如何获得量角器可靠的结果? [英] How to have protractor reliable results?

问题描述

我正在使用 Protractor (v 1.3.1) 为我的 Angular 1.2.26 应用程序运行 E2E 测试.

I'm using Protractor (v 1.3.1) to run E2E tests for my Angular 1.2.26 application.

但有时，测试可以，有时则不行.似乎有时检查是在显示更新之前完成的(或类似同步"问题).我尝试了很多选择:

But sometimes, tests are ok, sometimes not. It seems that sometimes the check is done before display is updated (or something like "synchronisation" problem). I try many options :

• 添加browser.driver.sleep指令，
• 使用 browser.executeScript('$.fx.off = true')
禁用效果
• 添加browser.waitForAngular() 说明

• add browser.driver.sleep instructions,
• disable effects with browser.executeScript('$.fx.off = true')
• add browser.waitForAngular() instructions

没有成功.

使用量角器进行可靠的 E2E 测试的最佳实践是什么?

What are the bests practice to have reliables E2E tests with protractor?

JM.

推荐答案

每次遇到类似问题，我都会使用 browser.wait() 和 "预期条件"(在量角器 1.7 中引入).有一组内置的预期条件通常就足够了，但您可以轻松定义自定义预期条件.

Every time I have similar issues, I'm using browser.wait() with "Expected Conditions" (introduced in protractor 1.7). There is a set of built-in expected conditions that is usually enough, but you can easily define your custom expected conditions.

例如，等待一个元素变得可见:

var EC = protractor.ExpectedConditions;
var e = element(by.id('xyz'));

browser.wait(EC.visibilityOf(e), 10000);
expect(e.isDisplayed()).toBeTruthy();

一些注意事项:

• 您可以指定自定义错误消息，以防不满足条件并抛出超时错误，请参阅等待超时错误的自定义消息:

browser.wait(EC.visibilityOf(e), 10000, "Element 'xyz' has not become visible");

您可以将 EC 设置为指向 protractor.ExpectedConditions 的全局可用变量.将此行添加到配置中的 onPrepare():

you can set EC to be a globally available variable pointing to protractor.ExpectedConditions. Add this line to the onPrepare() in your config:

onPrepare: function () {
    global.EC = protractor.ExpectedConditions;
}

作为自定义预期条件的示例，请参阅此答案

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