如何测试参数化方法是否会抛出chai和mocha？

Question

I have this (simplified) code to test:

function verifyArg(x) {
  if (x == 400) throw new Error("Bad Parameter!")
}

How do I test if the error is thrown correctly with mocha and chai?

Answer 1

I found the answer myself:

describe("verify()", function() {
   it("throws on 400", function() {
      expect(function() {
         verify(400);
      }).not.to.throw();
   });
});

callback hell ftw!