public void WritesAfterMessagesAreSent()
{
// Unlike most other tests, here we write a message, the server completes the
// task, write another message, server completes etc.
var fake = new FakeWriter();
var writer = new BufferedClientStreamWriter <string>(fake, 5);
// First message
var task1 = writer.WriteAsync("1");
fake.CompleteCurrentTask();
AssertCompletedWithStatus(task1, TaskStatus.RanToCompletion);
// Second message
var task2 = writer.WriteAsync("2");
fake.CompleteCurrentTask();
AssertCompletedWithStatus(task2, TaskStatus.RanToCompletion);
// Completion
var completionTask = writer.WriteCompleteAsync();
fake.CompleteCurrentTask();
AssertCompletedWithStatus(completionTask, TaskStatus.RanToCompletion);
fake.AssertMessages("1", "2");
fake.AssertCompleted();
}
public void CompleteAfterMessages()
{
var fake = new FakeWriter();
var writer = new BufferedClientStreamWriter <string>(fake, 5);
var task1 = writer.WriteAsync("1");
var task2 = writer.WriteAsync("2");
var completionTask = writer.WriteCompleteAsync();
AssertNotCompleted(task1, task2, completionTask);
// Server handles first message
fake.CompleteCurrentTask();
AssertCompletedWithStatus(task1, TaskStatus.RanToCompletion);
AssertNotCompleted(task2, completionTask);
// Server handles second message
fake.CompleteCurrentTask();
AssertCompletedWithStatus(task2, TaskStatus.RanToCompletion);
AssertNotCompleted(completionTask);
// Server handles completion
fake.CompleteCurrentTask();
AssertCompletedWithStatus(completionTask, TaskStatus.RanToCompletion);
fake.AssertMessages("1", "2");
fake.AssertCompleted();
}
public void CompleteWithNoWrites()
{
var fake = new FakeWriter();
var writer = new BufferedClientStreamWriter <string>(fake, 5);
var completionTask = writer.WriteCompleteAsync();
fake.CompleteCurrentTask();
AssertCompletedWithStatus(completionTask, TaskStatus.RanToCompletion);
fake.AssertMessages();
fake.AssertCompleted();
}
public async Task AtomicTaskCompletion()
{
const int testSize = 100;
var fake = new FakeWriter();
var writer = new BufferedClientStreamWriter <string>(fake, 1);
var msgs = Enumerable.Range(0, testSize).Select(x => x.ToString()).ToArray();
foreach (var msg in msgs)
{
// This write can fail if task completion inside writer is not atomic.
Task task = writer.WriteAsync(msg);
fake.CompleteCurrentTask();
await task.ConfigureAwait(false);
}
fake.AssertMessages(msgs);
}
public void TryWriteBeyondBuffer()
{
var fake = new FakeWriter();
var writer = new BufferedClientStreamWriter <string>(fake, 2);
var task1 = writer.WriteAsync("1");
var task2 = writer.WriteAsync("2");
var task3 = writer.TryWriteAsync("3");
Assert.Null(task3); // Couldn't write.
fake.CompleteCurrentTask(); // Message 1
WaitForSpace(writer);
// Now the buffer is smaller, we can write again.
var task4 = writer.TryWriteAsync("4");
Assert.NotNull(task4);
// Try to write completion, will fail as buffer is full.
var completionTask1 = writer.TryWriteCompleteAsync();
Assert.Null(completionTask1);
fake.CompleteCurrentTask(); // Message 2
WaitForSpace(writer);
// Now the buffer is smaller, we can write completion.
var completionTask2 = writer.TryWriteCompleteAsync();
Assert.NotNull(completionTask2);
fake.CompleteCurrentTask(); // Message 4
fake.CompleteCurrentTask(); // Completion
AssertCompletedWithStatus(task1, TaskStatus.RanToCompletion);
AssertCompletedWithStatus(task2, TaskStatus.RanToCompletion);
AssertCompletedWithStatus(task4, TaskStatus.RanToCompletion);
AssertCompletedWithStatus(completionTask2, TaskStatus.RanToCompletion);
fake.AssertMessages("1", "2", "4");
fake.AssertCompleted();
}
public void WriteBeyondBuffer()
{
var fake = new FakeWriter();
var writer = new BufferedClientStreamWriter <string>(fake, 2);
var task1 = writer.WriteAsync("1");
var task2 = writer.WriteAsync("2");
// The (object) cast is because to make xUnit understand that the call itself should throw;
// we don't return a failed task.
Assert.Throws <InvalidOperationException>(() => (object)writer.WriteAsync("3"));
fake.CompleteCurrentTask(); // Message 1
WaitForSpace(writer);
// Now the buffer is smaller, we can write again.
var task4 = writer.WriteAsync("4");
// Completion fails, no space in buffer
Assert.Throws <InvalidOperationException>(() => (object)writer.WriteCompleteAsync());
fake.CompleteCurrentTask(); // Message 2
WaitForSpace(writer);
// Completion succeeds, there is now space in the buffer.
var completionTask = writer.WriteCompleteAsync();
fake.CompleteCurrentTask(); // Message 4
fake.CompleteCurrentTask(); // Completion
AssertCompletedWithStatus(task1, TaskStatus.RanToCompletion);
AssertCompletedWithStatus(task2, TaskStatus.RanToCompletion);
AssertCompletedWithStatus(task4, TaskStatus.RanToCompletion);
AssertCompletedWithStatus(completionTask, TaskStatus.RanToCompletion);
fake.AssertMessages("1", "2", "4");
fake.AssertCompleted();
}
