b63f62..3ad749a 100644
--- a/lib/nixt/result.js
+++ b/lib/nixt/result.js
@@ -21,7 +21,7 @@ function Result(cmd, code, options) {
  * @api public
  */
 
-Result.prototype.parse = function(stdout, stderr, err) {
+Result.prototype.parse = function (stdout, stderr, err) {
   this.err = err;
   this.code = err ? err.code : this.code;
   this.killed = err && err.killed;
@@ -46,7 +46,7 @@ Result.prototype.parse = function(stdout, stderr, err) {
  * @api private
  */
 
-Result.prototype.strip = function(str) {
+Result.prototype.strip = function (str) {
   str = str.replace(/\r?\n$/, '');
 
   if (this.options.newlines === false) {
diff --git a/lib/nixt/runner.js b/lib/nixt/runner.js
index 3983f5f..1a05c56 100644
--- a/lib/nixt/runner.js
+++ b/lib/nixt/runner.js
@@ -2,19 +2,19 @@
  * External dependencies.
  */
 
-var clone = require('clone');
-var spawn = require('child_process').spawn;
+const clone = require('clone');
+const { spawn } = require('child_process');
 
 /**
  * Internal dependencies.
  */
 
-var Batch = require('./batch');
-var World = require('./world');
-var expect = require('./expectations');
-var middlewares = require('./middlewares');
-var Result = require('./result');
-var respond = require('./respond');
+const Batch = require('./batch');
+const World = require('./world');
+const expect = require('./expectations');
+const middlewares = require('./middlewares');
+const Result = require('./result');
+const respond = require('./respond');
 
 /**
  * The primary entry point for every Nixt test.
@@ -71,8 +71,8 @@ function Runner(options) {
   if (!(this instanceof Runner)) return new Runner(options);
   options = options || {};
   this.options = options;
-  this.batch = new Batch;
-  this.world = new World;
+  this.batch = new Batch();
+  this.world = new World();
   this.expectations = [];
   this.prompts = [];
   this.responses = [];
@@ -89,7 +89,7 @@ function Runner(options) {
  * @api public
  */
 
-Runner.prototype.before = function(fn) {
+Runner.prototype.before = function (fn) {
   this.batch.addBefore(fn);
   return this;
 };
@@ -103,7 +103,7 @@ Runner.prototype.before = function(fn) {
  * @api public
  */
 
-Runner.prototype.after = function(fn) {
+Runner.prototype.after = function (fn) {
   this.batch.addAfter(fn);
   return this;
 };
@@ -117,7 +117,7 @@ Runner.prototype.after = function(fn) {
  * @api public
  */
 
-Runner.prototype.cwd = function(path) {
+Runner.prototype.cwd = function (path) {
   this.world.cwd = path;
   return this;
 };
@@ -133,7 +133,7 @@ Runner.prototype.cwd = function(path) {
  * @api public
  */
 
-Runner.prototype.base = function(cmd) {
+Runner.prototype.base = function (cmd) {
   this.baseCmd = cmd;
   return this;
 };
@@ -146,7 +146,7 @@ Runner.prototype.base = function(cmd) {
  * @api public
  */
 
-Runner.prototype.stdin = function(data) {
+Runner.prototype.stdin = function (data) {
   this.standardInput = data || '';
   return this;
 };
@@ -160,7 +160,7 @@ Runner.prototype.stdin = function(data) {
  * @api public
  */
 
-Runner.prototype.env = function(key, val) {
+Runner.prototype.env = function (key, val) {
   this.world.env[key] = val;
   return this;
 };
@@ -174,7 +174,7 @@ Runner.prototype.env = function(key, val) {
  * @api public
  */
 
-Runner.prototype.run = function(cmd, fn) {
+Runner.prototype.run = function (cmd, fn) {
   this.batch.main(this.execFn(this.baseCmd + cmd));
   if (fn) this.end(fn);
   return this;
@@ -188,7 +188,7 @@ Runner.prototype.run = function(cmd, fn) {
  * @api public
  */
 
-Runner.prototype.timeout = function(ms) {
+Runner.prototype.timeout = function (ms) {
   this.world.timeout = ms;
   this.expect(expect.time(ms));
   return this;
@@ -202,7 +202,7 @@ Runner.prototype.timeout = function(ms) {
  * @api public
  */
 
-Runner.prototype.stdout = function(pattern) {
+Runner.prototype.stdout = function (pattern) {
   this.expect(expect.stdout(pattern));
   return this;
 };
@@ -215,7 +215,7 @@ Runner.prototype.stdout = function(pattern) {
  * @api public
  */
 
-Runner.prototype.stderr = function(pattern) {
+Runner.prototype.stderr = function (pattern) {
   this.expect(expect.stderr(pattern));
   return this;
 };
@@ -228,7 +228,7 @@ Runner.prototype.stderr = function(pattern) {
  * @api public
  */
 
-Runner.prototype.code = function(code) {
+Runner.prototype.code = function (code) {
   this.expect(expect.code(code));
   return this;
 };
@@ -241,7 +241,7 @@ Runner.prototype.code = function(code) {
  * @api public
  */
 
-Runner.prototype.exist = function(path) {
+Runner.prototype.exist = function (path) {
   this.expect(expect.exists(path));
   return this;
 };
@@ -254,7 +254,7 @@ Runner.prototype.exist = function(path) {
  * @api public
  */
 
-Runner.prototype.match = function(file, pattern) {
+Runner.prototype.match = function (file, pattern) {
   this.expect(expect.match(file, pattern));
   return this;
 };
@@ -267,7 +267,7 @@ Runner.prototype.match = function(file, pattern) {
  * @api public
  */
 
