public void progress_time_span_is_not_reset_to_zero_if_another_exercise_is_started()
{
var scheduler = new TestSchedulerService();
var model1 = new ExerciseBuilder()
.WithName("model 1")
.Build();
var model2 = new ExerciseBuilder()
.WithName("model 2")
.Build();
var executionContext = new ExecutionContext();
var sut = new ExerciseViewModelBuilder()
.WithSchedulerService(scheduler)
.WithExecutionContext(executionContext)
.WithModel(model1)
.Build();
executionContext.SetCurrentExercise(model1);
executionContext.AddProgress(TimeSpan.FromSeconds(3));
scheduler.AdvanceMinimal();
Assert.Equal(TimeSpan.FromSeconds(3), sut.ProgressTimeSpan);
executionContext.SetCurrentExercise(model2);
scheduler.AdvanceMinimal();
Assert.Equal(TimeSpan.FromSeconds(3), sut.ProgressTimeSpan);
executionContext.AddProgress(TimeSpan.FromSeconds(3));
scheduler.AdvanceMinimal();
Assert.Equal(TimeSpan.FromSeconds(3), sut.ProgressTimeSpan);
}
public void progress_is_calculated_based_on_duration_and_progress_time_span(int durationInMs, int progressInMs, double expectedProgress)
{
var scheduler = new TestSchedulerService();
var action = new ActionMock(MockBehavior.Loose);
action
.When(x => x.Duration)
.Return(TimeSpan.FromMilliseconds(durationInMs));
var model = new ExerciseBuilder()
.WithBeforeExerciseAction(action)
.Build();
var executionContext = new ExecutionContext();
var sut = new ExerciseViewModelBuilder()
.WithSchedulerService(scheduler)
.WithExecutionContext(executionContext)
.WithModel(model)
.Build();
executionContext.SetCurrentExercise(model);
executionContext.AddProgress(TimeSpan.FromMilliseconds(progressInMs));
scheduler.AdvanceMinimal();
Assert.Equal(expectedProgress, sut.Progress);
}
public void progress_time_span_reflects_any_progression_through_the_exercise()
{
var scheduler = new TestSchedulerService();
var model = new ExerciseBuilder()
.Build();
var executionContext = new ExecutionContext();
var sut = new ExerciseViewModelBuilder()
.WithSchedulerService(scheduler)
.WithExecutionContext(executionContext)
.WithModel(model)
.Build();
executionContext.SetCurrentExercise(model);
scheduler.AdvanceMinimal();
Assert.Equal(TimeSpan.Zero, sut.ProgressTimeSpan);
executionContext.AddProgress(TimeSpan.FromSeconds(3));
scheduler.AdvanceMinimal();
Assert.Equal(TimeSpan.FromSeconds(3), sut.ProgressTimeSpan);
executionContext.AddProgress(TimeSpan.FromSeconds(2));
scheduler.AdvanceMinimal();
Assert.Equal(TimeSpan.FromSeconds(5), sut.ProgressTimeSpan);
}
public void document_is_not_stored_in_cache_if_loaded_from_cache()
{
var document = "# First Program";
var scheduler = new TestSchedulerService();
var stateService = new StateServiceMock();
stateService
.When(x => x.GetAsync <string>(It.IsAny <string>()))
.Return(Observable.Return(document));
stateService
.When(x => x.SetAsync <string>(It.IsAny <string>(), It.IsAny <string>()))
.Return(Observable.Return(Unit.Default));
var sut = new ExerciseProgramsViewModelBuilder()
.WithSchedulerService(scheduler)
.WithStateService(stateService)
.Build();
scheduler.AdvanceMinimal();
Assert.Equal(ExerciseProgramsViewModelStatus.LoadedFromCache, sut.Status);
stateService
.Verify(x => x.SetAsync <string>("ExerciseProgramsDocument", document))
.WasNotCalled();
}
public void execution_context_is_cancelled_if_user_navigates_away()
{
var scheduler = new TestSchedulerService();
var sut = new ExerciseProgramViewModelBuilder()
.WithModel(new ExerciseProgramBuilder()
.AddExercise(new ExerciseBuilder()
.WithBeforeExerciseAction(
new WaitActionBuilder()
.WithDelayService(new DelayServiceBuilder().Build())
