使用should.js和Mocha检查抛出新错误

Question

我有一个错误抛出:

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

现在我想编写一个测试来检查这是否会在预期时抛出:

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

但这实际上抛出了错误.我究竟做错了什么？Should.js文档非常简单,因为它继承自assert.throws,但即使是文档也不能以'should.js'的方式工作？

Answer 1

正如您所发现的那样,您的代码执行了抛出错误should并且没有机会捕获它的函数.

要允许正确的断言,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?')