A collection of Helpers that make unit testing easier / more effective. Note, example code uses Xunit mostly.
Contents
To test async code.
From Sven Grand's Article. Solution is an alternative to simply adding the line Thread.Sleep(WAITING_TIME_FOR_ASYNC_MS); before Assert.
This solution allows you to step through the tasks programatically (deterministically) in your test code. Not that this requres the tested method to accept a TaskScheduler so that you can test with this user-specified scheduler. Example of use is:
[Theory]
[InlineData(500)]
[InlineData(0)]
public void AsyncCommand_ExecuteAsync_IntParameter_Test(int parameter)
{
//Arrange
var dts = new DeterministicTaskScheduler();
ICommand command = new SafeCommand<int>(IntParameterTask,dts,null,null);
//Act
command.Execute(parameter);
dts.RunTasksUntilIdle();
//Assert
}The method overload looks like:
/// <summary>
/// For Unit Testing. Command runs using the specified <see cref="TaskScheduler"/>
/// </summary>
[EditorBrowsable(EditorBrowsableState.Never)]
public SafeCommand(
Func<T, Task> executeFunction,
TaskScheduler scheduler,
IViewModelBase viewModel = null,
Action<Exception> onException = null,
Func<T, bool> canExecute = null,
//bool mustRunOnCurrentSyncContext is moot
bool isBlocking = true
)