.WithDelay(TimeSpan.FromMinutes(1))
.Build())))
.WithSchedulerService(scheduler)
.Build();
sut
.HostScreen
.Router
.NavigationStack
.Add(sut);
sut.StartCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.True(sut.IsStarted);
sut
.HostScreen
.Router
.NavigateBack
.Execute(null);
scheduler.AdvanceMinimal();
Assert.False(sut.IsStarted);
}
public void is_pause_visible_cycles_correctly_if_start_command_is_executed()
{
var scheduler = new TestSchedulerService();
var action = new ActionMock(MockBehavior.Loose);
action
.When(x => x.Duration)
.Return(TimeSpan.FromMinutes(1));
action
.When(x => x.ExecuteAsync(It.IsAny <ExecutionContext>()))
.Return <ExecutionContext>(
ec =>
Observable
.Return(Unit.Default)
.Do(_ => { })
.Delay(TimeSpan.FromMinutes(1), scheduler.DefaultScheduler)
.Do(_ => ec.AddProgress(TimeSpan.FromMinutes(1))));
var sut = new ExerciseProgramViewModelBuilder()
.WithModel(
new ExerciseProgramBuilder()
.AddExercise(
new ExerciseBuilder()
.WithBeforeExerciseAction(action)))
.WithSchedulerService(scheduler)
.Build();
Assert.False(sut.IsPauseVisible);
sut.StartCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.True(sut.IsPauseVisible);
scheduler.AdvanceBy(TimeSpan.FromMinutes(10));
Assert.False(sut.IsPauseVisible);
}
public void skip_backwards_command_is_disabled_if_on_first_exercise()
{
var scheduler = new TestSchedulerService();
var action = new ActionMock(MockBehavior.Loose);
action
.When(x => x.ExecuteAsync(It.IsAny <ExecutionContext>()))
.Return <ExecutionContext>(
ec =>
{
ec.IsPaused = true;
return(ec.WaitWhilePausedAsync());
});
var sut = new ExerciseProgramViewModelBuilder()
.WithModel(new ExerciseProgramBuilder()
.AddExercise(new ExerciseBuilder()
.WithBeforeExerciseAction(action)))
.WithSchedulerService(scheduler)
.Build();
sut.StartCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.False(sut.SkipBackwardsCommand.CanExecute(null));
}
public void is_resume_visible_cycles_correctly_if_start_command_is_executed_and_execution_is_paused()
{
var scheduler = new TestSchedulerService();
var sut = new ExerciseProgramViewModelBuilder()
.WithModel(new ExerciseProgramBuilder()
.AddExercise(new ExerciseBuilder()
.WithBeforeExerciseAction(
new WaitActionBuilder()
.WithDelayService(new DelayServiceBuilder().Build())
.WithDelay(TimeSpan.FromMinutes(1))
.Build())))
.WithSchedulerService(scheduler)
.Build();
var isResumeVisible = sut
.WhenAnyValue(x => x.IsResumeVisible)
.CreateCollection();
sut.StartCommand.Execute(null);
scheduler.AdvanceMinimal();
sut.PauseCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.Equal(2, isResumeVisible.Count);
Assert.False(isResumeVisible[0]);
Assert.True(isResumeVisible[1]);
}
public void parse_error_message_is_null_if_a_document_is_successfully_parsed_after_one_fails_to_parse()
{
var badDocument = @"# First Program
## First Exercise
whatever!";
var goodDocument = "# First Program";
var documents = new Subject <string>();
var exerciseDocumentService = new ExerciseDocumentServiceMock();
var scheduler = new TestSchedulerService();
exerciseDocumentService
.When(x => x.ExerciseDocument)
.Return(documents);
var sut = new ExerciseProgramsViewModelBuilder()
.WithExerciseDocumentService(exerciseDocumentService)
.WithSchedulerService(scheduler)
.Build();
documents.OnNext(badDocument);
scheduler.AdvanceMinimal();
Assert.NotNull(sut.ParseErrorMessage);
documents.OnNext(goodDocument);
scheduler.AdvanceMinimal();
Assert.Null(sut.ParseErrorMessage);
}
protected virtual void Setup()
{
Splat.ModeDetector.InUnitTestRunner();
_schedulerService = new TestSchedulerService();