-Runner.prototype.mkdir = function(path) {
+Runner.prototype.mkdir = function (path) {
   this.batch.add(middlewares.mkdir(path));
   return this;
 };
@@ -281,7 +281,7 @@ Runner.prototype.mkdir = function(path) {
  * @api public
  */
 
-Runner.prototype.exec = function(cmd, world) {
+Runner.prototype.exec = function (cmd, world) {
   world = world || this.world;
   this.batch.add(middlewares.exec(cmd, world));
   return this;
@@ -296,7 +296,7 @@ Runner.prototype.exec = function(cmd, world) {
  * @api public
  */
 
-Runner.prototype.writeFile = function(path, data) {
+Runner.prototype.writeFile = function (path, data) {
   this.batch.add(middlewares.writeFile(path, data));
   return this;
 };
@@ -309,7 +309,7 @@ Runner.prototype.writeFile = function(path, data) {
  * @api public
  */
 
-Runner.prototype.rmdir = function(path) {
+Runner.prototype.rmdir = function (path) {
   this.batch.add(middlewares.rmdir(path));
   return this;
 };
@@ -322,7 +322,7 @@ Runner.prototype.rmdir = function(path) {
  * @api public
  */
 
-Runner.prototype.unlink = function(path) {
+Runner.prototype.unlink = function (path) {
   this.batch.add(middlewares.unlink(path));
   return this;
 };
@@ -335,7 +335,7 @@ Runner.prototype.unlink = function(path) {
  * @api public
  */
 
-Runner.prototype.on = function(pattern) {
+Runner.prototype.on = function (pattern) {
   this.prompts.push(pattern);
   return this;
 };
@@ -348,7 +348,7 @@ Runner.prototype.on = function(pattern) {
  * @api public
  */
 
-Runner.prototype.respond = function(response) {
+Runner.prototype.respond = function (response) {
   this.responses.push(response);
   return this;
 };
@@ -361,7 +361,7 @@ Runner.prototype.respond = function(response) {
  * @api public
  */
 
-Runner.prototype.end = function(fn) {
+Runner.prototype.end = function (fn) {
   if (!this.batch.hasMain()) {
     throw new Error('Please provide a command to run. Hint: `nixt#run`');
   }
@@ -375,7 +375,7 @@ Runner.prototype.end = function(fn) {
  * @api public
  */
 
-Runner.prototype.clone = function() {
+Runner.prototype.clone = function () {
   return clone(this, false);
 };
 
@@ -386,7 +386,7 @@ Runner.prototype.clone = function() {
  * @api public
  */
 
-Runner.prototype.expect = function(fn) {
+Runner.prototype.expect = function (fn) {
   this.expectations.push(fn);
   return this;
 };
@@ -399,26 +399,26 @@ Runner.prototype.expect = function(fn) {
  * @api private
  */
 
-Runner.prototype.execFn = function(cmd) {
-  var self = this;
-  var args = require('shell-quote').parse(cmd);
-  var bin = args.shift(0);
+Runner.prototype.execFn = function (cmd) {
+  const self = this;
+  const args = require('shell-quote').parse(cmd);
+  const bin = args.shift(0);
 
-  return function(fn) {
+  return function (fn) {
     // Allow .run('') without attempting
     if (cmd === '') { fn(undefined); return; }
 
-    var child = spawn(bin, args, self.world);
-    var stdout = '';
-    var stderr = '';
-    var err;
+    const child = spawn(bin, args, self.world);
+    let stdout = '';
+    let stderr = '';
+    let err;
 
     if (self.standardInput != null) {
       child.stdin.end(self.standardInput);
     }
 
     if (self.world.timeout) {
-      setTimeout(function() {
+      setTimeout(() => {
         child.kill();
         err = { killed: true };
       }, self.world.timeout);
@@ -426,14 +426,14 @@ Runner.prototype.execFn = function(cmd) {
 
     respond.run(child.stdout, child.stdin, self.prompts, self.responses);
 
-    child.stdout.on('data', function(data) { stdout += data; });
-    child.stderr.on('data', function(data) { stderr += data; });
+    child.stdout.on('data', (data) => { stdout += data; });
+    child.stderr.on('data', (data) => { stderr += data; });
 
-    child.on('close', function(code) {
-      var error = null;
-      var result = new Result(cmd, code, self.options).parse(stdout, stderr, err);
+    child.on('close', (code) => {
+      let error = null;
+      const result = new Result(cmd, code, self.options).parse(stdout, stderr, err);
 
-      for (var i = 0, len = self.expectations.length; i < len; i++) {
+      for (let i = 0, len = self.expectations.length; i < len; i++) {
         error = self.expectations[i](result);
         if (error) break;
       }
diff --git a/lib/nixt/world.js b/lib/nixt/world.js
index 428b174..2786875 100644
--- a/lib/nixt/world.js
+++ b/lib/nixt/world.js
@@ -2,7 +2,7 @@
  * External dependencies.
  */
 
-var clone = require('clone');
+const clone = require('clone');
 
