public void HandleAsync_IfResultIsSet_CallsResultExecuteAsync()
{
// Arrange
using (HttpResponseMessage response = CreateResponse())
{
Mock <IHttpActionResult> mock = new Mock <IHttpActionResult>(MockBehavior.Strict);
mock.Setup(r => r.ExecuteAsync(It.IsAny <CancellationToken>())).Returns(Task.FromResult(response));
IHttpActionResult result = mock.Object;
IExceptionHandler handler = CreateResultHandler(result);
using (CancellationTokenSource tokenSource = CreateCancellationTokenSource())
{
ExceptionContext context = CreateMinimalValidContext();
CancellationToken expectedCancellationToken = tokenSource.Token;
// Act
Task task = ExceptionHandlerExtensions.HandleAsync(handler, context,
expectedCancellationToken);
// Assert
Assert.NotNull(task);
task.WaitUntilCompleted();
task.ThrowIfFaulted();
mock.Verify(h => h.ExecuteAsync(expectedCancellationToken), Times.Once());
}
}
}
public void HandleAsync_IfResultIsSetButReturnsNull_ReturnsFaultedTask()
{
// Arrange
Mock <IHttpActionResult> mock = new Mock <IHttpActionResult>(MockBehavior.Strict);
mock
.Setup(r => r.ExecuteAsync(It.IsAny <CancellationToken>()))
.Returns(Task.FromResult <HttpResponseMessage>(null));
IHttpActionResult result = mock.Object;
IExceptionHandler handler = CreateResultHandler(result);
ExceptionContext context = CreateMinimalValidContext();
CancellationToken cancellationToken = CancellationToken.None;
// Act
Task <HttpResponseMessage> task =
ExceptionHandlerExtensions.HandleAsync(handler, context, cancellationToken);
// Assert
Assert.NotNull(task);
task.WaitUntilCompleted();
Assert.Equal(TaskStatus.Faulted, task.Status);
Assert.NotNull(task.Exception);
Exception exception = task.Exception.GetBaseException();
Assert.IsType <InvalidOperationException>(exception);
Assert.Equal("IHttpActionResult.ExecuteAsync must not return null.", exception.Message);
}
public async Task HandleAsync_CallsInterfaceHandleAsync()
{
// Arrange
Mock <IExceptionHandler> mock = CreateStubHandlerMock();
IExceptionHandler handler = mock.Object;
using (CancellationTokenSource tokenSource = CreateCancellationTokenSource())
{
ExceptionContext expectedContext = CreateMinimalValidContext();
CancellationToken expectedCancellationToken = tokenSource.Token;
// Act
await ExceptionHandlerExtensions.HandleAsync(
handler,
expectedContext,
expectedCancellationToken
);
// Assert
mock.Verify(
h =>
h.HandleAsync(
It.Is <ExceptionHandlerContext>(
c => c.ExceptionContext == expectedContext
),
expectedCancellationToken
),
Times.Once()
);
}
}
public void HandleAsync_IfHandlerIsNull_Throws()
{
// Arrange
IExceptionHandler handler = null;
ExceptionContext context = CreateMinimalValidContext();
CancellationToken cancellationToken = CancellationToken.None;
// Act & Assert
Assert.ThrowsArgumentNull(() =>
ExceptionHandlerExtensions.HandleAsync(handler, context, cancellationToken), "handler");
}
public void HandleAsync_IfContextIsNull_Throws()
{
// Arrange
IExceptionHandler handler = CreateDummyHandler();
ExceptionContext context = null;
CancellationToken cancellationToken = CancellationToken.None;
// Act & Assert
Assert.ThrowsArgumentNull(() =>
ExceptionHandlerExtensions.HandleAsync(handler, context, cancellationToken), "context");
}
public async Task HandleAsync_IfResultIsNotSet_ReturnsCompletedTaskWithNullResponse()
{
// Arrange
IExceptionHandler handler = CreateStubHandler();
ExceptionContext context = CreateMinimalValidContext();
CancellationToken cancellationToken = CancellationToken.None;
// Act
HttpResponseMessage response = await ExceptionHandlerExtensions.HandleAsync(handler, context, cancellationToken);
// Assert
Assert.Null(response);
}
public void HandleAsync_IfResultIsNotSet_ReturnsCompletedTaskWithNullResponse()
{
// Arrange
IExceptionHandler handler = CreateStubHandler();
ExceptionContext context = CreateMinimalValidContext();
CancellationToken cancellationToken = CancellationToken.None;
// Act
Task <HttpResponseMessage> task = ExceptionHandlerExtensions.HandleAsync(handler, context,
cancellationToken);
// Assert
Assert.NotNull(task);
task.WaitUntilCompleted();
Assert.Equal(TaskStatus.RanToCompletion, task.Status);
Assert.Null(task.Result);
}
public async Task HandleAsync_IfResultIsSetButReturnsNull_ReturnsFaultedTask()
{
// Arrange
Mock <IHttpActionResult> mock = new Mock <IHttpActionResult>(MockBehavior.Strict);
mock
.Setup(r => r.ExecuteAsync(It.IsAny <CancellationToken>()))
.Returns(Task.FromResult <HttpResponseMessage>(null));
IHttpActionResult result = mock.Object;
IExceptionHandler handler = CreateResultHandler(result);
ExceptionContext context = CreateMinimalValidContext();
CancellationToken cancellationToken = CancellationToken.None;
// Act & Assert
var exception = await Assert.ThrowsAsync <InvalidOperationException>(
() => ExceptionHandlerExtensions.HandleAsync(handler, context, cancellationToken));
Assert.Equal("IHttpActionResult.ExecuteAsync must not return null.", exception.Message);
}
public void HandleAsync_CallsInterfaceHandleAsync()
{
// Arrange
Mock <IExceptionHandler> mock = CreateStubHandlerMock();
IExceptionHandler handler = mock.Object;
using (CancellationTokenSource tokenSource = CreateCancellationTokenSource())
{
ExceptionContext expectedContext = CreateMinimalValidContext();
CancellationToken expectedCancellationToken = tokenSource.Token;
// Act
Task task = ExceptionHandlerExtensions.HandleAsync(handler, expectedContext,
expectedCancellationToken);
// Assert
Assert.NotNull(task);
task.WaitUntilCompleted();
task.ThrowIfFaulted();
mock.Verify(h => h.HandleAsync(It.Is <ExceptionHandlerContext>(
c => c.ExceptionContext == expectedContext), expectedCancellationToken), Times.Once());
}
}
