Merge pull request #3780 from nicoddemus/mock-integration-fix

Fix issue where fixtures would lose the decorated functionality

testing/acceptance_test.py

@@ -1044,3 +1044,10 @@ def test_frame_leak_on_failing_test(testdir):
     )
     result = testdir.runpytest_subprocess()
     result.stdout.fnmatch_lines(["*1 failed, 1 passed in*"])
+
+
+def test_fixture_mock_integration(testdir):
+    """Test that decorators applied to fixture are left working (#3774)"""
+    p = testdir.copy_example("acceptance/fixture_mock_integration.py")
+    result = testdir.runpytest(p)
+    result.stdout.fnmatch_lines("*1 passed*")

testing/example_scripts/acceptance/fixture_mock_integration.py

@@ -0,0 +1,17 @@
+"""Reproduces issue #3774"""
+
+import mock
+
+import pytest
+
+config = {"mykey": "ORIGINAL"}
+
+
+@pytest.fixture(scope="function")
+@mock.patch.dict(config, {"mykey": "MOCKED"})
+def my_fixture():
+    return config["mykey"]
+
+
+def test_foobar(my_fixture):
+    assert my_fixture == "MOCKED"

testing/test_compat.py

@@ -1,8 +1,11 @@
 from __future__ import absolute_import, division, print_function
 import sys
+from functools import wraps
+
+import six
 
 import pytest
-from _pytest.compat import is_generator, get_real_func, safe_getattr
+from _pytest.compat import is_generator, get_real_func, safe_getattr, _PytestWrapper
 from _pytest.outcomes import OutcomeException
 
 
@@ -38,6 +41,33 @@ def test_real_func_loop_limit():
         print(res)
 
 
+def test_get_real_func():
+    """Check that get_real_func correctly unwraps decorators until reaching the real function"""
+
+    def decorator(f):
+        @wraps(f)
+        def inner():
+            pass
+
+        if six.PY2:
+            inner.__wrapped__ = f
+        return inner
+
+    def func():
+        pass
+
+    wrapped_func = decorator(decorator(func))
+    assert get_real_func(wrapped_func) is func
+
+    wrapped_func2 = decorator(decorator(wrapped_func))
+    assert get_real_func(wrapped_func2) is func
+
+    # special case for __pytest_wrapped__ attribute: used to obtain the function up until the point
+    # a function was wrapped by pytest itself
+    wrapped_func2.__pytest_wrapped__ = _PytestWrapper(wrapped_func)
+    assert get_real_func(wrapped_func2) is wrapped_func
+
+
 @pytest.mark.skipif(
     sys.version_info < (3, 4), reason="asyncio available in Python 3.4+"
 )