/// <summary>
/// Creates a new instance of the unit test synchronization context and sets this instance as current synchronization context for this thread.
/// </summary>
/// <returns>The unit test synchronization context.</returns>
public static UnitTestSynchronizationContext Create()
{
var context = new UnitTestSynchronizationContext();
SetSynchronizationContext(context);
return(context);
}
/// <summary>
/// Process the message queue until the task is completed.
/// </summary>
/// <param name="task">The task to wait for completion.</param>
/// <param name="context">The current unit test synchronization context.</param>
/// <exception cref="ArgumentNullException">task must not be null.</exception>
/// <exception cref="ArgumentNullException">context must not be null.</exception>
public static void Wait(this Task task, UnitTestSynchronizationContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
context.Wait(task);
}
/// <summary>
/// Process the message queue until the task is completed and returns the task's result.
/// </summary>
/// <param name="task">The task to wait for completion.</param>
/// <param name="context">The current unit test synchronization context.</param>
/// <exception cref="ArgumentNullException">task must not be null.</exception>
/// <exception cref="ArgumentNullException">context must not be null.</exception>
public static T GetResult <T>(this Task <T> task, UnitTestSynchronizationContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
context.Wait(task);
return(task.Result);
}
/// <summary>
/// Process the message queue until the predicate returns true.
/// This method uses a polling approach and therefore the predicate is called often.
/// </summary>
/// <param name="context">The current unit test synchronization context.</param>
/// <param name="predicate">The predicate returns true when the waiting should end.</param>
/// <param name="timeout">Defines a timeout for the waiting.</param>
/// <exception cref="ArgumentNullException">context must not be null.</exception>
/// <exception cref="ArgumentNullException">predicate must not be null.</exception>
/// <exception cref="TimeoutException">A timeout occurred.</exception>
public static void WaitFor(this UnitTestSynchronizationContext context, Func<bool> predicate, TimeSpan timeout)
{
if (context == null) throw new ArgumentNullException(nameof(context));
if (predicate == null) throw new ArgumentNullException(nameof(predicate));
var sw = Stopwatch.StartNew();
while (!predicate())
{
if (sw.Elapsed > timeout)
{
throw new TimeoutException();
}
context.Wait(TimeSpan.FromMilliseconds(5));
}
}
