单元测试 - 如何测试返回随机输出的函数? [英] Unit testing - how do I test a function that returns random output?

问题描述

我有一个函数，它接受两个参数，并在 50% 的时间内返回一个或另一个.

I have a function which takes in two parameters, and returns one or the other 50% of the time.

对此的单元测试应确定可以返回两个参数.幸运的是，我不需要证明每个参数的概率是 50%，但我确实需要证明两个参数都可以返回.

The unit test for this should determine that both parameters could be returned. Luckily, I don't need to prove that the probability for each is 50% but I do need to show that both parameters are possible to be returned.

如何为这个函数编写测试用例?

How do I write a test case for this function?

推荐答案

如果随机性是基于它调用的随机数生成器，您可以装配一个存根 random() 函数，该函数返回各种结果，为您提供预期的结果输出.

If the randomness is based on a random number generator that it calls, you can rig up a stub random() function that returns various results to give you your expected outputs.

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