 /**
  * Contain the environment variables and the
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..03ecb8d
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,5944 @@
+{
+  "name": "nixt",
+  "version": "0.5.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
+      "integrity": "sha1-BuKrGb21NThVWaq7W6WXKUgoAPg=",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.0.0"
+      }
+    },
+    "@babel/core": {
+      "version": "7.3.4",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.3.4.tgz",
+      "integrity": "sha1-khpaE3RsIeMkRb8HmGgOnRGmUws=",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/generator": "^7.3.4",
+        "@babel/helpers": "^7.2.0",
+        "@babel/parser": "^7.3.4",
+        "@babel/template": "^7.2.2",
+        "@babel/traverse": "^7.3.4",
+        "@babel/types": "^7.3.4",
+        "convert-source-map": "^1.1.0",
+        "debug": "^4.1.0",
+        "json5": "^2.1.0",
+        "lodash": "^4.17.11",
+        "resolve": "^1.3.2",
+        "semver": "^5.4.1",
+        "source-map": "^0.5.0"
+      }
+    },
+    "@babel/generator": {
+      "version": "7.3.4",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.3.4.tgz",
+      "integrity": "sha1-mqSMGYkleHep2XEpbltzv+cuRG4=",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.3.4",
+        "jsesc": "^2.5.1",
+        "lodash": "^4.17.11",
+        "source-map": "^0.5.0",
+        "trim-right": "^1.0.1"
+      }
+    },
+    "@babel/helper-function-name": {
+      "version": "7.1.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-function-name/-/helper-function-name-7.1.0.tgz",
+      "integrity": "sha1-oM6wFoX3M1XUNgwSR/WCv6/I/1M=",
+      "dev": true,
+      "requires": {
+        "@babel/helper-get-function-arity": "^7.0.0",
+        "@babel/template": "^7.1.0",
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-get-function-arity": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0.tgz",
+      "integrity": "sha1-g1ctQyDipGVyY3NBE8QoaLZOScM=",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helper-plugin-utils": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-plugin-utils/-/helper-plugin-utils-7.0.0.tgz",
+      "integrity": "sha1-u7P77phmHFaQNCN8wDlnupm08lA=",
+      "dev": true
+    },
+    "@babel/helper-split-export-declaration": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0.tgz",
+      "integrity": "sha1-Oq4oXAMRwqsJXZl7jJqUytVH2BM=",
+      "dev": true,
+      "requires": {
+        "@babel/types": "^7.0.0"
+      }
+    },
+    "@babel/helpers": {
+      "version": "7.3.1",
+      "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.3.1.tgz",
+      "integrity": "sha1-lJ7snqS0XTIQ/rfcHCLbZkyeRLk=",
+      "dev": true,
+      "requires": {
+        "@babel/template": "^7.1.2",
+        "@babel/traverse": "^7.1.5",
+        "@babel/types": "^7.3.0"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
+      "integrity": "sha1-9xDDjI1Fjm3ZogGvtjf8t4HOmeQ=",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "@babel/parser": {
+      "version": "7.3.4",
+      "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.3.4.tgz",
+      "integrity": "sha1-pDNX5Lv0uSpDf7nkZcGShIKH8nw=",
+      "dev": true
+    },
+    "@babel/plugin-syntax-object-rest-spread": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/@babel/plugin-syntax-object-rest-spread/-/plugin-syntax-object-rest-spread-7.2.0.tgz",
+      "integrity": "sha1-O3o+czUQxX6CC5FCpleayLDfrS4=",
+      "dev": true,
+      "requires": {
+        "@babel/helper-plugin-utils": "^7.0.0"
+      }
+    },
+    "@babel/template": {
+      "version": "7.2.2",
+      "resolved": "https://registry.npmjs.org/@babel/template/-/template-7.2.2.tgz",
+      "integrity": "sha1-AFs/3w7ZbogEEzA3ng2ppwjrKQc=",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/parser": "^7.2.2",
+        "@babel/types": "^7.2.2"
+      }
+    },
+    "@babel/traverse": {
+      "version": "7.3.4",
+      "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.3.4.tgz",
+      "integrity": "sha1-EzCqtyI0+N6gkbCMT4udBccRngY=",
+      "dev": true,
+      "requires": {
+        "@babel/code-frame": "^7.0.0",
+        "@babel/generator": "^7.3.4",
+        "@babel/helper-function-name": "^7.1.0",
+        "@babel/helper-split-export-declaration": "^7.0.0",
+        "@babel/parser": "^7.3.4",
+        "@babel/types": "^7.3.4",
+        "debug": "^4.1.0",
+        "globals": "^11.1.0",
+        "lodash": "^4.17.11"
+      }
+    },
+    "@babel/types": {
+      "version": "7.3.4",
+      "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.3.4.tgz",
+      "integrity": "sha1-v0gurq/7Nnooq7+TV6lJYyNdkO0=",
+      "dev": true,
+      "requires": {
+        "esutils": "^2.0.2",
+        "lodash": "^4.17.11",
+        "to-fast-properties": "^2.0.0"
+      }
+    },
+    "abab": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/abab/-/abab-2.0.0.tgz",
+      "integrity": "sha1-q6CrTF7uLUx500h9hUUPsjduuw8=",
+      "dev": true
+    },
+    "acorn": {
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.1.1.tgz",
+      "integrity": "sha1-fSWuBbuK0fm2mRCOEJTs14hK3B8=",
+      "dev": true
+    },
+    "acorn-globals": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-4.3.0.tgz",
+      "integrity": "sha1-47b42jwVUqla5idXH33Wkju1QQM=",
+      "dev": true,
+      "requires": {
+        "acorn": "^6.0.1",
+        "acorn-walk": "^6.0.1"
+      }
+    },
