An error could occur in the first test and prevent the variable's value from being set, thus resulting in the other tests receiving a null value.

错误可以发生在首个测试期间，并阻止您去设置变量的值，并导致其他的测试接受一个空值。

youdao

In that case, get returns null, making it even more important than usual to test the return value of get for null.

在这种情况下，get返回null，这使得测试get的返回值是否为null变得比平时更重要了。

youdao

To test your null hypothesis, you want to know the probability of obtaining a value this extreme under the assumption that it is due to random sampling variability.

要检验虚假设，需要知道在假设存在随机抽样可变性的情况下获得这么一个极限值的概率。

youdao