public async Task VerifyRestartingResetsTheCollectionAndAllowsForMoreFetching()
{
var service = new Mock <IGetByFilterService <TestDto, TestFilter> >();
var source = new TaskCompletionSource <PaginatedEnumerable <TestDto> >();
service.Setup(s => s.GetItems(It.IsAny <TestFilter>())).Returns(async() => await source.Task);
var collection = new ObservableServiceCollection <TestDto, TestFilter, IGetByFilterService <TestDto, TestFilter> >(service.Object);
source.SetResult(new PaginatedEnumerable <TestDto>(new[] { new TestDto {
Id = 1
} }, 1));
await collection.LoadMore();
collection.Count.ShouldBe(1);
collection.IsLoading.ShouldBeFalse();
collection.ReachedBottom.ShouldBeTrue();
collection[0].Id.ShouldBe(1);
source = new TaskCompletionSource <PaginatedEnumerable <TestDto> >();
var task = collection.Restart();
collection.ReachedBottom.ShouldBeFalse();
collection.IsLoading.ShouldBeTrue();
collection.Count.ShouldBe(0);
source.SetResult(new PaginatedEnumerable <TestDto>(new[] { new TestDto {
Id = 2
} }, 1));
await task;
collection.Count.ShouldBe(1);
collection.IsLoading.ShouldBeFalse();
collection.ReachedBottom.ShouldBeTrue();
collection[0].Id.ShouldBe(2);
}
public async Task VerifyRetrievingFetchesData()
{
var service = new Mock <IGetByFilterService <TestDto, TestFilter> >();
var paginatedEnumerable = new PaginatedEnumerable <TestDto>();
service.Setup(s => s.GetItems(It.IsAny <TestFilter>())).Returns(async() => paginatedEnumerable);
var collection = new ObservableServiceCollection <TestDto, TestFilter, IGetByFilterService <TestDto, TestFilter> >(service.Object);
paginatedEnumerable.AddRange(new[] { new TestDto {
Id = 1
}, new TestDto {
Id = 2
}, new TestDto {
Id = 3
} });
collection.Count.ShouldBe(0);
await collection.LoadMore();
collection.Count.ShouldBe(3);
collection[0].Id.ShouldBe(1);
collection[1].Id.ShouldBe(2);
collection[2].Id.ShouldBe(3);
}
public void VerifyOwnsBookChangesWhenBookIsAddedToMyBooksCollection()
{
var book = new DetailedBookDto
{
Id = 5
};
var booksService = new Mock <IBooksService>();
var collection = new ObservableServiceCollection <BookDto, BookFilter, IBooksService>(booksService.Object);
booksService.SetupGet(s => s.MyBooks).Returns(collection);
var shoppingCartService = new Mock <IShoppingCartService>();
var authService = new Mock <IAuthenticationService>();
var viewModel = new BookSummaryViewModel(book, booksService.Object, shoppingCartService.Object, authService.Object);
int ownsBookChanged = 0;
viewModel.OwnsBook.ShouldBeFalse();
viewModel.PropertyChanged += (sender, args) =>
{
if (args.PropertyName != nameof(viewModel.OwnsBook))
{
return;
}
ownsBookChanged++;
};
collection.Add(book);
viewModel.OwnsBook.ShouldBeTrue();
ownsBookChanged.ShouldBe(1);
}
public async Task VerifyMaxCountDisablesLoadingMore()
{
var service = new Mock <IGetByFilterService <TestDto, TestFilter> >();
var source = new TaskCompletionSource <PaginatedEnumerable <TestDto> >();
service.Setup(s => s.GetItems(It.IsAny <TestFilter>())).Returns(async() => await source.Task);
var collection = new ObservableServiceCollection <TestDto, TestFilter, IGetByFilterService <TestDto, TestFilter> >(service.Object);
collection.Count.ShouldBe(0);
var task = collection.LoadMore();
collection.Count.ShouldBe(0);
collection.IsLoading.ShouldBeTrue();
collection.ReachedBottom.ShouldBeFalse();
source.SetResult(new PaginatedEnumerable <TestDto>(new[] { new TestDto {
Id = 1
} }, 1));
await task;
collection.Count.ShouldBe(1);
collection.IsLoading.ShouldBeFalse();
collection.ReachedBottom.ShouldBeTrue();
task = collection.LoadMore();
task.IsCompleted.ShouldBeTrue();
collection.IsLoading.ShouldBeFalse();
collection.ReachedBottom.ShouldBeTrue();
await task;
collection.Count.ShouldBe(1);
collection.IsLoading.ShouldBeFalse();
collection.ReachedBottom.ShouldBeTrue();
service.Verify(s => s.GetItems(It.IsAny <TestFilter>()), Times.Once);
}