Fix the scope behavior with indirect fixtures.

AUTHORS

@@ -23,6 +23,7 @@ Andras Tim
 Andrea Cimatoribus
 Andreas Zeidler
 Andrey Paramonov
+Andrzej Klajnert
 Andrzej Ostrowski
 Andy Freeland
 Anthon van der Neut

changelog/570.bugfix.rst

@@ -0,0 +1 @@
+Fix the scope behavior with indirect fixtures.

src/_pytest/fixtures.py

@@ -859,7 +859,7 @@ class FixtureDef:
             if argname != "request":
                 fixturedef.addfinalizer(functools.partial(self.finish, request=request))
 
-        my_cache_key = request.param_index
+        my_cache_key = self.cache_key(request)
         cached_result = getattr(self, "cached_result", None)
         if cached_result is not None:
             result, cache_key, err = cached_result
@@ -877,6 +877,9 @@ class FixtureDef:
         hook = self._fixturemanager.session.gethookproxy(request.node.fspath)
         return hook.pytest_fixture_setup(fixturedef=self, request=request)
 
+    def cache_key(self, request):
+        return request.param_index if not hasattr(request, "param") else request.param
+
     def __repr__(self):
         return "<FixtureDef argname={!r} scope={!r} baseid={!r}>".format(
             self.argname, self.scope, self.baseid
@@ -913,7 +916,7 @@ def pytest_fixture_setup(fixturedef, request):
         kwargs[argname] = result
 
     fixturefunc = resolve_fixture_function(fixturedef, request)
-    my_cache_key = request.param_index
+    my_cache_key = fixturedef.cache_key(request)
     try:
         result = call_fixture_func(fixturefunc, request, kwargs)
     except TEST_OUTCOME:

testing/python/fixtures.py

@@ -449,7 +449,8 @@ class TestFillFixtures:
                 "*ERROR at setup of test_lookup_error*",
                 "  def test_lookup_error(unknown):*",
                 "E       fixture 'unknown' not found",
-                ">       available fixtures:*a_fixture,*b_fixture,*c_fixture,*d_fixture*monkeypatch,*",  # sorted
+                ">       available fixtures:*a_fixture,*b_fixture,*c_fixture,*d_fixture*monkeypatch,*",
+                # sorted
                 ">       use 'py*test --fixtures *' for help on them.",
                 "*1 error*",
             ]
@@ -4009,3 +4010,45 @@ def test_fixture_named_request(testdir):
             "  *test_fixture_named_request.py:5",
         ]
     )
+
+
+def test_indirect_fixture(testdir):
+    testdir.makepyfile(
+        """
+        from collections import Counter
+
+        import pytest
+
+
+        @pytest.fixture(scope="session")
+        def fixture_1(request, count=Counter()):
+            count[request.param] += 1
+            yield count[request.param]
+
+
+        @pytest.fixture(scope="session")
+        def fixture_2(request):
+            yield request.param
+
+
+        scenarios = [
+            ("a", "a1"),
+            ("a", "a2"),
+            ("b", "b1"),
+            ("b", "b2"),
+            ("c", "c1"),
+            ("c", "c2"),
+        ]
+
+
+        @pytest.mark.parametrize(
+            "fixture_1,fixture_2", scenarios, indirect=["fixture_1", "fixture_2"]
+        )
+        def test_it(fixture_1, fixture_2):
+            assert fixture_1 == 1
+            assert fixture_2[1] in ("1", "2")
+
+    """
+    )
+    result = testdir.runpytest()
+    result.assert_outcomes(passed=6)