Use session.config.hook instead of ihook. Fixes #2124

_pytest/fixtures.py

@@ -754,8 +754,8 @@ class FixtureDef:
                 func = self._finalizer.pop()
                 func()
         finally:
-            ihook = self._fixturemanager.session.ihook
+            hook = self._fixturemanager.session.config.hook
-            ihook.pytest_fixture_post_finalizer(fixturedef=self)
+            hook.pytest_fixture_post_finalizer(fixturedef=self)
             # even if finalization fails, we invalidate
             # the cached fixture value
             if hasattr(self, "cached_result"):
@@ -783,8 +783,8 @@ class FixtureDef:
             self.finish()
             assert not hasattr(self, "cached_result")
 
-        ihook = self._fixturemanager.session.ihook
+        hook = self._fixturemanager.session.config.hook
-        return ihook.pytest_fixture_setup(fixturedef=self, request=request)
+        return hook.pytest_fixture_setup(fixturedef=self, request=request)
 
     def __repr__(self):
         return ("<FixtureDef name=%r scope=%r baseid=%r >" %

testing/python/fixture.py

@@ -2984,4 +2984,49 @@ class TestParameterizedSubRequest:
             """.format(fixfile.strpath, testfile.basename))
 
 
+def test_pytest_fixture_setup_hook(testdir):
+    testdir.makeconftest("""
+        import pytest
 
+        def pytest_fixture_setup():
+            print('pytest_fixture_setup hook called')
+    """)
+    testdir.makepyfile("""
+        import pytest
+
+        @pytest.fixture()
+        def some():
+            return 'some'
+
+        def test_func(some):
+            assert some == 'some'
+    """)
+    result = testdir.runpytest("-s")
+    assert result.ret == 0
+    result.stdout.fnmatch_lines([
+        "*pytest_fixture_setup hook called*",
+    ])
+
+
+def test_pytest_fixture_post_finalizer_hook(testdir):
+    testdir.makeconftest("""
+        import pytest
+
+        def pytest_fixture_post_finalizer():
+            print('pytest_fixture_post_finalizer hook called')
+    """)
+    testdir.makepyfile("""
+        import pytest
+
+        @pytest.fixture()
+        def some():
+            return 'some'
+
+        def test_func(some):
+            assert some == 'some'
+    """)
+    result = testdir.runpytest("-s")
+    assert result.ret == 0
+    result.stdout.fnmatch_lines([
+        "*pytest_fixture_post_finalizer hook called*",
+    ])