Add test case for skipped multi-assignments [unnecessary-lambda-assignment]

Author: cdce8p

tests/functional/u/unnecessary/unnecessary_lambda_assignment.py

@@ -36,3 +36,7 @@
 # Flag lambda expression assignments via named expressions as well.
 if (e := lambda: 2) and e():  # [unnecessary-lambda-assignment]
     pass
+
+# Skip checking multi-assignments
+a = b = lambda: None
+a, b = x = lambda: None, None