support override of the parametrized fixture on the test level

--HG--
branch : parametrized-fixture-override

_pytest/python.py

@@ -1716,6 +1716,9 @@ class FixtureManager:
                 continue # will raise FixtureLookupError at setup time
             for fixturedef in faclist[-1:]:
                 if fixturedef.params is not None:
+                    func_params = getattr(getattr(metafunc.function, 'parametrize', None), 'args', [[None]])
+                    # skip directly parametrized arguments
+                    if argname not in func_params and argname not in func_params[0]:
                         metafunc.parametrize(argname, fixturedef.params,
                                              indirect=True, scope=fixturedef.scope,
                                              ids=fixturedef.ids)

testing/python/collect.py

@@ -401,6 +401,23 @@ class TestFunction:
         rec.assertoutcome(passed=1)
 
 
+    def test_parametrize_overrides_parametrized_fixture(self, testdir):
+        """Test parametrization when parameter overrides existing parametrized fixture with same name."""
+        testdir.makepyfile("""
+            import pytest
+
+            @pytest.fixture(params=[1, 2])
+            def value(request):
+                return request.param
+
+            @pytest.mark.parametrize('value',
+                                     ['overrided'])
+            def test_overrided_via_param(value):
+                assert value == 'overrided'
+        """)
+        rec = testdir.inline_run()
+        rec.assertoutcome(passed=1)
+
     def test_parametrize_with_mark(selfself, testdir):
         items = testdir.getitems("""
             import pytest