/// <summary>
/// Launches the Application code - This is equivalent to the Main Method.
/// </summary>
static private void StartAppThread(object threadArgument)
{
ApplicationDriver driver = (ApplicationDriver)threadArgument;
Dispatcher.CurrentDispatcher.Invoke(
DispatcherPriority.ApplicationIdle,
(ThreadStart) delegate
{
Application app = (Application)Activator.CreateInstance(driver.applicationType);
// Stock VS built WPF applications have an initializeComponent step which is performed as part of the Main method.
MethodInfo methodInfo = driver.applicationType.GetMethod("InitializeComponent");
if (methodInfo != null)
{
methodInfo.Invoke(app, null);
}
// Note: This is non-default step happens before Run. It is needed because the resourceAssembly we are testing is in the external WPF App bits.
Application.ResourceAssembly = driver.applicationType.Assembly;
app.Activated += (s, e) =>
{
Dispatcher.CurrentDispatcher.Invoke(
DispatcherPriority.ApplicationIdle,
(ThreadStart) delegate
{
driver.dispatcherIdle.Set();
MonitorDispatcherReadiness(driver, TimeSpan.FromMilliseconds(100), DispatcherPriority.ApplicationIdle);
});
};
app.Run();
});
}
/// <summary>
/// Uses a timer to signal every interval over the EventWaitHandle when the Dispatcher is Idle
/// </summary>
/// <param name="evt">The EventWaitHandle to signal out with</param>
/// <param name="interval">Time spent between polling</param>
/// <param name="priority">Priority of Dispatcher to Test against</param>
static private void MonitorDispatcherReadiness(ApplicationDriver driver, TimeSpan interval, DispatcherPriority priority)
{
DispatcherTimer timer = new DispatcherTimer(priority);
timer.Interval = interval;
// With each tick, we signal the idleness of the dispatcher on UI thread
timer.Tick += (sender, args) =>
{
driver.dispatcherIdle.Set();
};
timer.Start();
}
public void VerifyWindowAppearance()
{
ApplicationDriver driver = new ApplicationDriver(typeof(SampleApp.App));
driver.WaitForIdleUi();
AutomationElement window = AutomationUtilities.FindElementsById(AutomationElement.RootElement, "sampleAppWindow")[0];
AutomationElement styleBox = AutomationUtilities.FindElementsById(window, "styleBox")[0];
AutomationElement captureRegion = AutomationUtilities.FindElementsById(window, "captureContainer")[0];
AutomationHelpers.MoveToAndClick(styleBox);
driver.WaitForIdleUi();
try
{
// Capture the actual pixels from the bounds of the screen rectangle
Snapshot actual = Snapshot.FromRectangle(AutomationHelpers.GetElementSize(captureRegion));
LogFile(actual, "Actual.png");
// Load the reference/master data from a previously saved file
Snapshot master = Snapshot.FromFile(Path.Combine(TestContext.TestDeploymentDir, "Master0.png"));
LogFile(master, "Master.png");
// Log the outcome of the test, only on failure to save disk space.
// For test stability in scenarios of varying window styles, consider:
// -cropping the capture region to eliminate the border rectangle
// -Testing on a well controlled test environment
if (CompareImages(actual, master) == VerificationResult.Fail)
{
Assert.Fail("Initial State test failed. Actual should look like Master image. Refer to logged images under:" + TestContext.TestLogsDir);
}
}
finally
{
AutomationHelpers.CloseWindow(window);
driver.Join();
}
}
