validate idiom examples in test

tests/test_verifier_integration.py

@@ -12,14 +12,11 @@ from singletons import CC_DICT
         ("画蛇添足", True),
         ("自相矛盾", True),
 
-        # CC-CEDICT idioms
-        ("一成不变", True),
-        ("铁面无私", True),
-        ("德才兼备", True),
+        # CC-CEDICT but not in ChiD
+        ("众志成城", True),
 
         # Wiktionary-only
-        ("临危不惧", True),
-        ("心旷神怡", True),
+        ("临危不乱", True),
 
         # Nonexistent idiom
         ("完全不存在的成语", False),