RxApp.MainThreadScheduler = _schedulerService.MainScheduler;
RxApp.TaskpoolScheduler = _schedulerService.MainScheduler;
_viewStackService = new Mock <IViewStackService>()
{
DefaultValue = DefaultValue.Mock
};
_viewStackService
.Setup(x => x.PushPage(It.IsAny <IPageViewModel>(), It.IsAny <string>(), It.IsAny <bool>(), It.IsAny <bool>()))
.Returns(() => Observable.Return(Unit.Default));
_viewStackService
.Setup(x => x.PushModal(It.IsAny <IPageViewModel>(), It.IsAny <string>()))
.Returns(() => Observable.Return(Unit.Default));
_viewStackService
.Setup(x => x.PopPage(It.IsAny <bool>()))
.Returns(() => Observable.Return(Unit.Default));
_viewStackService
.Setup(x => x.PopModal(It.IsAny <bool>()))
.Returns(() => Observable.Return(Unit.Default));
_viewStackService
.Setup(x => x.PopToRootPage(It.IsAny <bool>()))
.Returns(() => Observable.Return(Unit.Default));
_runtimeContextMock = new Mock <IRuntimeContext>()
{
DefaultValue = DefaultValue.Mock
};
RegisterDependencies();
}
public void is_start_visible_cycles_correctly_if_start_command_is_executed()
{
var scheduler = new TestSchedulerService();
var sut = new ExerciseProgramViewModelBuilder()
.WithSchedulerService(scheduler)
.Build();
scheduler.AdvanceMinimal();
var isStartVisible = sut
.WhenAnyValue(x => x.IsStartVisible)
.CreateCollection();
sut.StartCommand.Execute(null);
scheduler.AdvanceMinimal();
// TODO: the extra 2 values here appears to be due to ReactiveCommand's CanExecuteObservable implementation
// try this again once ReactiveCommand is re-written
Assert.Equal(5, isStartVisible.Count);
Assert.True(isStartVisible[0]);
Assert.False(isStartVisible[1]);
Assert.True(isStartVisible[2]);
Assert.False(isStartVisible[3]);
Assert.True(isStartVisible[4]);
}
public void current_exercise_reflects_that_in_the_execution_context()
{
var scheduler = new TestSchedulerService();
var action = new ActionMock();
action
.When(x => x.Duration)
.Return(TimeSpan.FromSeconds(10));
action
.When(x => x.ExecuteAsync(It.IsAny <ExecutionContext>()))
.Return <ExecutionContext>(
ec =>
{
ec.IsPaused = true;
return(ec.WaitWhilePausedAsync());
});
var exercise1 = new ExerciseBuilder()
.WithName("Exercise 1")
.WithBeforeExerciseAction(action)
.Build();
var exercise2 = new ExerciseBuilder()
.WithName("Exercise 2")
.WithBeforeExerciseAction(action)
.Build();
var exercise3 = new ExerciseBuilder()
.WithName("Exercise 3")
.WithBeforeExerciseAction(action)
.Build();
var sut = new ExerciseProgramViewModelBuilder()
.WithModel(new ExerciseProgramBuilder()
.AddExercise(exercise1)
.AddExercise(exercise2)
.AddExercise(exercise3))
.WithSchedulerService(scheduler)
.Build();
sut.StartCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.Equal("Exercise 1", sut.CurrentExercise?.Name);
sut.SkipForwardsCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.Equal("Exercise 2", sut.CurrentExercise?.Name);
sut.SkipForwardsCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.Equal("Exercise 3", sut.CurrentExercise?.Name);
sut.SkipBackwardsCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.Equal("Exercise 2", sut.CurrentExercise?.Name);
}
public void is_active_is_false_if_there_is_no_execution_context()
{
var scheduler = new TestSchedulerService();
var sut = new ExerciseViewModelBuilder()
.WithSchedulerService(scheduler)
.Build();
scheduler.AdvanceMinimal();
Assert.False(sut.IsActive);
}
public void skip_backwards_command_restarts_the_execution_context_from_the_start_of_the_previous_exercise_if_the_current_exercise_if_only_recently_started()
{
var scheduler = new TestSchedulerService();
