如何多次调用assert直到它成立？ [英] How to call assert for several time until it's true?

问题描述

说我得到如下一些基本断言：

Say that I got some basic assert as below:

expect（myObject.getValue（））。to.equal（5）;

从 myObject.getValue（）返回的值应为 5 在其他地方运行了几个代码之后，所以我只需要让此值进行更新。

And the returned value from myObject.getValue() should be 5 after several code running over some other place, so I just need to let this value to be updated.

我的问题是，创建这种测试的代码是什么？

My question is, what is the code for creating this kind of test?

推荐答案

Mocha为重试。您可以在测试中使用 this.retries（number_of_tries）。像这样：

Mocha has a facility for retrying tests. You can just use this.retries(number_of_tries) in your test. Like this:

it("something", function () {
    this.retries(10);
    expect(myObject.getValue()).to.equal(5);
});

您也可以在描述中使用它如果要设置整个测试的重试次数，则阻止。请注意，如果使用 this.retries ，则它不会出现在箭头函数中（（）=> ... ），因为箭头函数使 this 保持其在箭头函数出现的范围内的值。您必须使用完整功能（功能（）... ）。

You can also use it in a describe block if you want to set the number of retries for an entire set of tests. Note that if you use this.retries, it cannot appear in an arrow function (() => ...) because arrow functions let this remain the value it had in the scope in which the arrow function appeared. You must use a full function (function () ...).

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