public void GetScreenshotElementNone(string actionRule)
{
// execute
var screenshot = ExecuteAction <GetScreenshot>(MockBy.None(), actionRule)
.ExtractionResults[0]
.Entities[0]
.EntityContentEntries["screenshot"];
// assertion (no assertion here, expected is no exception)
Assert.IsTrue(File.Exists($"{OutputDir}/image-b.png"));
Assert.IsTrue(screenshot.Contains("image-b.png"));
}