Reverted leak fixture test.

testing/acceptance_test.py

@@ -1047,6 +1047,51 @@ def test_deferred_hook_checking(testdir):
     result.stdout.fnmatch_lines(["* 1 passed *"])
 
 
+def test_fixture_values_leak(testdir):
+    """Ensure that fixture objects are properly destroyed by the garbage collector at the end of their expected
+    life-times (#2981).
+    """
+    testdir.makepyfile(
+        """
+        import attr
+        import gc
+        import pytest
+        import weakref
+
+        @attr.s
+        class SomeObj(object):
+            name = attr.ib()
+
+        fix_of_test1_ref = None
+        session_ref = None
+
+        @pytest.fixture(scope='session')
+        def session_fix():
+            global session_ref
+            obj = SomeObj(name='session-fixture')
+            session_ref = weakref.ref(obj)
+            return obj
+
+        @pytest.fixture
+        def fix(session_fix):
+            global fix_of_test1_ref
+            obj = SomeObj(name='local-fixture')
+            fix_of_test1_ref = weakref.ref(obj)
+            return obj
+
+        def test1(fix):
+            assert fix_of_test1_ref() is fix
+
+        def test2():
+            gc.collect()
+            # fixture "fix" created during test1 must have been destroyed by now
+            assert fix_of_test1_ref() is None
+    """
+    )
+    result = testdir.runpytest()
+    result.stdout.fnmatch_lines(["* 2 passed *"])
+
+
 def test_fixture_order_respects_scope(testdir):
     """Ensure that fixtures are created according to scope order, regression test for #2405
     """

testing/fixture_values_leak_test.py

@@ -1,53 +0,0 @@
-"""Ensure that fixture objects are properly destroyed by the garbage collector at the end of their expected
-life-times (#2981).
-
-This comes from the old acceptance_test.py::test_fixture_values_leak(testdir):
-This used pytester before but was not working when using pytest_assert_reprcompare
-because pytester tracks hook calls and it would hold a reference (ParsedCall object),
-preventing garbage collection
-
-<ParsedCall 'pytest_assertrepr_compare'(**{
-    'config': <_pytest.config.Config object at 0x0000019C18D1C2B0>,
-    'op': 'is',
-    'left': SomeObj(name='local-fixture'),
-    'right': SomeObj(name='local-fixture')})>
-"""
-import attr
-import gc
-import pytest
-import weakref
-
-
-@attr.s
-class SomeObj(object):
-    name = attr.ib()
-
-
-fix_of_test1_ref = None
-session_ref = None
-
-
-@pytest.fixture(scope="session")
-def session_fix():
-    global session_ref
-    obj = SomeObj(name="session-fixture")
-    session_ref = weakref.ref(obj)
-    return obj
-
-
-@pytest.fixture
-def fix(session_fix):
-    global fix_of_test1_ref
-    obj = SomeObj(name="local-fixture")
-    fix_of_test1_ref = weakref.ref(obj)
-    return obj
-
-
-def test1(fix):
-    assert fix_of_test1_ref() is fix
-
-
-def test2():
-    gc.collect()
-    # fixture "fix" created during test1 must have been destroyed by now
-    assert fix_of_test1_ref() is None