javascript - 使用 should.js 和 Mocha 检查 throw new 错误

Question

我有一个像这样抛出的错误:

if (somethingBadHappened) {
    throw new Error('what were you thinking, batman?')
}

现在我想编写一个测试来检查它是否按预期抛出:

should(MyClass.methodThatShouldThrow()).throws('what were you thinking, batman?')

但这实际上会引发错误。我究竟做错了什么？ Should.js 文档非常简洁，因为它继承自 assert.throws，但即使是它的文档也不能以“should.js”方式工作？

Answer 1

正如您所发现的，您的代码执行了抛出错误的函数并且 should 没有机会捕获它。

要允许正确断言，您需要将函数调用包装在匿名函数中。

should(function ()  {MyClass.methodThatShouldThrow();} ).throw('what were you thinking, batman?')