Implement Trio mode

Fixes gh-9
Documentation in gh-47

pytest_trio/_tests/test_hypothesis_interaction.py

@@ -1,9 +1,10 @@
 import pytest
 from hypothesis import given, settings, strategies as st
 
-# To avoid unpredictable warnings/errors when CI happens to be slow
-# Example: https://travis-ci.org/python-trio/pytest-trio/jobs/406738296
-our_settings = settings(deadline=None)
+# deadline=None avoids unpredictable warnings/errors when CI happens to be
+# slow (example: https://travis-ci.org/python-trio/pytest-trio/jobs/406738296)
+# max_examples=5 speeds things up a bit
+our_settings = settings(deadline=None, max_examples=5)
 
 
 @our_settings

pytest_trio/_tests/test_trio_mode.py

@@ -0,0 +1,45 @@
+import pytest
+
+
+test_text = """
+import pytest
+import trio
+from hypothesis import given, settings, strategies
+
+async def test_pass():
+    await trio.sleep(0)
+
+async def test_fail():
+    await trio.sleep(0)
+    assert False
+
+@settings(deadline=None, max_examples=5)
+@given(strategies.binary())
+async def test_hypothesis_pass(b):
+    await trio.sleep(0)
+    assert isinstance(b, bytes)
+
+@settings(deadline=None, max_examples=5)
+@given(strategies.binary())
+async def test_hypothesis_fail(b):
+    await trio.sleep(0)
+    assert isinstance(b, int)
+"""
+
+
+def test_trio_mode_pytest_ini(testdir):
+    testdir.makepyfile(test_text)
+
+    testdir.makefile(".ini", pytest="[pytest]\ntrio_mode = true\n")
+
+    result = testdir.runpytest()
+    result.assert_outcomes(passed=2, failed=2)
+
+
+def test_trio_mode_conftest(testdir):
+    testdir.makepyfile(test_text)
+
+    testdir.makeconftest("from pytest_trio.enable_trio_mode import *")
+
+    result = testdir.runpytest()
+    result.assert_outcomes(passed=2, failed=2)

pytest_trio/enable_trio_mode.py

@@ -0,0 +1,7 @@
+__all__ = ["pytest_collection_modifyitems"]
+
+from .plugin import automark
+
+
+def pytest_collection_modifyitems(items):
+    automark(items)

pytest_trio/plugin.py

@@ -20,6 +20,15 @@
     ORDERED_DICTS = False
 
 
+def pytest_addoption(parser):
+    parser.addini(
+        "trio_mode",
+        "should pytest-trio handle all async functions?",
+        type="bool",
+        default=False,
+    )
+
+
 def pytest_configure(config):
     # So that it shows up in 'pytest --markers' output:
     config.addinivalue_line(
@@ -264,6 +273,26 @@ def pytest_fixture_setup(fixturedef, request):
         return _install_async_fixture_if_needed(fixturedef, request)
 
 
+################################################################
+# Trio mode
+################################################################
+
+
+def automark(items):
+    for item in items:
+        if hasattr(item.obj, "hypothesis"):
+            test_func = item.obj.hypothesis.inner_test
+        else:
+            test_func = item.obj
+        if iscoroutinefunction(test_func):
+            item.add_marker(pytest.mark.trio)
+
+
+def pytest_collection_modifyitems(config, items):
+    if config.getini("trio_mode"):
+        automark(items)
+
+
 ################################################################
 # Built-in fixtures
 ################################################################