Code examples for post: SpecFlow Tips: Collect more information on error (part 1)

AfterScenarioOnError.cs

[AfterScenario]
public void OnError()
{
  if (ScenarioContext.Current.TestError != null)
  {
    //TODO: save useful information to a file
  }
}

AfterStepOnError.cs

[AfterStep]
public void OnError()
{
    if (ScenarioContext.Current.TestError != null)
    {
        var stepInfo = ScenarioContext.Current.StepContext.StepInfo;
        var stepDescription = stepInfo.StepDefinitionType + stepInfo.Text;
        // ...
    }
}

SaveScreenshotOnError.cs

[AfterScenario]
public void OnError()
{
  if (ScenarioContext.Current.TestError != null)
  {
    // get and save a screenshot from a webdriver
    var takesScreenshot = myWebDriver as ITakesScreenshot;
    if (takesScreenshot != null)
    {
      string screenshotFileName = ToPath(string.Format("{0}_{1}_{2}.png",
        FeatureContext.Current.FeatureInfo.Title,
        ScenarioContext.Current.ScenarioInfo.Title,
        DateTime.Now.ToString("s")));
      
      string screenshotFilePath = TestFolders.GetOutputFilePath(screenshotFileName);
      
      var screenshot = takesScreenshot.GetScreenshot();
      screenshot.SaveAsFile(screenshotFilePath, ImageFormat.Png);
      Console.WriteLine("Screenshot: {0}", new Uri(screenshotFilePath));
    }
  }
}

ToPath.cs

/// <summary>
/// Makes string path-compatible, ie removes characters not allowed in path and replaces whitespace with '_'
/// </summary>
public static string ToPath(string s)
{
  var builder = new StringBuilder(s);
  foreach (var invalidChar in Path.GetInvalidFileNameChars())
  {
    builder.Replace(invalidChar.ToString(), "");
  }
  builder.Replace(' ', '_');
  return builder.ToString();
}