+    "acorn-jsx": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.1.tgz",
+      "integrity": "sha1-MqBk/ZJUKSFqCbFBECv90YX65A4=",
+      "dev": true
+    },
+    "acorn-walk": {
+      "version": "6.1.1",
+      "resolved": "https://registry.npmjs.org/acorn-walk/-/acorn-walk-6.1.1.tgz",
+      "integrity": "sha1-02O2b1+sXwGP+cOh57b44xDMORM=",
+      "dev": true
+    },
+    "ajv": {
+      "version": "6.9.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.9.2.tgz",
+      "integrity": "sha1-SSetuD5/SOWjK0Vyl0THHsOcnHs=",
+      "dev": true,
+      "requires": {
+        "fast-deep-equal": "^2.0.1",
+        "fast-json-stable-stringify": "^2.0.0",
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
+      }
+    },
+    "ansi-escapes": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.2.0.tgz",
+      "integrity": "sha1-h4C5j/nb9WOBUtHx/lwde0RCl2s=",
+      "dev": true
+    },
+    "ansi-regex": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
+      "dev": true
+    },
+    "ansi-styles": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha1-QfuyAkPlCxK+DwS43tvwdSDOhB0=",
+      "dev": true,
+      "requires": {
+        "color-convert": "^1.9.0"
+      }
+    },
+    "anymatch": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
+      "integrity": "sha1-vLJLTzeTTZqnrBe0ra+J58du8us=",
+      "dev": true,
+      "requires": {
+        "micromatch": "^3.1.4",
+        "normalize-path": "^2.1.1"
+      }
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+    "append-transform": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-1.0.0.tgz",
+      "integrity": "sha1-BGpSrlgqIovXL1is++KWfGeHWas=",
+      "dev": true,
+      "requires": {
+        "default-require-extensions": "^2.0.0"
+      }
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+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha1-vNZ5HqWuCXJeF+WtmIE0zUCz2RE=",
+      "dev": true,
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
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+    "arr-diff": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
+      "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=",
+      "dev": true
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+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
+      "integrity": "sha1-NgSLv/TntH4TZkQxbJlmnqWukfE=",
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+      "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
+      "dev": true
+    },
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+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/array-equal/-/array-equal-1.0.0.tgz",
+      "integrity": "sha1-jCpe8kcv2ep0KwTHenUJO6J1fJM=",
+      "dev": true
+    },
+    "array-filter": {
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+      "resolved": "https://registry.npmjs.org/array-filter/-/array-filter-0.0.1.tgz",
+      "integrity": "sha1-fajPLiZijtcygDWB/SH2fKzS7uw="
+    },
+    "array-map": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/array-map/-/array-map-0.0.0.tgz",
+      "integrity": "sha1-iKK6tz0c97zVwbEYoAP2b2ZfpmI="
+    },
+    "array-reduce": {
+      "version": "0.0.0",
+      "resolved": "https://registry.npmjs.org/array-reduce/-/array-reduce-0.0.0.tgz",
+      "integrity": "sha1-FziZ0//Rx9k4PkR5Ul2+J4yrXys="
+    },
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+      "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=",
+      "dev": true
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+    "arrify": {
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+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz",
+      "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
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+      "requires": {
+        "safer-buffer": "~2.1.0"
+      }
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+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
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+      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-10.0.1.tgz",
+      "integrity": "sha1-kZaB3AmWFM19MdRciQhpUJKh+u0=",
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+      "requires": {
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+        "@babel/parser": "^7.0.0",
+        "@babel/traverse": "^7.0.0",
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+      "dev": true,
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+      },
+      "dependencies": {
+        "async": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/async/-/async-1.0.0.tgz",
+          "integrity": "sha1-+PwEyjoTeErenhZBr5hXjPvWR6k=",
+          "dev": true
+        },
+        "colors": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/colors/-/colors-1.0.3.tgz",
+          "integrity": "sha1-BDP0TYCWgP3rYO0mDxsMJi6CpAs=",
+          "dev": true
+        },
+        "pkginfo": {
+          "version": "0.3.1",
+          "resolved": "https://registry.npmjs.org/pkginfo/-/pkginfo-0.3.1.tgz",
+          "integrity": "sha1-Wyn2qB9wcXFC4J52W76rl7T4HiE=",
+          "dev": true
+        }
+      }
+    },
+    "wordwrap": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
+      "dev": true
+    },
+    "wrap-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "dev": true,
+      "requires": {
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+          "dev": true
+        },
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "dev": true,
