diff --git a/.gitignore b/.gitignore
index 528499d2..814c3c83 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 # Unit tests
 /tmp
 /tests/bin/tmp
+.phpunit.cache
 
 # Numerous always-ignore extensions
 .diff
diff --git a/tests/TestCase.php b/tests/TestCase.php
new file mode 100644
index 00000000..502039f3
--- /dev/null
+++ b/tests/TestCase.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Plausible\Analytics\Tests;
+
+use Yoast\WPTestUtils\BrainMonkey\TestCase as YoastTestCase;
+
+class TestCase extends YoastTestCase {
+	public function __construct() {
+		/**
+		 * During local unit testing this constant is required.
+		 */
+		if ( ! defined( 'ABSPATH' ) ) {
+			define( 'ABSPATH', true );
+		}
+
+		/**
+		 * Required for loading assets.
+		 */
+		if ( ! defined( 'PLAUSIBLE_TESTS_ROOT' ) ) {
+			define( 'PLAUSIBLE_TESTS_ROOT', __DIR__ . '/' );
+		}
+
+		parent::__construct();
+	}
+}
diff --git a/tests/integration/PluginTest.php b/tests/integration/PluginTest.php
new file mode 100644
index 00000000..655af160
--- /dev/null
+++ b/tests/integration/PluginTest.php
@@ -0,0 +1,31 @@
+<?php
+/**
+ * @package Plausible Analytics Integration Tests - Plugin
+ */
+
+namespace Plausible\Analytics\Tests\Integration;
+
+use Plausible\Analytics\Tests\TestCase;
+use Plausible\Analytics\WP\Plugin;
+
+class PluginTest extends TestCase {
+	/**
+	 *
+	 */
+	public function testRegister() {
+		$class = new Plugin();
+		$class->register();
+
+		do_action( 'plugins_loaded' );
+
+		$this->assertTrue( class_exists( '\Plausible\Analytics\WP\Setup' ) );
+
+		define( 'WP_ADMIN', true );
+
+		$class->register();
+
+		do_action( 'plugins_loaded' );
+
+		$this->assertTrue( class_exists( '\Plausible\Analytics\WP\Admin\SelfHosted' ) );
+	}
+}