Added Hypothesis support

Fixes agronholm#55.

README.rst

@@ -24,6 +24,11 @@ It bridges the following functionality:
 You can even use it together with native libraries from your selected backend in applications.
 Doing this in libraries is not advisable however since it limits the usefulness of your library.
 
+AnyIO comes with its own pytest_ plugin which also supports asynchronous fixtures.
+It even works with the popular Hypothesis_ library.
+
 .. _asyncio: https://docs.python.org/3/library/asyncio.html
 .. _curio: https://github.com/dabeaz/curio
 .. _trio: https://github.com/python-trio/trio
+.. _pytest: https://docs.pytest.org/en/latest/
+.. _Hypothesis: https://hypothesis.works/

anyio/pytest_plugin.py

@@ -73,9 +73,21 @@ def pytest_generate_tests(metafunc):
 
 @pytest.mark.tryfirst
 def pytest_pyfunc_call(pyfuncitem):
+    def run_with_hypothesis(**kwargs):
+        run(partial(original_func, **kwargs), backend=backend)
+
     if pyfuncitem.get_closest_marker('anyio'):
-        funcargs = pyfuncitem.funcargs
         backend = pyfuncitem._request.getfixturevalue('anyio_backend')
+        if hasattr(pyfuncitem.obj, 'hypothesis'):
+            # Wrap the inner test function unless it's already wrapped
+            original_func = pyfuncitem.obj.hypothesis.inner_test
+            original_func_name = getattr(original_func, '__qualname__', '')
+            if original_func_name != run_with_hypothesis.__qualname__:
+                pyfuncitem.obj.hypothesis.inner_test = run_with_hypothesis
+
+            return False
+
+        funcargs = pyfuncitem.funcargs
         testargs = {arg: funcargs[arg] for arg in pyfuncitem._fixtureinfo.argnames}
         run(partial(pyfuncitem.obj, **testargs), backend=backend)
         return True

docs/versionhistory.rst

@@ -15,6 +15,9 @@ This library adheres to `Semantic Versioning <http://semver.org/>`_.
   cancel scope on asyncio and curio
 - Added the ``current_time()`` function
 - Replaced ``CancelledError`` with ``get_cancelled_exc_class()``
+- Added support for Hypothesis_
+
+.. _Hypothesis: https://hypothesis.works/
 
 **1.0.0rc1**
 

setup.cfg

@@ -31,6 +31,7 @@ install_requires =
 test =
     pytest >= 3.7.2
     pytest-cov
+    hypothesis >= 3.64
 trio = trio >= 0.11
 curio = curio >= 0.9
 doc =

tests/test_hypothesis.py

@@ -0,0 +1,9 @@
+import pytest
+from hypothesis import given
+from hypothesis.strategies import just
+
+
+@pytest.mark.anyio
+@given(x=just(1))
+async def test_hypothesis_wrapper(x):
+    assert isinstance(x, int)