+          "requires": {
+            "number-is-nan": "^1.0.0"
+          }
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "dev": true,
+          "requires": {
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        }
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha1-CADhRSO5I6OH5BUSPIZWFqrg9cM=",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
+    "write-file-atomic": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-2.4.1.tgz",
+      "integrity": "sha1-0LBUY8GIroBDlv1asqNwBir4dSk=",
+      "dev": true,
+      "requires": {
+        "graceful-fs": "^4.1.11",
+        "imurmurhash": "^0.1.4",
+        "signal-exit": "^3.0.2"
+      }
+    },
+    "ws": {
+      "version": "5.2.2",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-5.2.2.tgz",
+      "integrity": "sha1-3/7xSGa46NyRM1glFNG++vlumA8=",
+      "dev": true,
+      "requires": {
+        "async-limiter": "~1.0.0"
+      }
+    },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha1-auc+Bt5NjG5H+fsYH3jWSK1FfGo=",
+      "dev": true
+    },
+    "y18n": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+      "integrity": "sha1-le+U+F7MgdAHwmThkKEg8KPIVms=",
+      "dev": true
+    },
+    "yargs": {
+      "version": "12.0.5",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-12.0.5.tgz",
+      "integrity": "sha1-BfWZe2CWR7ZPZrgeO0sQo2jnrRM=",
+      "dev": true,
+      "requires": {
+        "cliui": "^4.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^3.0.0",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^3.0.0",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^2.0.0",
+        "which-module": "^2.0.0",
+        "y18n": "^3.2.1 || ^4.0.0",
+        "yargs-parser": "^11.1.1"
+      },
+      "dependencies": {
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "dev": true,
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "2.2.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.2.0.tgz",
+          "integrity": "sha512-pZbTJpoUsCzV48Mc9Nh51VbwO0X9cuPFE8gYwx9BTCt9SF8/b7Zljd2fVgOxhIF/HDTKgpVzs+GPhyKfjLLFRQ==",
+          "dev": true,
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "dev": true,
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "p-try": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.0.0.tgz",
+          "integrity": "sha512-hMp0onDKIajHfIkdRk3P4CdCmErkYAxxDtP3Wx/4nZ3aGlau2VKh3mZpcuFkH27WQkL/3WBCPOktzA9ZOAnMQQ==",
+          "dev": true
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "11.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-11.1.1.tgz",
+      "integrity": "sha1-h5oIZZc7yp9rq1y987HGfsfTvPQ=",
+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
index 16782d8..c42e664 100644
--- a/package.json
+++ b/package.json
@@ -12,11 +12,8 @@
   ],
   "main": "index.js",
   "homepage": "https://github.com/vesln/nixt",
-  "directories": {
-    "test": "test"
-  },
   "scripts": {
-    "test": "make test"
+    "test": "jest --bail"
   },
   "repository": {
     "type": "git",
@@ -25,16 +22,16 @@
   "author": "Veselin Todorov <hi@vesln.com>",
   "license": "MIT",
   "devDependencies": {
-    "chai": "*",
-    "hydro": "*",
-    "hydro-dot": "*",
-    "hydro-chai": "*",
-    "hydro-bdd": "*",
-    "prompt": "^0.2.12"
+    "babel-eslint": "^10.0.1",
+    "eslint": "^5.15.0",
+    "eslint-config-airbnb-base": "^13.1.0",
+    "eslint-plugin-import": "^2.16.0",
+    "jest": "^24.1.0",
+    "prompt": "^1.0.0"
   },
   "dependencies": {
-    "assertion-error": "~1.0.0",
-    "clone": "^1.0.2",
+    "assertion-error": "~1.1.0",
+    "clone": "^2.1.2",
     "shell-quote": "^1.4.1"
   }
 }
diff --git a/test/base.test.js b/test/base.test.js
deleted file mode 100644
index d56a3c5..0000000
--- a/test/base.test.js
+++ /dev/null
@@ -1,9 +0,0 @@
-describe('nixt#base', function() {
-  it('sets a base command', function(done) {
-    nfixt()
-    .base('node ')
-    .run('code-0.js')
-    .code(0)
-    .end(done);
-  });
-});
diff --git a/test/code.test.js b/test/code.test.js
deleted file mode 100644
index be29648..0000000
--- a/test/code.test.js
+++ /dev/null
@@ -1,28 +0,0 @@
-describe('nixt#code', function() {
-  it('can verify the exit code of a program', function(done) {
-    nfixt()
-    .run('node code-0.js')
-    .code(0)
-    .end(done);
-  });
-
-  it('returns an error when the exit code does not match the expected one', function(done) {
-    nfixt()
-    .run('node code-0.js')
-    .code(1)
-    .end(function(err) {
-      err.message.should.eq('`node code-0.js`: Expected exit code: "1", actual: "0"');
-      done();
-    });
-  });
-
-  it('returns an error when the nonzero exit code does not match the expected one', function(done) {
-    nfixt()
-    .run('node code-1.js')
-    .code(0)
-    .end(function(err) {
-      err.message.should.eq('`node code-1.js`: Expected exit code: "0", actual: "1"');
-      done();
-    });
-  });
-});
diff --git a/test/colors.test.js b/test/colors.test.js
deleted file mode 100644
index 5754387..0000000
--- a/test/colors.test.js
+++ /dev/null
@@ -1,13 +0,0 @@
-var nixt = require('..');
-var join = require('path').join;
-
-describe('nixt', function() {
-  it('can strip colors from stdout and stderr', function(done) {
-    nixt({ colors: false })
-    .cwd(join(__dirname, 'fixtures'))
-    .run('node colors.js')
-    .stdout('Stdout')
-    .stderr('Stderr')
-    .end(done);
-  });
-});
diff --git a/test/env.test.js b/test/env.test.js
