public void ChangingSearchTermShouldResultInSearchResults()
{
(new TestScheduler()).With(sched => {
// Create a dummy Observable representing the actual query
var searchObservable = Observable.Return(createSampleResults())
.Delay(TimeSpan.FromMilliseconds(5 * 1000), RxApp.TaskpoolScheduler);
// Create a dummy command to pass to the ViewModel that returns
// our Observable
var command = new ReactiveAsyncCommand();
command.RegisterAsyncObservable(x => searchObservable);
var fixture = new AppViewModel(command, searchObservable);
Assert.IsTrue(fixture.SearchResults.Count == 0);
fixture.SearchTerm = "Foo";
// At 2 seconds in, we shouldn't have results yet
sched.RunToMilliseconds(2 * 1000);
Assert.IsTrue(fixture.SearchResults.Count == 0);
// At 10 seconds, we should have the sample results
var sampleData = createSampleResults();
sched.RunToMilliseconds(10 * 1000);
Assert.AreEqual(sampleData.Count, fixture.SearchResults.Count);
// Make sure the two sequences are identical
foreach(var item in sampleData.Zip(fixture.SearchResults, (expected, actual) => new { expected, actual })) {
Assert.AreEqual(item.expected.Title, item.actual.Title);
Assert.AreEqual(item.expected.Description, item.actual.Description);
Assert.AreEqual(item.expected.Url, item.actual.Url);
}
});
}
public void SearchesShouldntRunOnEveryKeystroke()
{
/* What does this first line do?
*
* Remember that in RxUI, there are two Schedulers that the framework
* uses: the Deferred Scheduler (i.e. the 'UI thread'), and the Task Pool
* Scheduler (i.e. 'run stuff on the background').
*
* Here, we create a new Test Scheduler, and call the With method -
* this means that inside the block given, the "official" schedulers
* are replaced with our test scheduler.
*/
(new TestScheduler()).With(sched => {
// Simulate the user entering some stuff into the TextBox
var keyboardInput = sched.CreateColdObservable(
sched.OnNextAt(10, "R"),
sched.OnNextAt(20, "Ro"),
sched.OnNextAt(30, "Robo"),
sched.OnNextAt(40, "Robot"),
sched.OnNextAt(2000, "Hat"));
// Make sure that the command can always execute if asked, stub
// out the actual search code
var fixture = new AppViewModel(new ReactiveAsyncCommand(null, 1000), Observable.Never<List<FlickrPhoto>>());
// Wire up the keyboard input
keyboardInput.Subscribe(x => fixture.SearchTerm = x);
// Keep count of how many times the command was invoked
int numTimesCommandInvoked = 0;
fixture.ExecuteSearch.Subscribe(x => numTimesCommandInvoked++);
//
// Now the fun part - we're going to travel through time and see
// how many times the command gets invoked!
//
sched.RunToMilliseconds(25);
Assert.AreEqual(0, numTimesCommandInvoked);
sched.RunToMilliseconds(40);
Assert.AreEqual(0, numTimesCommandInvoked);
sched.RunToMilliseconds(1800);
Assert.AreEqual(1, numTimesCommandInvoked);
sched.RunToMilliseconds(2010);
Assert.AreEqual(1, numTimesCommandInvoked);
sched.RunToMilliseconds(5000);
Assert.AreEqual(2, numTimesCommandInvoked);
});
}
public MainWindow()
{
ViewModel = new AppViewModel();
InitializeComponent();
}
public void SpinnerShouldSpinWhileAppIsSearching()
{
(new TestScheduler()).With(sched => {
// Here, we're going to create a dummy Observable that mocks
// a web service call - mocking things that happen over time is
// often tricky, but not with Rx!
var searchObservable = Observable.Return(createSampleResults())
.Delay(TimeSpan.FromMilliseconds(5000), RxApp.TaskpoolScheduler);
var command = new ReactiveAsyncCommand();
command.RegisterAsyncObservable(x => searchObservable);
var fixture = new AppViewModel(command, searchObservable);
// The spinner should be hidden on startup
Assert.AreNotEqual(Visibility.Visible, fixture.SpinnerVisibility);
// Invoke the command
fixture.ExecuteSearch.Execute("Robot");
// Once we run the command, we should be showing the spinner
sched.RunToMilliseconds(100);
Assert.AreEqual(Visibility.Visible, fixture.SpinnerVisibility);
// Fast forward to 6sec, the spinner should now be gone
sched.RunToMilliseconds(6 * 1000);
Assert.AreNotEqual(Visibility.Visible, fixture.SpinnerVisibility);
});
}
public MainWindow()
{
ViewModel = new AppViewModel();
InitializeComponent();
}