Javascript 如何使用Jasmine断言异常？

我正在尝试编写一个测试，以确保我正在执行的无效实例化产生异常。测试如下：

describe('Dialog Spec', function () {
"use strict";

it("should throw an exception if called without a container element", function () {
    expect(function() {
        new Dialog({});
    }).toThrow(new Exception("InvalidArgumentException", "Expected container element missing"));
  });
});

Dialog（）类：

我在《茉莉花》中失败了

Expected function to throw Exception InvalidArgumentException: Expected container element missing , but it threw Exception InvalidArgumentException: Expected container element missing

我的例外类：

function Exception(exceptionName, exceptionMessage) {

    var name = exceptionName;
    var message = exceptionMessage;

    this.toString = function () {
        return "Exception " + name + ": "+ message;
    };
}

---

我做错了什么？

我会把它分成多个测试

describe("creating a new `Dialog` without a container element", function() {

    it("should throw an exception", function () {
        expect(function() {
            new Dialog({});
        }).toThrow(new Exception("InvalidArgumentException", "Expected container element missing"));
    });

    describe("the thrown exception", function() {

        it("should give a `InvalidArgumentException: Expected container element missing` message", function () {
            try {
                new Dialog({});
                expect(false).toBe(true); // force the text to fail if an exception isn't thrown.
            }
            catch(e) {
                expect(e.toString()).toEqual("InvalidArgumentException: Expected container element missing");
            }
        });

    });

});

---

exception的断言仅在与Javascript内置错误类实例一起使用时有效。我使用自己定义的Exception（）类，这就是问题的原因

第二个测试的问题是

expect

在catch块中。如果在调用

newdialog（{}）

时更改了代码并且没有引发异常，那么即使功能已中断，测试也将通过！这就是为什么会有第一个测试，@VarunAchar

describe("creating a new `Dialog` without a container element", function() {

    it("should throw an exception", function () {
        expect(function() {
            new Dialog({});
        }).toThrow(new Exception("InvalidArgumentException", "Expected container element missing"));
    });

    describe("the thrown exception", function() {

        it("should give a `InvalidArgumentException: Expected container element missing` message", function () {
            try {
                new Dialog({});
                expect(false).toBe(true); // force the text to fail if an exception isn't thrown.
            }
            catch(e) {
                expect(e.toString()).toEqual("InvalidArgumentException: Expected container element missing");
            }
        });

    });

});