deleted file mode 100644
index 994a6c1..0000000
--- a/test/env.test.js
+++ /dev/null
@@ -1,10 +0,0 @@
-describe('nixt#env', function() {
-  it('sets environemt variables', function(done) {
-    nfixt()
-    .env('HELLO', 'true')
-    .env('BYE', 'true')
-    .run('node env.js')
-    .code(0)
-    .end(done);
-  });
-});
diff --git a/test/exec.test.js b/test/exec.test.js
deleted file mode 100644
index 31954b3..0000000
--- a/test/exec.test.js
+++ /dev/null
@@ -1,30 +0,0 @@
-var fs = require('fs');
-var join = require('path').join;
-var file = join(__dirname, 'tmp', 'writefile-test');
-
-describe('nixt#exec', function() {
-  it('runs the supplied command', function(done) {
-    nfixt()
-    .exec('node ' + join(__dirname, 'fixtures', 'create-file.js'))
-    .run('node writefile.js')
-    .stdout('File exists')
-    .unlink(file)
-    .end(done);
-  });
-
-  it('respects the current working directory', function(done) {
-    var root = join(__dirname, 'tmp');
-    var fixture = join(root, 'foo.tmp.js');
-
-    nfixt()
-    .cwd(root)
-    .exec('touch foo.tmp.js')
-    .run('')
-    .end(function(err) {
-      should.not.exist(err);
-      fs.existsSync(fixture).should.be.true;
-      fs.unlinkSync(fixture);
-      done();
-    })
-  });
-});
diff --git a/test/exist.test.js b/test/exist.test.js
deleted file mode 100644
index fdc086a..0000000
--- a/test/exist.test.js
+++ /dev/null
@@ -1,44 +0,0 @@
-var fs = require('fs');
-var join = require('path').join;
-var file = join(__dirname, 'tmp', 'exists-file-test');
-var dir = join(__dirname, 'tmp', 'exists-dir-test');
-
-describe('nixt#exist', function() {
-  it('can verify that a file exists', function(done) {
-    nfixt()
-    .writeFile(file)
-    .run('node void.js')
-    .exist(file)
-    .unlink(file)
-    .end(done);
-  });
-
-  it('returns an error when the file does not exist', function(done) {
-    nfixt()
-    .run('node void.js')
-    .exist(file)
-    .end(function(err) {
-      (err !== null).should.eq(true);
-      done();
-    });
-  });
-
-  it('can verify that a directory exists', function(done) {
-    nfixt()
-    .mkdir(dir)
-    .run('node void.js')
-    .exist(dir)
-    .rmdir(dir)
-    .end(done);
-  });
-
-  it('returns an error when the directory does not exist', function(done) {
-    nfixt()
-    .run('node void.js')
-    .exist(dir)
-    .end(function(err) {
-      (err !== null).should.eq(true);
-      done();
-    });
-  });
-});
diff --git a/test/filters.test.js b/test/filters.test.js
deleted file mode 100644
index 475eb90..0000000
--- a/test/filters.test.js
+++ /dev/null
@@ -1,39 +0,0 @@
-var fs = require('fs');
-var join = require('path').join;
-
-var file1 = join(__dirname, 'tmp', 'file-1');
-var file2 = join(__dirname, 'tmp', 'file-2');
-
-describe('nixt filters', function() {
-  it('runs the filters in the expected order', function(done) {
-    var before = 0;
-    var after = 0;
-
-    nfixt()
-    .before(function() {
-      before++;
-      fs.writeFileSync(file1, '');
-    })
-    .before(function(next) {
-      before++;
-      fs.existsSync(file1).should.eq(true);
-      fs.writeFile(file2, '', next);
-    })
-    .after(function() {
-      after++;
-      fs.unlinkSync(file1);
-      fs.unlinkSync(file2);
-    })
-    .run('node filters.js')
-    .stdout('Files exist')
-    .end(function() {
-      before.should.eq(2);
-      after.should.eq(1);
-
-      fs.existsSync(file1).should.eq(false);
-      fs.existsSync(file2).should.eq(false);
-
-      done();
-    });
-  });
-});
diff --git a/test/fixtures/create-file.js b/test/fixtures/create-file.js
deleted file mode 100644
index ddbdfce..0000000
--- a/test/fixtures/create-file.js
+++ /dev/null
@@ -1,5 +0,0 @@
-var fs = require('fs');
-var join = require('path').join;
-var file = join(__dirname, '..', 'tmp', 'writefile-test');
-
-fs.writeFileSync(file, '');
diff --git a/test/fixtures/filters.js b/test/fixtures/filters.js
deleted file mode 100644
index 9271dc8..0000000
--- a/test/fixtures/filters.js
+++ /dev/null
@@ -1,11 +0,0 @@
-var fs = require('fs');
-var join = require('path').join;
-
-var file1 = join(__dirname, '..', 'tmp', 'file-1');
-var file2 = join(__dirname, '..', 'tmp', 'file-2');
-
-if (fs.existsSync(file1) && fs.existsSync(file2)) {
-  console.log('Files exist');
-} else {
-  console.log('Files do not exist');
-}
diff --git a/test/fixtures/mkdir.js b/test/fixtures/mkdir.js
deleted file mode 100644
index c7bdaf0..0000000
--- a/test/fixtures/mkdir.js
+++ /dev/null
@@ -1,7 +0,0 @@
-var fs = require('fs');
-var join = require('path').join;
-var dir = join(__dirname, '..', 'tmp', 'mkdir-test');
-
-if (fs.existsSync(dir)) {
-  console.log('Directory exists');
-}
diff --git a/test/fixtures/prompt.js b/test/fixtures/prompt.js
deleted file mode 100644
index c1316fb..0000000
--- a/test/fixtures/prompt.js
+++ /dev/null
@@ -1,10 +0,0 @@
-var prompt = require('prompt');
-
-prompt.colors = false;
-prompt.start();
-
-prompt.get(['first', 'second'], function(err, result) {
-  console.log('Command-line input received:');
-  console.log('  first: ' + result.first);
-  console.log('  second: ' + result.second);
-});
diff --git a/test/fixtures/rev.js b/test/fixtures/rev.js
deleted file mode 100644
index fbe10b7..0000000
--- a/test/fixtures/rev.js
+++ /dev/null
@@ -1,17 +0,0 @@
-var data = '';
-
-process.stdin.on('data', function (chunk) {
-  var lines = (data + chunk).split('\n');
