量角器等待超时捕捉并继续

Question

我在量角器中有一段代码可以等待：

public waitForElement() {
    return browser.wait(
        ExpectedConditions.visibilityOf(element(by.id('#someEl'))),
        10000,
        'Unable to find the element'
        );
}

我的问题是，如果超时，我似乎无法捕获此异常。我尝试添加一个 catch() 子句，但它不起作用，例如：

this.waitForElement()
    .then(() => { /* do something */ })
    .catch(() => { /* handle the error -- this code never happens if there is a timeout!!! */ });

我尝试将代码放在 try-catch 块中，但这也无济于事：

try { this.waitForElement().then(() => { }); }
catch (ex) { /* this exception is never caught, the test just fails!! */ }

我很难过：我怎样才能赶上等待超时并继续测试而不会失败？

Answer 1

我为此创建了一个简单的测试用例，见下文

// conf
exports.config = {
  capabilities: {
    'browserName': 'chrome'
  },

  // Framework to use. Jasmine is recommended.
  framework: 'jasmine',

  // Spec patterns are relative to the current working directory when
  // protractor is called.
  specs: ['example_spec.js'],

  // Options to be passed to Jasmine.
  jasmineNodeOpts: {
    defaultTimeoutInterval: 30000
  },
  allScriptsTimeout: 30000,
};

// Spec
describe('Wait for element', () => {
  it('element will be found', () => {
    browser.get('http://www.angularjs.org');

    waitForElement(element(by.css('.hero')))
      .then(() => {
        console.log('element is found');
      })
      .catch((error) => {
        console.log('error = ', error);
      });
  });
  it('element will NOT be found', () => {
    browser.get('http://www.angularjs.org');

    waitForElement(element(by.css('.heroic')))
      .then(() => {
        console.log('element is found');
      })
      .catch((error) => {
        console.log('element is not found, do something different');
      });
  });
});

function waitForElement(element) {
  return browser.wait(
    ExpectedConditions.visibilityOf(element),
    3000,
    'Unable to find the element'
  );
}

这给了我以下输出

 ~/wswebcreation/contributions/protractor  npm run test.example

> protractor@5.1.2 test.example /Users/wswebcreation/contributions/protractor
> node ./bin/protractor example/conf.js

[10:32:17] I/launcher - Running 1 instances of WebDriver
[10:32:17] I/hosted - Using the selenium server at http://localhost:4444/wd/hub/
Started
element is found .
element is not found, do something different.


2 specs, 0 failures
Finished in 6.917 seconds

[10:32:24] I/launcher - 0 instance(s) of WebDriver still running
[10:32:24] I/launcher - chrome #01 passed

所以看起来它有效

你也可以用你的方法做这样的事情

 ~/wswebcreation/contributions/protractor  npm run test.example

> protractor@5.1.2 test.example /Users/wswebcreation/contributions/protractor
> node ./bin/protractor example/conf.js

[10:32:17] I/launcher - Running 1 instances of WebDriver
[10:32:17] I/hosted - Using the selenium server at http://localhost:4444/wd/hub/
Started
element is found .
element is not found, do something different.


2 specs, 0 failures
Finished in 6.917 seconds

[10:32:24] I/launcher - 0 instance(s) of WebDriver still running
[10:32:24] I/launcher - chrome #01 passed

这使它更加“灵活”，您可以捕获方法中的错误，如果需要，让它在那里失败，否则传递一个可用于进一步操作的布尔值。