var action = new ActionMock();
action
.When(x => x.Duration)
.Return(TimeSpan.FromSeconds(10));
action
.When(x => x.ExecuteAsync(It.IsAny <ExecutionContext>()))
.Return <ExecutionContext>(
ec =>
{
ec.AddProgress(TimeSpan.FromSeconds(0.5));
ec.IsPaused = true;
return(ec.WaitWhilePausedAsync());
});
var exercise1 = new ExerciseBuilder()
.WithName("Exercise 1")
.WithBeforeExerciseAction(action)
.Build();
var exercise2 = new ExerciseBuilder()
.WithName("Exercise 2")
.WithBeforeExerciseAction(action)
.Build();
var sut = new ExerciseProgramViewModelBuilder()
.WithModel(new ExerciseProgramBuilder()
.AddExercise(exercise1)
.AddExercise(exercise2))
.WithSchedulerService(scheduler)
.Build();
var progress = sut
.WhenAnyValue(x => x.ProgressTimeSpan)
.CreateCollection();
// start from the second exercise
sut.StartCommand.Execute(exercise1.Duration);
scheduler.AdvanceMinimal();
sut.SkipBackwardsCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.Equal(5, progress.Count);
Assert.Equal(TimeSpan.Zero, progress[0]);
Assert.Equal(TimeSpan.FromSeconds(10), progress[1]);
Assert.Equal(TimeSpan.FromSeconds(10.5), progress[2]);
Assert.Equal(TimeSpan.Zero, progress[3]);
Assert.Equal(TimeSpan.FromSeconds(10), progress[4]);
}
public void programs_is_null_if_both_cache_and_cloud_are_empty()
{
var scheduler = new TestSchedulerService();
var sut = new ExerciseProgramsViewModelBuilder()
.WithSchedulerService(scheduler)
.Build();
scheduler.AdvanceMinimal();
Assert.Null(sut.Programs);
}
public void skip_forwards_command_is_disabled_if_on_last_exercise()
{
var scheduler = new TestSchedulerService();
var action = new ActionMock();
action
.When(x => x.Duration)
.Return(TimeSpan.FromSeconds(10));
action
.When(x => x.ExecuteAsync(It.IsAny <ExecutionContext>()))
.Return <ExecutionContext>(
ec =>
{
ec.IsPaused = true;
return(ec.WaitWhilePausedAsync());
});
var exercise1 = new ExerciseBuilder()
.WithName("Exercise 1")
.WithBeforeExerciseAction(action)
.Build();
var exercise2 = new ExerciseBuilder()
.WithName("Exercise 2")
.WithBeforeExerciseAction(action)
.Build();
var sut = new ExerciseProgramViewModelBuilder()
.WithModel(new ExerciseProgramBuilder()
.AddExercise(exercise1)
.AddExercise(exercise2))
.WithSchedulerService(scheduler)
.Build();
var canExecute = sut
.SkipForwardsCommand
.CanExecuteObservable
.CreateCollection();
sut.StartCommand.Execute(null);
scheduler.AdvanceMinimal();
sut.SkipForwardsCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.Equal(5, canExecute.Count);
Assert.False(canExecute[0]);
Assert.True(canExecute[1]);
Assert.False(canExecute[2]);
Assert.True(canExecute[3]);
Assert.False(canExecute[4]);
}
public void is_start_visible_is_true_by_default()
{
var scheduler = new TestSchedulerService();
var sut = new ExerciseProgramViewModelBuilder()
.WithSchedulerService(scheduler)
.Build();
scheduler.AdvanceMinimal();
Assert.True(sut.IsStartVisible);
}
public void status_is_loaded_from_cloud_if_document_is_successfully_loaded_from_cloud()
{
var document = "# First Program";
var scheduler = new TestSchedulerService();
var sut = new ExerciseProgramsViewModelBuilder()
.WithCloudDocument(document)
.WithSchedulerService(scheduler)
.Build();
scheduler.AdvanceMinimal();
Assert.Equal(ExerciseProgramsViewModelStatus.LoadedFromService, sut.Status);
}
public void programs_is_populated_from_cloud_if_cache_is_empty_and_cloud_is_populated()
{
var document = "# First Program";
var scheduler = new TestSchedulerService();
var sut = new ExerciseProgramsViewModelBuilder()
.WithCloudDocument(document)
.WithSchedulerService(scheduler)
