截取测试失败+例外情况的截图

Question

你们有没有人知道在测试失败和例外情况下截图的可能解决方案？

我已经添加了以下代码,TearDown()但因此它也会对通过的测试进行截图,因此它不是最佳解决方案:

DateTime time = DateTime.Now;
string dateToday = "_date_" + time.ToString("yyyy-MM-dd") + "_time_" + time.ToString("HH-mm-ss");
Screenshot screenshot = ((ITakesScreenshot)driver).GetScreenshot();
screenshot.SaveAsFile((settings.filePathForScreenShots + "Exception" + dateToday + ".png"), System.Drawing.Imaging.ImageFormat.Png);

我已经找到了这个想法:http://yizeng.me/2014/02/08/take-a-screenshot-on-exception-with-selenium-csharp-eventfiringwebdriver/,使用WebDriverExceptionEventArgs,但由于某些原因,它使还有一些随机的截图,没有任何合理的解释.

我发现的其他想法是针对Java的,而不是我用于Selenium的NUnit,所以它们都没用.

Answer 1

如果将屏幕截图逻辑放在TearDown方法中,则会在每次测试完成后调用它,无论它是成功还是失败.

我使用一个基类,它具有包装测试的函数并捕获所有异常.当测试失败时,将捕获异常并截取屏幕截图.

我在所有的Selenium测试中使用这个基类,它看起来像这样:

public class PageTestBase
{
    protected IWebDriver Driver;

    protected void UITest(Action action)
    {
        try
        {
            action();
        }
        catch (Exception ex)
        {
            var screenshot = Driver.TakeScreenshot();

            var filePath = "<some appropriate file path goes here>";

            screenshot.SaveAsFile(filePath, ImageFormat.Png);

            // This would be a good place to log the exception message and
            // save together with the screenshot

            throw;
        }
    }
}

测试类看起来像这样:

[TestFixture]
public class FooBarTests : PageTestBase
{
    // Make sure to initialize the driver in the constructor or SetUp method,
    // depending on your preferences

    [Test]
    public void Some_test_name_goes_here()
    {
        UITest(() =>
        {
            // Do your test steps here, including asserts etc.
            // Any exceptions will be caught by the base class
            // and screenshots will be taken
        });
    }

    [TearDown]
    public void TearDown()
    {
        // Close and dispose the driver
    }
}

Answer 2

在C#中我使用NUnit 3.4.这提供了OneTimeTearDown能够访问TestContext包括先前执行的测试的状态的方法.不要使用,TearDown因为它在测试失败后没有执行;)

using OpenQA.Selenium;
using System.Drawing.Imaging;

...

[OneTimeTearDown]
public void OneTimeTearDown()
{
    if (TestContext.CurrentContext.Result.Outcome != ResultState.Success)
    {
        var screenshot = ((ITakesScreenshot)driver).GetScreenshot();
        screenshot.SaveAsFile(@"C:\TEMP\Screenshot.jpg", ImageFormat.Jpeg);
    }
}

Answer 3

为了更加公正，这里是 MSTest 的代码

public TestContext TestContext { get; set; }

[TestCleanup]
public void TestCleanup()
{
  if (TestContext.CurrentTestOutcome == UnitTestOutcome.Failed)
  {
    var screenshotPath = $"{DateTime.Now:yyyy-MM-dd_HH-mm-ss.fffff}.png";
    MyDriverInstance.TakeScreenshot().SaveAsFile(screenshotPath);
    TestContext.AddResultFile(screenshotPath);
  }
}