Increase test coverage

Author: cdce8p

tests/functional/m/match_class_pattern.py

@@ -32,3 +32,9 @@ def f2(x):
         case A(1, x=1): ...  # [multiple-class-sub-patterns]
         case A(1, y=1): ...
         case A(x=1, x=2, x=3): ...  # [multiple-class-sub-patterns]
+
+        # with invalid __match_args__ we can't detect duplicates with positional patterns
+        case D(1, x=1): ...
+
+        # If class name is undefined, we can't get __match_args__
+        case NotDefined(1, x=1): ...  # [undefined-variable]

tests/functional/m/match_class_pattern.txt

@@ -4,3 +4,4 @@ too-many-positional-sub-patterns:25:13:25:20:f1:A excepts 1 positional sub-patte
 too-many-positional-sub-patterns:27:13:27:23:f1:B excepts 2 positional sub-patterns (given 3):INFERENCE
 multiple-class-sub-patterns:32:13:32:22:f2:Multiple sub-patterns for attribute x:INFERENCE
 multiple-class-sub-patterns:34:13:34:29:f2:Multiple sub-patterns for attribute x:INFERENCE
+undefined-variable:40:13:40:23:f2:Undefined variable 'NotDefined':UNDEFINED