javascript - 简单测试但定位器无效 :-(

Question

我有这个测试:

// import {by, element, browser} from "protractor";
describe('intro', () => {
  beforeEach(() => {
    browser.get('');
  });

it('should have multiple pages', () => {
    let buttonOnward = element(by.linkText('Continue'));
    expect(element.all(buttonOnward).count()).toBe(1);
  });
});

得到这个结果。

1) intro should have multiple pages
  Message:
    Failed: Invalid locator
  Stack:
    TypeError: Invalid locator
        at Object.check [as checkedLocator] (C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\selenium-webdriver\lib\by.js:267:9)
        at WebDriver.findElements (C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\selenium-webdriver\lib\webdriver.js:919:18)
        at C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\built\element.js:161:44
        at ManagedPromise.invokeCallback_ (C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\selenium-webdriver\lib\promise.js:1379:14)
        at TaskQueue.execute_ (C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\selenium-webdriver\lib\promise.js:2913:14)
        at TaskQueue.executeNext_ (C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\selenium-webdriver\lib\promise.js:2896:21)
        at asyncRun (C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\selenium-webdriver\lib\promise.js:2775:27)
        at C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\selenium-webdriver\lib\promise.js:639:7
        at process._tickCallback (internal/process/next_tick.js:103:7)
    From: Task: Run it("should have multiple pages") in control flow
        at Object.<anonymous> (C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\jasminewd2\index.js:79:14)
        at C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\jasminewd2\index.js:16:5
        at ManagedPromise.invokeCallback_ (C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\selenium-webdriver\lib\promise.js:1379:14)
        at TaskQueue.execute_ (C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\selenium-webdriver\lib\promise.js:2913:14)
        at TaskQueue.executeNext_ (C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\selenium-webdriver\lib\promise.js:2896:21)
        at asyncRun (C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\selenium-webdriver\lib\promise.js:2775:27)
    From asynchronous test:
    Error
        at Suite.describe (C:\xampp\htdocs\test\intro_spec.ts:11:3)
        at Object.<anonymous> (C:\xampp\htdocs\test\intro_spec.ts:2:1)
        at Module._compile (module.js:556:32)
        at Object.Module._extensions..js (module.js:565:10)
        at Module.load (module.js:473:32)
        at tryModuleLoad (module.js:432:12)

1 spec, 1 failure

我也不知道为什么。它真的很简单。我下载了 Jasmine 的类型并检查了这个文件 C:\Users\Patrick\AppData\Roaming\npm\node_modules\protractor\node_modules\selenium-webdriver\lib\by.js。

为其定义了一个函数:

并且文档说该函数也存在。

http://www.protractortest.org/#/api?view=ProtractorBy.prototype.buttonText

$ protractor --version
Version 4.0.9
$ npm -v
3.10.8
$ node -v
v6.7.0

提前感谢您的想法!

Answer 1

进一步扩展@Gunderson 的回答。主要问题是您使用的是 ElementFinder(element() 调用的结果)而不是 by 定位器。查看 buttonOnward 是如何定义的:

let buttonOnward = element(by.linkText('Continue'));

现在，您正在使用 buttonOnward，它现在是 ElementFinder 代替定位器:

expect(element.all(buttonOnward).count()).toBe(1);

可以理解，这会导致“无效定位器”错误。

---

您的意思是改用“by”定位符:

expect(element.all(by.linkText('Continue')).count()).toBe(1);