public async Task IfBodyIsNull_ThenForEachAsyncThrowsArgumentNullException_SyncDelegateOverload()
{
IPagedEnumerable <string> seq = new PagedAlphabet();
var ex = await Assert.ThrowsAsync <ArgumentNullException>(() => seq.ForEachAsync((Action <string>)null));
Assert.Equal("body", ex.ParamName);
}
public async Task ToListAsyncCorrectlyHandlesEmptyCollections()
{
var seq = new PagedAlphabet(4, 0);
var list = await seq.ToListAsync();
Assert.Empty(list);
}
public async Task ForEachAsyncFuncSupportsCancellation()
{
PagedAlphabet seq = new PagedAlphabet(4, 10);
//Call with an already cancelled cancellation token
using CancellationTokenSource source = new CancellationTokenSource();
source.Cancel();
await Assert.ThrowsAsync <OperationCanceledException>(async() => await seq.ForEachAsync(item => Task.Delay(0), source.Token));
}
public async Task ToListAsyncCollectsAllElementsOfSequence()
{
var seq = new PagedAlphabet(4, 10);
var list = await seq.ToListAsync();
Assert.Equal(10, list.Count);
Assert.Equal("A", list.First());
Assert.Equal("J", list.Last());
}
public async Task ForEachAsyncVisitsEveryMemberOfTheSequence_SyncDelegateOverload()
{
var visited = new List <string>();
var seq = new PagedAlphabet();
await seq.ForEachAsync(s => visited.Add(s));
Assert.Equal(26, visited.Count);
Assert.Equal("A", visited.First());
Assert.Equal("Z", visited.Last());
}
public async Task ForEachAsyncVisitsEveryMemberOfTheSequence()
{
var visited = new List <string>();
var seq = new PagedAlphabet();
await seq.ForEachAsync(s => { visited.Add(s); return(Task.Delay(0)); });
Assert.Equal(26, visited.Count);
Assert.Equal("A", visited.First());
Assert.Equal("Z", visited.Last());
}
public async Task ToListAsyncSupportsCancellation()
{
PagedAlphabet seq = new PagedAlphabet(4, 10);
//Call with an already cancelled cancellation token
using (CancellationTokenSource source = new CancellationTokenSource())
{
source.Cancel();
await Assert.ThrowsAsync <OperationCanceledException>(async() => await seq.ToListAsync(source.Token));
}
}
