量角器期望元素最终存在 [英] Protractor expectation that element is eventually present

问题描述

有没有办法期望元素最终在页面上？例如一种方式

Is there a way to have an expectation that an element is eventually on the page? e.g. a way for

browser.wait(protractor.ExpectedConditions.presenceOf(element(by.partialLinkText('Continue'))), 1000, 'Unable to find continue link');

因期望错误而非超时而失败？基本上是一种方法，在下面的行中有一个 isEventuallyPresent（）而不是 isPresent（）

to fail with an expectation error instead of a timeout? Essentially a way to have a isEventuallyPresent() instead of isPresent() in the line below

expect(element(by.partialLinkText('Continue')).isPresent()).toBe(true);

作为参考，我使用 browser.ignoreSynchronization = true 即使它是一个Angular应用程序，并使用Jasmine（至少目前为止）。

For reference, I'm using browser.ignoreSynchronization = true even though it's an Angular app, and using Jasmine (at least for now).

推荐答案

使用的事实

• browser.wait 返回一个条件函数返回真值后解析的promise，如果它的次数被拒绝则返回out。

• browser.wait returns a promise that is resolved once the condition function returns truthy, or rejected if it times out.

如果 期望 传递承诺，它只在承诺解决时运行期望

If expect is passed a promise, it only runs the expectation when the promise is resolved

你可以创建一个包含对 browser.wait的调用的函数

You can make a function that wraps a call to browser.wait

function eventual(expectedCondition) {
  return browser.wait(expectedCondition, 2000).then(function() {
    return true;
  }, function() {
    return false;
  });
}

然后创建期望

expect(eventual(protractor.ExpectedConditions.presenceOf(element(by.partialLinkText('Continue'))))).toBe(true);

或者，为了使其适用于任何浏览器实例，您可以对Protractor原型进行猴子补丁

Or, to make it work on any browser instance, you can monkey-patch the Protractor prototype

protractor.Protractor.prototype.eventual = function(expectedCondition) {
  return this.wait(expectedCondition, 2000).then(function() {
    return true;
  }, function() {
    return false;
  });
}

可以用作

expect(browser.eventual(protractor.ExpectedConditions.presenceOf(element(by.partialLinkText('Continue'))))).toBe(true);

为避免超时，您必须确保超时传递到浏览器。等待小于Jasmine异步测试超时，指定为 jasmineNodeOpts：{defaultTimeoutInterval：timeout_in_millis} 量角器配置文件

To avoid timeouts, you must make sure that the timeout passed to browser.wait is less than the the Jasmine async test timeout, which is specified as jasmineNodeOpts: {defaultTimeoutInterval: timeout_in_millis} in the protractor configuration file

这篇关于量角器期望元素最终存在的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！