-  data = lines.pop();
-  lines.forEach(printReversed);
-});
-
-process.stdin.on('end', function () {
-  if (data) {
-    printReversed(data);
-  }
-});
-
-function printReversed (line) {
-  console.log(line.split('').reverse().join(''));
-}
diff --git a/test/fixtures/timeout.js b/test/fixtures/timeout.js
deleted file mode 100644
index 55d39d9..0000000
--- a/test/fixtures/timeout.js
+++ /dev/null
@@ -1 +0,0 @@
-setTimeout(function() {}, 10000);
diff --git a/test/fixtures/writefile.js b/test/fixtures/writefile.js
deleted file mode 100644
index 4f15686..0000000
--- a/test/fixtures/writefile.js
+++ /dev/null
@@ -1,7 +0,0 @@
-var fs = require('fs');
-var join = require('path').join;
-var file = join(__dirname, '..', 'tmp', 'writefile-test');
-
-if (fs.existsSync(file)) {
-  console.log('File exists');
-}
diff --git a/test/match.test.js b/test/match.test.js
deleted file mode 100644
index 8eccfde..0000000
--- a/test/match.test.js
+++ /dev/null
@@ -1,34 +0,0 @@
-var join = require('path').join;
-var file = join(__dirname, 'tmp', 'writefile-test');
-
-describe('nixt#match', function() {
-  it('can assert with strings', function(done) {
-    nfixt()
-    .writeFile(file, 'Hello')
-    .run('node void.js')
-    .match(file, 'Hello')
-    .unlink(file)
-    .end(done);
-  });
-
-  it('can assert with regular expressions', function(done) {
-    nfixt()
-    .writeFile(file, 'Hello')
-    .run('node void.js')
-    .match(file, /ello/)
-    .unlink(file)
-    .end(done);
-  });
-
-  it('returns an error when the contents does not match the desired string', function(done) {
-    nfixt()
-    .writeFile(file, 'Hello')
-    .run('node void.js')
-    .match(file, 'Bye')
-    .unlink(file)
-    .end(function(err) {
-      (err !== true).should.eq(true);
-      done();
-    });
-  });
-});
diff --git a/test/mkdir.test.js b/test/mkdir.test.js
deleted file mode 100644
index 5090c9f..0000000
--- a/test/mkdir.test.js
+++ /dev/null
@@ -1,16 +0,0 @@
-var fs = require('fs');
-var join = require('path').join;
-var dir = join(__dirname, 'tmp', 'mkdir-test');
-
-describe('nixt#mkdir', function() {
-  it('creates a new directory', function(done) {
-    nfixt()
-    .mkdir(dir)
-    .run('node mkdir.js')
-    .stdout('Directory exists')
-    .after(function() {
-      fs.rmdirSync(dir);
-    })
-    .end(done);
-  });
-});
diff --git a/test/newlines.test.js b/test/newlines.test.js
deleted file mode 100644
index 17ef906..0000000
--- a/test/newlines.test.js
+++ /dev/null
@@ -1,40 +0,0 @@
-var nixt = require('..');
-var join = require('path').join;
-
-describe('nixt', function() {
-  it('can strip \\n from stdout and stderr', function(done) {
-    nixt({ newlines: false })
-    .cwd(join(__dirname, 'fixtures'))
-    .run('node newlines.js')
-    .stdout('Hello from newlines.js')
-    .stderr('Error from newlines.js')
-    .end(done);
-  });
-  
-  it('can leave \\n in stdout and stderr', function(done) {
-    nixt({ newlines: true })
-    .cwd(join(__dirname, 'fixtures'))
-    .run('node newlines.js')
-    .stdout('Hello \nfrom \nnewlines.js')
-    .stderr('Error \nfrom \nnewlines.js')
-    .end(done);
-  });
-  
-  it('can strip \\r\\n from stdout and stderr', function(done) {
-    nixt({ newlines: false })
-    .cwd(join(__dirname, 'fixtures'))
-    .run('node newlines-crlf.js')
-    .stdout('Hello from newlines-crlf.js')
-    .stderr('Error from newlines-crlf.js')
-    .end(done);
-  });
-  
-  it('can leave \\r\\n in stdout and stderr', function(done) {
-    nixt({ newlines: true })
-    .cwd(join(__dirname, 'fixtures'))
-    .run('node newlines-crlf.js')
-    .stdout('Hello \r\nfrom \r\nnewlines-crlf.js')
-    .stderr('Error \r\nfrom \r\nnewlines-crlf.js')
-    .end(done);
-  });
-});
diff --git a/test/no-command.test.js b/test/no-command.test.js
deleted file mode 100644
index 3cbaa79..0000000
--- a/test/no-command.test.js
+++ /dev/null
@@ -1,9 +0,0 @@
-var nixt = require('..');
-
-describe('nixt#run', function() {
-  it('throws an error when no command is supplied', function() {
-    should.throw(function() {
-      nixt().end(function() {});
-    }, 'Please provide a command to run. Hint: `nixt#run`');
-  });
-});
diff --git a/test/plugin.test.js b/test/plugin.test.js
deleted file mode 100644
index 33a3cf8..0000000
--- a/test/plugin.test.js
+++ /dev/null
@@ -1,20 +0,0 @@
-var nixt = require('..');
-var should = require('chai').should();
-
-describe('nixt.register', function() {
-  it('can register a single function', function() {
-    var fn = function() {};
-    nixt.register('foo', fn);
-    nixt.should.respondTo('foo');
-  });
-
-  it('can register multiple functions at once', function() {
-    var fn = function() {};
-    var fn1 = function() {};
-
-    nixt.register({ baz: fn, bar: fn1 });
-
-    nixt.should.respondTo('baz');
-    nixt.should.respondTo('bar');
-  });
-});
diff --git a/test/prompt.test.js b/test/prompt.test.js
deleted file mode 100644
index 6f76727..0000000
--- a/test/prompt.test.js
+++ /dev/null
@@ -1,23 +0,0 @@
-describe('nixt', function() {
-  it('can respond to prompts ending in a literal string', function(done) {
-    nfixt()
-    .run('node prompt.js')
-    .on('prompt: first: ').respond('first response\n')
-    .on('prompt: second: ').respond('second response\n')
-    .stdout(/first: first response/)
-    .stdout(/second: second response/)
-    .code(0)
-    .end(done);
-  });
-
