public async Task WatchDoesNotCallCanExecuteWhenNoNewFileAppears()
{
//Fixture setup
var commandStub = new Mock <ICommand>();
bool canExecuteCalled = false;
commandStub
.Setup(command => command.CanExecute(It.IsAny <object>()))
.Callback(() => canExecuteCalled = true);
var sut = new CommandExecutingDirectoryWatcher(Config.WatchedPaths, commandStub.Object);
//Exercise system
var task = sut.Watch(1000);
await Task.Delay(1000);
await sut.Cancel();
try
{
await task;
}
catch (OperationCanceledException)
{
}
//Verify outcome
Assert.False(canExecuteCalled);
}
public async Task WatchCallsCommandExecuteWhenNewFileAppearsAndOnlyWhenCanExecuteReturnsTrue(bool canExecute)
{
//Fixture setup
var commandStub = new Mock <ICommand>();
bool executeCalled = false;
commandStub
.Setup(command => command.CanExecute(It.IsAny <object>()))
.Returns(canExecute);
commandStub
.Setup(command => command.ExecuteAsync(It.IsAny <object>()))
.Returns(Task.CompletedTask)
.Callback(() => executeCalled = true);
commandStub
.Setup(command => command.ExecuteAsync(It.IsAny <object>(), It.IsAny <CancellationToken>()))
.Returns(Task.CompletedTask)
.Callback(() => executeCalled = true);
commandStub
.Setup(command => command.Execute(It.IsAny <object>()))
.Callback(() => executeCalled = true);
var sut = new CommandExecutingDirectoryWatcher(Config.WatchedPaths, commandStub.Object);
//Exercise system
var task = sut.Watch(1000);
using (new TestFileSource(Path.Combine(Config.WatchedPaths.First(), "test.mkv"),
500 * 1024 * 1024))
{
await sut.Cancel();
try
{
await task;
}
catch (OperationCanceledException)
{
}
}
//Verify outcome
if (canExecute)
{
Assert.True(executeCalled);
}
else
{
Assert.False(executeCalled);
}
}
public async Task WatchTaskCancelledOnCancellationRequest()
{
//Fixture setup
var commandStub = new Mock <ICommand>();
commandStub
.Setup(command => command.ExecuteAsync(It.IsAny <object>()))
.Returns(Task.CompletedTask);
var sut = new CommandExecutingDirectoryWatcher(Config.WatchedPaths, commandStub.Object);
//Exercise system
var task = sut.Watch(1000);
await sut.Cancel().ConfigureAwait(true);
//Verify outcome
var e = await Assert.ThrowsAnyAsync <OperationCanceledException>(async() => await task);
Assert.True(task.IsCanceled);
//Teardown
}