Bug Fix 11456: Duplicated parameters in @pytest.mark.parametrize

testing/acceptance_test.py

@@ -367,6 +367,19 @@ class TestGeneralUsage:
         result = pytester.runpytest(p)
         result.assert_outcomes(failed=0, passed=9)
 
+    def test_direct_addressing_selects_duplicates_2(self, pytester: Pytester) -> None:
+        p = pytester.makepyfile(
+            """
+            import pytest
+
+            @pytest.mark.parametrize("a", [a,b,c,a_1])
+            def test_func(a):
+                pass
+            """
+        )
+        result = pytester.runpytest(p)
+        result.assert_outcomes(failed=0, passed=9)
+
     def test_direct_addressing_notfound(self, pytester: Pytester) -> None:
         p = pytester.makepyfile(
             """