public static async Task ConfirmScreenshot(this Page page, string name = null)
{
if (page == null)
{
throw new ArgumentNullException(nameof(page));
}
if (name == null)
{
name = TestContext.CurrentContext.Test.Name;
}
var w = page.Viewport.Width;
var h = page.Viewport.Height;
var index = TestContext.CurrentContext.Test.GetScreenIndex($"{w}{h}{name}");
var screenDir = $"{ScreensDirectory}{TestContext.CurrentContext.Test.ClassName}/{w}_{h}/{name}/";
new DirectoryInfo(screenDir).Create();
var expectedPath = InMemory ?
$"{screenDir}{name}_{index}_ExpectedIM.png"
:
$"{screenDir}{index}_Expected.png";
var deltaPath = $"{screenDir}{name}_{index}_Delta.png";
var actualPath = $"{screenDir}{name}_{index}_Actual.png";
var deltaInfo = new FileInfo(deltaPath);
// clean up a past failed test screenshot
if (deltaInfo.Exists)
{
deltaInfo.Delete();
}
await page.ScreenshotAsync(actualPath).ConfigureAwait(false);
using var actualBitmap = new Bitmap(actualPath);
TestContext.AddTestAttachment(actualPath);
var expectedInfo = new FileInfo(expectedPath);
if (!expectedInfo.Exists)
{
// if this is the first time the test has executed then assume the current screenshot is expected
actualBitmap.Save(expectedPath);
}
using var expectedBitmap = new Bitmap(expectedPath);
var compare = actualBitmap.Compare(expectedBitmap);
if (compare != null)
{
compare.Save(deltaPath);
TestContext.AddTestAttachment(deltaPath);
compare.Should().BeNull(); // trigger the test fail
}
}