.Build();
scheduler.AdvanceMinimal();
Assert.NotNull(sut.Programs);
Assert.Equal(1, sut.Programs.Count);
}
public void skip_forwards_command_skips_to_the_next_exercise()
{
var scheduler = new TestSchedulerService();
var action = new ActionMock();
action
.When(x => x.Duration)
.Return(TimeSpan.FromSeconds(10));
action
.When(x => x.ExecuteAsync(It.IsAny <ExecutionContext>()))
.Return <ExecutionContext>(
ec =>
{
ec.IsPaused = true;
return(ec.WaitWhilePausedAsync());
});
var exercise1 = new ExerciseBuilder()
.WithName("Exercise 1")
.WithBeforeExerciseAction(action)
.Build();
var exercise2 = new ExerciseBuilder()
.WithName("Exercise 2")
.WithBeforeExerciseAction(action)
.Build();
var sut = new ExerciseProgramViewModelBuilder()
.WithModel(new ExerciseProgramBuilder()
.AddExercise(exercise1)
.AddExercise(exercise2))
.WithSchedulerService(scheduler)
.Build();
var progress = sut
.WhenAnyValue(x => x.ProgressTimeSpan)
.CreateCollection();
sut.StartCommand.Execute(null);
scheduler.AdvanceMinimal();
sut.SkipForwardsCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.Equal(2, progress.Count);
Assert.Equal(TimeSpan.Zero, progress[0]);
Assert.Equal(TimeSpan.FromSeconds(10), progress[1]);
}
public void programs_yields_any_successfully_parsed_programs()
{
var document = "# First Program";
var scheduler = new TestSchedulerService();
var sut = new ExerciseProgramsViewModelBuilder()
.WithCloudDocument(document)
.WithSchedulerService(scheduler)
.Build();
scheduler.AdvanceMinimal();
Assert.NotNull(sut.Programs);
Assert.Equal(1, sut.Programs.Count);
Assert.Equal("First Program", sut.Programs.ElementAt(0).Name);
}
public void status_is_parse_failed_if_the_document_could_not_be_parsed()
{
var document = @"# First Program
## First Exercise
whatever!";
var scheduler = new TestSchedulerService();
var sut = new ExerciseProgramsViewModelBuilder()
.WithCloudDocument(document)
.WithSchedulerService(scheduler)
.Build();
scheduler.AdvanceMinimal();
Assert.Equal(ExerciseProgramsViewModelStatus.ParseFailed, sut.Status);
}
public void status_is_load_failed_if_the_document_fails_to_load_altogether()
{
var exerciseDocumentService = new ExerciseDocumentServiceMock();
var scheduler = new TestSchedulerService();
exerciseDocumentService
.When(x => x.ExerciseDocument)
.Return(Observable.Throw <string>(new InvalidOperationException()));
var sut = new ExerciseProgramsViewModelBuilder()
.WithExerciseDocumentService(exerciseDocumentService)
.WithSchedulerService(scheduler)
.Build();
scheduler.AdvanceMinimal();
Assert.Equal(ExerciseProgramsViewModelStatus.LoadFailed, sut.Status);
}
public void parse_error_message_returns_appropriate_message_if_the_document_could_not_be_parsed()
{
var document = @"# First Program
## First Exercise
whatever!";
var scheduler = new TestSchedulerService();
var sut = new ExerciseProgramsViewModelBuilder()
.WithCloudDocument(document)
.WithSchedulerService(scheduler)
.Build();
scheduler.AdvanceMinimal();
Assert.NotNull(sut.ParseErrorMessage);
Assert.Equal("Parsing failure: unexpected '#'; expected end of input (Line 3, Column 1); recently consumed: rogram\r\n\r\n", sut.ParseErrorMessage);
}
public void Setup()
{
_schedulerServiceMock = new TestSchedulerService();
_viewStackServiceMock = new Mock <IViewStackService>()
{
DefaultValue = DefaultValue.Mock
};
Locator.CurrentMutable.Register(() => _schedulerServiceMock, typeof(ISchedulerService));
Locator.CurrentMutable.Register(() => _viewStackServiceMock.Object, typeof(IViewStackService));
_targetMock = new Mock <ViewModelBase>(
_schedulerServiceMock,
_viewStackServiceMock.Object,
