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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Threading;
using Xunit;
namespace System.Web.Mvc.Async.Test
{
public class AsyncUtilTest
{
[Fact]
public void WrapCallbackForSynchronizedExecution_CallsSyncIfOperationCompletedAsynchronously()
{
// Arrange
MockAsyncResult asyncResult = new MockAsyncResult()
{
CompletedSynchronously = false,
IsCompleted = true
};
bool originalCallbackCalled = false;
AsyncCallback originalCallback = ar =>
{
Assert.Equal(asyncResult, ar);
originalCallbackCalled = true;
};
DummySynchronizationContext syncContext = new DummySynchronizationContext();
// Act
AsyncCallback retVal = AsyncUtil.WrapCallbackForSynchronizedExecution(originalCallback, syncContext);
retVal(asyncResult);
// Assert
Assert.True(originalCallbackCalled);
Assert.True(syncContext.SendCalled);
}
[Fact]
public void WrapCallbackForSynchronizedExecution_DoesNotCallSyncIfOperationCompletedSynchronously()
{
// Arrange
MockAsyncResult asyncResult = new MockAsyncResult()
{
CompletedSynchronously = true,
IsCompleted = true
};
bool originalCallbackCalled = false;
AsyncCallback originalCallback = ar =>
{
Assert.Equal(asyncResult, ar);
originalCallbackCalled = true;
};
DummySynchronizationContext syncContext = new DummySynchronizationContext();
// Act
AsyncCallback retVal = AsyncUtil.WrapCallbackForSynchronizedExecution(originalCallback, syncContext);
retVal(asyncResult);
// Assert
Assert.True(originalCallbackCalled);
Assert.False(syncContext.SendCalled);
}
[Fact]
public void WrapCallbackForSynchronizedExecution_ReturnsNullIfCallbackIsNull()
{
// Act
AsyncCallback retVal = AsyncUtil.WrapCallbackForSynchronizedExecution(null, new SynchronizationContext());
// Assert
Assert.Null(retVal);
}
[Fact]
public void WrapCallbackForSynchronizedExecution_ReturnsOriginalCallbackIfSyncContextIsNull()
{
// Arrange
AsyncCallback originalCallback = _ => { };
// Act
AsyncCallback retVal = AsyncUtil.WrapCallbackForSynchronizedExecution(originalCallback, null);
// Assert
Assert.Same(originalCallback, retVal);
}
private class DummySynchronizationContext : SynchronizationContext
{
public bool SendCalled { get; private set; }
public override void Send(SendOrPostCallback d, object state)
{
SendCalled = true;
base.Send(d, state);
}
}
}
}