public static void CompletesSynchronouslyIfAllTasksWereCompletedSynchronously(int arity)
{
var tasks = Enumerable.Repeat(CompletedTask, arity).ToArray();
var adapters = AwaiterAdapter.CreateAllAdapters(tasks);
AssertAllAdapters(adapters, adapter => adapter.IsCompleted);
}
public static void FirstExceptionIsThrown(int arity)
{
var sources = (
from index in Enumerable.Range(0, arity)
select new TaskCompletionSource <object>()).ToArray();
var adapters = AwaiterAdapter.CreateAllAdapters(sources.Select(source => source.Task).ToArray());
for (var i = sources.Length - 1; i >= 0; i--)
{
sources[i].SetException(new DummyException());
}
AssertAllAdapters(adapters, adapter =>
ReferenceEquals(
sources[0].Task.Exception.InnerException,
Assert.ThrowsAny <DummyException>(adapter.GetResult)));
}
public static async Task WaitsForAllTasksToCompleteWhenAllFail(int arity, int whichToWaitFor)
{
var source = new TaskCompletionSource <object>();
var tasks = (
from index in Enumerable.Range(0, arity)
select index == whichToWaitFor ? source.Task : FailedTask).ToArray();
var adapters = AwaiterAdapter.CreateAllAdapters(tasks);
AssertAllAdapters(adapters, adapter => !adapter.IsCompleted);
source.SetException(new DummyException());
foreach (var adapter in adapters)
{
await Assert.ThrowsAnyAsync <DummyException>(async() => await adapter);
}
AssertAllAdapters(adapters, adapter => adapter.IsCompleted);
}
public static async Task WaitsForAllTasksToCompleteWhenAllSucceed(int arity, int whichToWaitFor)
{
var source = new TaskCompletionSource <object>();
var tasks = (
from index in Enumerable.Range(0, arity)
select index == whichToWaitFor ? source.Task : CompletedTask).ToArray();
var adapters = AwaiterAdapter.CreateAllAdapters(tasks);
AssertAllAdapters(adapters, adapter => !adapter.IsCompleted);
source.SetResult(null);
foreach (var adapter in adapters)
{
await adapter;
}
AssertAllAdapters(adapters, adapter => adapter.IsCompleted);
}