期待数组中的项目 [英] Expect item in array

问题描述

我的一个测试期望错误消息文本是多个值之一。由于 getText（）返回一个承诺我不能使用 toContain（） jasmine matcher。以下不起作用，因为量角器（ jasminewd 引擎盖下）无法解决第二部分中的承诺匹配器， toContain（）在这种情况下：

One of my test expects an error message text to be one of multiple values. Since getText() returns a promise I cannot use toContain() jasmine matcher. The following would not work since protractor (jasminewd under-the-hood) would not resolve a promise in the second part of the matcher, toContain() in this case:

expect(["Unknown Error", "Connection Error"]).toContain(page.errorMessage.getText());

问题：有没有办法检查元素是否在带有jasmine +量角器的数组，其中一个元素是一个承诺？

Question: Is there a way to check if an element is in an array with jasmine+protractor where an element is a promise?

换句话说，我正在寻找的倒数toContain（）以便 expect（）隐式解决传入的承诺。

In other words, I'm looking for inverse of toContain() so that the expect() would implicitly resolve the promise passed in.

作为解决方法，我可以使用显式解决承诺然后（）：

As a workaround, I can explicitly resolve the promise with then():

page.errorMessage.getText().then(function (text) {
    expect(["Unknown Error", "Connection Error"]).toContain(text);
});

我不确定这是不是最好的选择。我也可以使用基于第三方的解决方案，如 jasmine-matchers 。

I'm not sure if this is the best option. I would also be okay with a solution based on third-parties like jasmine-matchers.

例如，这种断言存在于Python中：

As an example, this kind of assertion exists in Python:

self.assertIn(1, [1, 2, 3, 4]) 

推荐答案

看起来你需要一个自定义匹配器。取决于您使用的Jasmine版本：

Looks like you need a custom matcher. Depending on the version of Jasmine you are using:

使用Jasmine 1：

this.addMatchers({
    toBeIn: function(expected) {
        var possibilities = Array.isArray(expected) ? expected : [expected];
        return possibilities.indexOf(this.actual) > -1;
    }
});

使用Jasmine 2：

this.addMatchers({
    toBeIn: function(util, customEqualityTesters) {
        return {
            compare: function(actual, expected) {
                var possibilities = Array.isArray(expected) ? expected : [expected];
                var passed = possibilities.indexOf(actual) > -1;

                return {
                    pass: passed,
                    message: 'Expected [' + possibilities.join(', ') + ']' + (passed ? ' not' : '') + ' to contain ' + actual
                };
            }
        };
    }
});

您必须在 beforeEach <中执行此操作/ code>每个描述块的部分将用于。

您的期望看起来像：

expect(page.errorMessage.getText()).toBeIn(["Unknown Error", "Connection Error"]);

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