test: cover compatibility method return success

tests/test_validate_typecheck_diagnostics.py

@@ -60,6 +60,9 @@ class ValidateTypecheckDiagnosticsTests(unittest.TestCase):
         self.assertIn("tests/typecheck_method_return_expression_bad.claro", MODULE.EXPECTED)
         self.assertIn("tests/typecheck_method_return_expression_good.claro", MODULE.EXPECTED_OK)
 
+    def test_includes_compatibility_method_return_success_fixture(self):
+        self.assertIn("tests/typecheck_method_compat_return_good.claro", MODULE.EXPECTED_OK)
+
 
 if __name__ == "__main__":
     unittest.main()

tests/typecheck_method_compat_return_good.claro

@@ -0,0 +1,9 @@
+CLASS Player
+    TEACH score TAKES amount RETURNS NUMBER
+        CHECK TYPE amount IS NUMBER
+        RETURN amount
+    LEARNED
+ENDCLASS
+
+NEW Player player
+CALL player.score WITH 4