Support for tests created with functools.partial

Fix #811

testing/python/collect.py

@@ -851,3 +851,47 @@ def test_unorderable_types(testdir):
     result = testdir.runpytest()
     assert "TypeError" not in result.stdout.str()
     assert result.ret == 0
+
+
+def test_collect_functools_partial(testdir):
+    """
+    Test that collection of functools.partial object works, and arguments
+    to the wrapped functions are dealt correctly (see #811).
+    """
+    testdir.makepyfile("""
+        import functools
+        import pytest
+
+        @pytest.fixture
+        def fix1():
+            return 'fix1'
+
+        @pytest.fixture
+        def fix2():
+            return 'fix2'
+
+        def check1(i, fix1):
+            assert i == 2
+            assert fix1 == 'fix1'
+
+        def check2(fix1, i):
+            assert i == 2
+            assert fix1 == 'fix1'
+
+        def check3(fix1, i, fix2):
+            assert i == 2
+            assert fix1 == 'fix1'
+            assert fix2 == 'fix2'
+
+        test_ok_1 = functools.partial(check1, i=2)
+        test_ok_2 = functools.partial(check1, i=2, fix1='fix1')
+        test_ok_3 = functools.partial(check1, 2)
+        test_ok_4 = functools.partial(check2, i=2)
+        test_ok_5 = functools.partial(check3, i=2)
+        test_ok_6 = functools.partial(check3, i=2, fix1='fix1')
+
+        test_fail_1 = functools.partial(check2, 2)
+        test_fail_2 = functools.partial(check3, 2)
+    """)
+    result = testdir.inline_run()
+    result.assertoutcome(passed=6, failed=2)