javascript - 在Protractor JS中使用 "invalid selector"时如何解决关于 "if statement"的错误？

Question

我想使用一个不可见的元素作为条件，如果它存在做 X，否则做 Y。

我已经尝试使用这个元素的类作为定位器和 ng-model 以及他的绑定(bind)，但是它们都不起作用:/

请您协助解决这个问题，非常感谢。

这是我有问题的测试用例:

describe('LiveSite Portal - Existing client send new message', function() {

    var msgBox = expect(element(by.css(".final-container")).isPresent()).toBe(true);
    //var msgBox = element.all(by.css('#main_container > main > div > div > section > div.row.cz-content.inner-content.full-height > div > div.action.ng-scope > footer > form > div.row.form-control.textarea-holder.ng-isolate-scope.ng-hide > textarea'));
    var EC = protractor.ExpectedConditions;

    it('LiveSite - Home Page', function() {
       liveSiteHome();
    });

    if (msgBox === false) {

        it('LiveSite Portal - Existing client send new message - Message form', function() {
          browser.wait(EC.visibilityOf(element(by.xpath("//div[@class='actions-row']//a[.='Leave Your Details']"))), 10000);
          element(by.xpath("//div[@class='actions-row']//a[.='Leave Your Details']")).click();
          waitPageToLoad(); 
          expect(element(by.id("new_client_message_message")).isPresent()).toBe(true);
          element(by.css("div.row.mandatory > div.area")).click();
          element(by.id("new_client_message_title")).sendKeys("Automation message");
          element(by.id("new_client_message_message")).sendKeys("I am not logged-in client. Please call me.");
          element(by.id("new_client_message_email")).sendKeys("idanvcita@gmail.com");
        });

        it('LiveSite Portal - Existing client send new message - Welcome back for existing client', function() {
          element(by.id("new_client_message_first_name")).click();
          browser.wait(EC.visibilityOf(element(by.css("span.welcome-back"))), 10000);
          expect(element(by.css("span.welcome-back")).isPresent()).toBe(true);
        });

        it('LiveSite Portal - Existing client send new message - Messeage Sent', function() {
          element(by.name("commit")).click();
          waitPageToLoad(); 
          expect(element(by.css(".final-container")).isPresen()).toBe(true);t
        });

        it('LiveSite Portal - Existing client send new message - Back to home page', function() {
          element(by.css(".standard-button")).click();
          expect(element(by.model("email")).isPresent()).toBe(true);
          browser.driver.sleep(2000);
        });

    } else {

        it('LiveSite Portal - Send new message from the text box - Text Area', function() {
          // expect(element(msgBtn.isPresent()).toBe(true);
          element(by.xpath("//div[@id='main_container']/main/div/div/section/div[2]/div/div[2]/footer/form/div[2]/textarea")).sendKeys("Hello!\nHow are you?\nHave a good day! :)");
        });

        it('LiveSite Portal - Send new message from the text box - Message has been sent', function() {
          element(by.xpath("//div[@id='main_container']//button[.='Send']")).click();
          browser.wait(EC.visibilityOf(element(by.xpath("//div[@id='main_container']//h2[.='Quick conversation']"))), 10000);
          browser.driver.sleep(2000);
        });

    }

});

这是元素 = msgBox:

<a class="btn btn-void btn-with-font-round-icon engage-btn icon-lg brand-theme-before icon-env ng-binding" ng-click="goExternalUrl(contact_url)" ng-bind="truncate(livesite_actions_texts.contact, 22)" title="Leave Your Details">Leave Your Details</a>

这是错误:

c:\automation\tests>protractor conf.js
Using the selenium server at http://localhost:4444/wd/hub
[launcher] Running 1 instances of WebDriver
LiveSite Portal - Existing client send new message
  encountered a declaration exception - fail


Failures:

  1) LiveSite Portal - Existing client send new message encountered a declaratio
n exception
   Message:
     TypeError: Cannot read property 'matchersClass' of null
   Stacktrace:
     TypeError: Cannot read property 'matchersClass' of null
    at promiseMatchers (C:\Users\idan\AppData\Roaming\npm\node_modules\protracto
r\node_modules\jasminewd\index.js:203:38)
    at global.expect (C:\Users\idan\AppData\Roaming\npm\node_modules\protractor\
node_modules\jasminewd\index.js:221:12)
    at [object Object].<anonymous> (c:\automation\tests\msg.js:3:61)
    at [object Object].jasmine.Env.describe_ (C:\Users\idan\AppData\Roaming\npm\
node_modules\protractor\node_modules\minijasminenode\lib\jasmine-1.3.1.js:913:21
)
    at [object Object].jasmine.Env.describe (C:\Users\idan\AppData\Roaming\npm\n
ode_modules\protractor\node_modules\minijasminenode\lib\jasmine-1.3.1.js:898:15)

    at describe (C:\Users\idan\AppData\Roaming\npm\node_modules\protractor\node_
modules\minijasminenode\lib\jasmine-1.3.1.js:658:27)
    at Object.<anonymous> (c:\automation\tests\msg.js:1:63)

Finished in 0.125 seconds
1 test, 1 assertion, 1 failure

[launcher] 0 instance(s) of WebDriver still running
[launcher] chrome #1 failed 1 test(s)
[launcher] overall: 1 failed spec(s)
[launcher] Process exited with error code 1

c:\automation\tests>

Answer 1

这一行:

var msgBox = expect(element(by.css(".final-container")).isPresent()).toBe(true);

发生在任何 it 声明之外。但是所有 Protractor(真正的 webdriver)神奇的 promise 解决方案都发生在为每个 it 创建的 ControlFlow 中。所以，我认为这不会像您预期的那样有效。

第二个:

if (msgBox === false) {

正在检查 expect 的结果，这是一个 Promise(如果有的话)。我非常有信心它不是 bool 值。在任何情况下，您都在尝试更改将执行哪些 it 函数，但这需要执行一些 Protractor 代码，这实际上不会起作用。

您似乎想要检查页面，确定它是哪种“风格”，然后针对不同的风格(有或没有文本框)运行不同的测试。这似乎是一件合理的事情，但我认为 Protractor 没有很好的表达方式。 (我认为很多人会建议您进行设置，以便您的测试知道期望哪种情况，并且它会导致两组代码都执行。这种有条件的方法意味着测试“通过”可能不会已经练习了你所有的代码。)