-  it('can respond to prompts matching an expression', function(done) {
-    nfixt()
-    .run('node prompt.js')
-    .on(/prompt: (.+): $/).respond('first response\n')
-    .on(/prompt: (.+): $/).respond('second response\n')
-    .stdout(/first: first response/)
-    .stdout(/second: second response/)
-    .code(0)
-    .end(done);
-  });
-});
diff --git a/test/rmdir.test.js b/test/rmdir.test.js
deleted file mode 100644
index 28dcbd8..0000000
--- a/test/rmdir.test.js
+++ /dev/null
@@ -1,17 +0,0 @@
-var fs = require('fs');
-var join = require('path').join;
-var dir = join(__dirname, 'tmp', 'mkdir-test');
-
-describe('nixt#rmdir', function() {
-  it('removes a directory', function(done) {
-    nfixt()
-    .mkdir(dir)
-    .run('node mkdir.js')
-    .stdout('Directory exists')
-    .rmdir(dir)
-    .after(function() {
-      fs.existsSync(dir).should.eq(false);
-    })
-    .end(done);
-  });
-});
diff --git a/test/stderr.test.js b/test/stderr.test.js
deleted file mode 100644
index 8bc9ebe..0000000
--- a/test/stderr.test.js
+++ /dev/null
@@ -1,35 +0,0 @@
-describe('nixt#stderr', function() {
-  it('can assert with strings', function(done) {
-    nfixt()
-    .run('node hello-err.js')
-    .stderr('Hello')
-    .end(done);
-  });
-
-  it('returns an error when stderr does not match the desired string', function(done) {
-    nfixt()
-    .run('node hello-err.js')
-    .stderr('Fail')
-    .end(function(err) {
-      err.message.should.eq('`node hello-err.js`: Expected stderr to match "Fail". Actual: "Hello"');
-      done();
-    });
-  });
-
-  it('can assert with regular expressions', function(done) {
-    nfixt()
-    .run('node hello-err.js')
-    .stderr(/Hell/)
-    .end(done);
-  });
-
-  it('returns an error when the regexp does not match the stderr', function(done) {
-    nfixt()
-    .run('node hello-err.js')
-    .stderr(/Fail/)
-    .end(function(err) {
-      err.message.should.eq('`node hello-err.js`: Expected stderr to match "/Fail/". Actual: "Hello"');
-      done();
-    });
-  });
-});
diff --git a/test/stdin.test.js b/test/stdin.test.js
deleted file mode 100644
index 854fe43..0000000
--- a/test/stdin.test.js
+++ /dev/null
@@ -1,24 +0,0 @@
-describe('nixt#stdin', function() {
-  it('no effect if stdin is not used', function(done) {
-    nfixt()
-    .run('node hello.js')
-    .stdout('Hello')
-    .end(done);
-  });
-
-  it('passes given string on stdin', function(done) {
-    nfixt()
-    .stdin('foo\nbar')
-    .run('node rev.js')
-    .stdout('oof\nrab')
-    .end(done);
-  });
-
-  it('does end the input stream', function(done) {
-    nfixt()
-    .stdin('')
-    .run('node rev.js')
-    .stdout('')
-    .end(done);
-  });
-});
diff --git a/test/stdout.test.js b/test/stdout.test.js
deleted file mode 100644
index 0acbdac..0000000
--- a/test/stdout.test.js
+++ /dev/null
@@ -1,35 +0,0 @@
-describe('nixt#stdout', function() {
-  it('can assert with strings', function(done) {
-    nfixt()
-    .run('node hello.js')
-    .stdout('Hello')
-    .end(done);
-  });
-
-  it('returns an error when stdout does not match the desired string', function(done) {
-    nfixt()
-    .run('node hello.js')
-    .stdout('Fail')
-    .end(function(err) {
-      err.message.should.eq('`node hello.js`: Expected stdout to match "Fail". Actual: "Hello"');
-      done();
-    });
-  });
-
-  it('can assert with regular expressions', function(done) {
-    nfixt()
-    .run('node hello.js')
-    .stdout(/Hell/)
-    .end(done);
-  });
-
-  it('returns an error when the regexp does not match the stdout', function(done) {
-    nfixt()
-    .run('node hello.js')
-    .stdout(/Fail/)
-    .end(function(err) {
-      err.message.should.eq('`node hello.js`: Expected stdout to match "/Fail/". Actual: "Hello"');
-      done();
-    });
-  });
-});
diff --git a/test/timeout.test.js b/test/timeout.test.js
deleted file mode 100644
index d82dbef..0000000
--- a/test/timeout.test.js
+++ /dev/null
@@ -1,11 +0,0 @@
-describe('nixt#timeout', function() {
-  it('force quits comamnds that take longer than specified', function(done) {
-    nfixt()
-    .run('node timeout.js')
-    .timeout(100)
-    .end(function(err) {
-      err.message.should.eq('`node timeout.js`: Command execution terminated (timeout)');
-      done();
-    });
-  });
-});
diff --git a/test/unlink.test.js b/test/unlink.test.js
deleted file mode 100644
index 565ffcf..0000000
--- a/test/unlink.test.js
+++ /dev/null
@@ -1,17 +0,0 @@
-var fs = require('fs');
-var join = require('path').join;
-var file = join(__dirname, 'tmp', 'writefile-test');
-
-describe('nixt#unlink', function() {
-  it('removes a file', function(done) {
-    nfixt()
-    .writeFile(file)
-    .run('node writefile.js')
-    .stdout('File exists')
-    .unlink(file)
-    .after(function() {
-      fs.existsSync(file).should.eq(false);
-    })
-    .end(done);
-  });
-});
diff --git a/test/writefile.test.js b/test/writefile.test.js
deleted file mode 100644
index b26cfd1..0000000
--- a/test/writefile.test.js
+++ /dev/null
@@ -1,16 +0,0 @@
-var fs = require('fs');
-var join = require('path').join;
-var file = join(__dirname, 'tmp', 'writefile-test');
-
-describe('nixt#writeFile', function() {
-  it('creates a new file', function(done) {
-    nfixt()
-    .writeFile(file)
-    .run('node writefile.js')
-    .stdout('File exists')
-    .after(function() {
-      fs.unlinkSync(file);
-    })
-    .end(done);
-  });
-});