Question

我正在React-Native项目上运行排毒，并且只能测试启动屏幕。初始屏幕转到登录屏幕，但排毒代码不允许我测试此元素。

测试代码：

describe('Splash', () => {
  beforeEach(async () => {
    await device.reloadReactNative();
  });

  it('should have splash screen', async () => {
    await expect(element(by.id('splash'))).toBeVisible();
    await expect(element(by.id('login'))).toBeVisible();
  });
});

给出错误：

● Splash › should have splash screen

    Failed: [Error: Error: Cannot find UI Element.
    Exception with Assertion: {
      "Assertion Criteria":  "assertWithMatcher:matcherForSufficientlyVisible(>=0.750000)",
      "Element Matcher":  "((!(kindOfClass('RCTScrollView')) && (respondsToSelector(accessibilityIdentifier) && accessibilityID('login'))) || (((kindOfClass('UIView') || respondsToSelector(accessibilityContainer)) && parentThatMatches(kindOfClass('RCTScrollView'))) && ((kindOfClass('UIView') || respondsToSelector(accessibilityContainer)) && parentThatMatches((respondsToSelector(accessibilityIdentifier) && accessibilityID('login'))))))",
      "Recovery Suggestion":  "Check if the element exists in the UI hierarchy printed below. If it exists, adjust the matcher so that it accurately matches element."
    }


    Error Trace: [
      {
        "Description":  "Interaction cannot continue because the desired element was not found.",
        "Error Domain":  "com.google.earlgrey.ElementInteractionErrorDomain",
        "Error Code":  "0",
        "File Name":  "GREYElementInteraction.m",
        "Function Name":  "-[GREYElementInteraction matchedElementsWithTimeout:error:]",
        "Line":  "124"
      }
    ]

运行不测试登录组件时，第一个测试通过

Answer 1

需要时间项目才能在屏幕上呈现。您可以使用排毒提供的waitFor属性。

在大多数情况下，测试应与应用程序自动同步。当同步不起作用时，您可以使用waitFor进行故障保护。

您可以在documentation中阅读有关使用waitFor的更多信息。

注意：每个waitFor调用必须使用withTimeout（）设置超时。调用waitFor而不设置超时将无济于事。

注意：到达超时时，waitFor不会抛出，而是继续到下一行。为了确保您的测试能够按预期工作，请在以下行中添加Expect（）。

因此，根据文档中的示例，您应该将测试更新为

it('should show login screen', async () => {
  await expect(element(by.id('splash'))).toBeVisible()
  await waitFor(element(by.id('login'))).toBeVisible().withTimeout(2000);
  await expect(element(by.id('login'))).toBeVisible()
});

仅排毒测试开机画面

1 个答案: