测试JS异常与Mocha / Chai [英] Testing JS exceptions with Mocha/Chai

问题描述

尝试测试一些代码，在Mocha / Chai抛出异常，但没有运气，这里是我想测试的简单代码：

  class window.VisualizationsManager 
 
 test： - > 
 throw（new Error'Oh no'）
  

这是我的测试：

  describe'VisualizationsManager'， - > 
 
 it'不允许构建新实例'， - > 
 
 manager = new window.VisualizationsManager 
 
 chai.expect（manager.test（））to.throw（'Oh no'）
  
 
 
 
但是，当我运行规范时，测试失败并抛出异常。
 失败/错误：Oh no 
  
错误在这里？
解决方案
这可能是因为你正在执行的函数，所以测试框架不能处理的错误。 p> 
 
 
尝试类似：
  chai.expect（manager.test.bind （经理））to.throw（'哦no'）
  
如果你知道你' t使用函数中的 this 关键字，我猜你也可以不通过绑定传递 manager.test  p> 
 
 
此外，您的测试名称并不反映代码的作用。如果它不允许新实例的构造， manager = new window.VisualizationsManager 应该失败。
 
Trying to test some code that throws an exception with Mocha/Chai, but having no luck, here's the simple code I'm trying to test:
class window.VisualizationsManager

  test: ->
    throw(new Error 'Oh no')
Here is my test:
describe 'VisualizationsManager', ->

  it 'does not permit the construction of new instances', ->

    manager = new window.VisualizationsManager

    chai.expect(manager.test()).to.throw('Oh no')
However, when I run the spec, the test fails and throws the exception.
Failure/Error: Oh no
what am I doing wrong here?
解决方案
It's probably because you are executing the function right away, so the test framework cannot handle the error.

Try something like:
chai.expect(manager.test.bind(manager)).to.throw('Oh no')
If you know that you aren't using the this keyword inside the function I guess you could also just pass manager.test without binding it.

Also, your test name doesn't reflect what the code does. If it doesn't permet the construction of new instances, manager = new window.VisualizationsManager should fail.

                        
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