telling

That would be telling!

意：这是秘密不告诉你!我有件(好)事不告诉你!
例：A:What did she say to you?
她跟你说了些什么?
B: That'd be telling!
不告诉你。
A: What is Murn making in the kitchen?
妈妈在厨房里做什么好吃的?
B: that's tellin's!
那是秘密，不能告诉你!

test

just testing

用;爱卖弄的人在人家纠正自己不正确的概念或错误的知识时，说这话以掩饰自己的无知或愚蠢。
意;我是知道的，只是考考你!
例： A: As You Like It was written by Marlowe.
皆大欢黝是马洛写的。
B: No, it was written by William Shakespeare.
不对，是威廉·莎士比亚写的:
A: Yes, that' s correct; j u st testing ?
对啦，我只是考考你!