fix: Restores accidentally deleted test case

Author: Daverball

tests/test_tc008.py

@@ -16,6 +16,8 @@
 examples = [
     ('', set()),
     ("x: TypeAlias = 'int'", {'1:15 ' + TC008.format(alias='int')}),
+    # this should emit a TC010 instead
+    ("x: TypeAlias = 'int' | None", set()),
     # this used to emit an error before fixing #164 if we wanted to handle
     # this case once again we could add a whitelist of subscriptable types
     ("x: TypeAlias = 'Dict[int]'", set()),