" ");
_target = _targetMock.Object;
}
public void is_active_is_true_if_this_exercise_is_the_current_exercise()
{
var scheduler = new TestSchedulerService();
var model = new ExerciseBuilder()
.Build();
var executionContext = new ExecutionContext();
var sut = new ExerciseViewModelBuilder()
.WithSchedulerService(scheduler)
.WithExecutionContext(executionContext)
.WithModel(model)
.Build();
scheduler.AdvanceMinimal();
Assert.False(sut.IsActive);
executionContext.SetCurrentExercise(model);
scheduler.AdvanceMinimal();
Assert.True(sut.IsActive);
}
public void progress_is_updated_throughout_execution()
{
var scheduler = new TestSchedulerService();
var action = new ActionMock(MockBehavior.Loose);
action
.When(x => x.Duration)
.Return(TimeSpan.FromMinutes(1));
action
.When(x => x.ExecuteAsync(It.IsAny <ExecutionContext>()))
.Return <ExecutionContext>(
ec =>
{
ec.AddProgress(TimeSpan.FromSeconds(15));
ec.AddProgress(TimeSpan.FromSeconds(30));
ec.IsPaused = true;
return(ec.WaitWhilePausedAsync());
});
var sut = new ExerciseProgramViewModelBuilder()
.WithModel(new ExerciseProgramBuilder()
.AddExercise(new ExerciseBuilder()
.WithBeforeExerciseAction(action)))
.WithSchedulerService(scheduler)
.Build();
var progress = sut
.WhenAnyValue(x => x.Progress)
.CreateCollection();
sut.StartCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.Equal(3, progress.Count);
Assert.Equal(0, progress[0]);
Assert.Equal(0.25, progress[1]);
Assert.Equal(0.75, progress[2]);
}
public void delay_async_cancels_the_delay_if_cancellation_token_is_cancelled()
{
var scheduler = new TestSchedulerService();
var sut = new DelayServiceBuilder()
.WithSchedulerService(scheduler)
.Build();
var cts = new CancellationTokenSource();
Exception exception = null;
var delayResult = sut
.DelayAsync(TimeSpan.FromSeconds(5), cts.Token)
.Subscribe(
_ => { },
ex => exception = ex);
scheduler.AdvanceBy(TimeSpan.FromSeconds(1));
Assert.Null(exception);
cts.Cancel();
scheduler.AdvanceBy(TimeSpan.FromSeconds(5));
Assert.IsType <OperationCanceledException>(exception);
}
public void is_started_cycles_correctly_if_start_command_is_executed()
{
var scheduler = new TestSchedulerService();
var sut = new ExerciseProgramViewModelBuilder()
.WithSchedulerService(scheduler)
.Build();
scheduler.AdvanceMinimal();
var isStarted = sut
.WhenAnyValue(x => x.IsStarted)
.CreateCollection();
sut.StartCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.Equal(3, isStarted.Count);
Assert.False(isStarted[0]);
Assert.True(isStarted[1]);
Assert.False(isStarted[2]);
}
public void skip_backwards_command_restarts_the_execution_context_from_the_start_of_the_current_exercise_if_sufficient_progress_has_been_made()
{
var scheduler = new TestSchedulerService();
var action = new ActionMock(MockBehavior.Loose);
action
.When(x => x.ExecuteAsync(It.IsAny <ExecutionContext>()))
.Return <ExecutionContext>(
ec =>
{
ec.AddProgress(TimeSpan.FromSeconds(4));
ec.IsPaused = true;
return(ec.WaitWhilePausedAsync());
});
var sut = new ExerciseProgramViewModelBuilder()
.WithModel(new ExerciseProgramBuilder()
.AddExercise(new ExerciseBuilder()
.WithBeforeExerciseAction(action)))
.WithSchedulerService(scheduler)
.Build();
var progress = sut
.WhenAnyValue(x => x.ProgressTimeSpan)
.CreateCollection();
sut.StartCommand.Execute(null);
scheduler.AdvanceMinimal();
sut.SkipBackwardsCommand.Execute(null);
scheduler.AdvanceMinimal();
Assert.Equal(3, progress.Count);
Assert.Equal(TimeSpan.Zero, progress[0]);
Assert.Equal(TimeSpan.FromSeconds(4), progress[1]);
Assert.Equal(TimeSpan.Zero, progress[2]);
}
