单元测试 – “元素(选择器,标签).query(fn)”方法如何在Angular E2E测试中起作用?

在为Angular Scenario Runner编写E2E测试时,我遇到了一个query()方法:

element(selector, label).query(fn)

documentation说:

Executes the function fn(selectedElements, done), where selectedElements are the elements that match the given jQuery selector and done is a function that is called at the end of the fn function. The label is used for test output.

所以我在html页面上为一组按钮写了一个it-case:

it('should display all buttons on page load', function () {
    var buttonText = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0'];
    element('button', 'UI elements').query(function (selectedElements, done) {
        selectedElements.each(function (idx, elm) {
            expect(elm.innerText in buttonText).toEqual(true);
        });
        done();
    });
});

作为测试执行的结果,我收到了10个带有文本的失败expect-clauses的列表:

expected true but was undefined

中间调试显示buttonText条件下的elm.innerText是真实的.

所以我的问题是,出了什么问题?是不正确的使用done()方法?

最佳答案 你不能在element().query()函数中调用expect().

但是你可以做到以下几点

var promise = element('SELECTOR').query(function(selectedElements, done) {
    // We are in JQuery land.
    if (selectedElements < 1) {
      done('ERROR MESSAGE')
    } else {
      done(null, selectedElements[0].innerText)
    }
    // For documentation only.
    // Don't return anything... just continue.
    done()
})
expect(promise).toEqual('i am waiting for you')

您可以将承诺和期望结合到一个电话中.

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