public void CollectionSourceCacheEnabled_WhenCollectionIsRefreshed_InvokesSourceProvider()
{
List <Task> originalTasks = TaskRepository.GetTasks();
IEnumerable <Task> tasks = originalTasks;
Func <IEnumerable <Task> > sourceProvider = () => {
return(tasks);
};
var vm = new TaskListVM(TaskListVM.CreateDescriptor(sourceProvider, cacheSourceCollection: true));
CollectionAssert.AreEqual(
originalTasks,
vm.Tasks.Select(x => x.Source).ToList()
);
List <Task> refreshedTasks = TaskRepository.GetTasks();
tasks = refreshedTasks;
vm.RefreshTasks();
CollectionAssert.AreEqual(
refreshedTasks,
vm.Tasks.Select(x => x.Source).ToList()
);
}
public void CollectionSourceCacheEnabled_WhenCollectionChanges_DoesNotInvokeSourceProvider()
{
int sourceProviderInvocations = 0;
Func <IEnumerable <Task> > sourceProvider = () => {
sourceProviderInvocations++;
return(new List <Task>());
};
var vm = new TaskListVM(TaskListVM.CreateDescriptor(sourceProvider, cacheSourceCollection: true));
var loadTrigger = vm.Tasks;
vm.Tasks.Add(new TaskVM());
vm.Tasks.Clear();
Assert.AreEqual(1, sourceProviderInvocations);
}
public void CollectionSourceCacheDisabled_WhenCollectionChanges_DoesInvokeSourceProvider()
{
int sourceProviderInvocations = 0;
var sourceList = new List <Task>();
Func <IEnumerable <Task> > sourceProvider = () => {
sourceProviderInvocations++;
return(sourceList);
};
var vm = new TaskListVM(TaskListVM.CreateDescriptor(sourceProvider, cacheSourceCollection: false));
var loadTrigger = vm.Tasks;
vm.Tasks.Add(new TaskVM());
vm.Tasks.Clear();
Assert.IsTrue(sourceProviderInvocations >= 3);
}