使用自定义匹配器的 jasmine 2.0 测试失败:未定义不是函数

2022-01-11 00:00:00 jasmine javascript

我的源文件中有这个函数:

I have this function in my source file:

function gimmeANumber(){
    var x = 4;
    return x;
}

以及从本教程

describe('Hello world', function() {

    beforeEach(function() {
        this.addMatchers({
            toBeDivisibleByTwo: function() {
                return (this.actual % 2) === 0;
            }
        });
    });

    it('is divisible by 2', function() {
        expect(gimmeANumber()).toBeDivisibleByTwo();
    });

});

这是错误:

TypeError: undefined is not a function在对象.(file:///home/n/foo/jasmine/jasmine-2.0.0/dist/spec/HelloWorldSpec.js...)谢谢.

TypeError: undefined is not a function at Object. (file:///home/n/foo/jasmine/jasmine-2.0.0/dist/spec/HelloWorldSpec.js...) Thank you.

推荐答案

从 1.3 开始，添加自定义匹配器的 API 发生了变化.您可以在此处查看更改.

The API for adding custom matchers has changed since 1.3. You can see the changes here.

这里是它现在的工作方式:

function gimmeANumber() {
    var x = 4;
    return x;
}

describe('Hello world', function () {

    beforeEach(function () {
        jasmine.addMatchers({
            toBeDivisibleByTwo: function () {
                return {
                    compare: function (actual, expected) {
                        return {
                            pass: (actual % 2) === 0
                        };
                    }
                };
            }
        });
    });

    it('is divisible by 2', function () {
        expect(gimmeANumber()).toBeDivisibleByTwo();
        expect(5).not.toBeDivisibleByTwo();
    });

});

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