Unit testing ExceptionFilterAttribute - unit-testing

Question

I'm trying to unit test my exception filter code. I can validate the exception, but I can't seem to find the exception message to validate in the unit test. Here is my code...
public class ExceptionHandlingAttribute : ExceptionFilterAttribute
{
public override void OnException(HttpActionExecutedContext context)
{
if (context.Exception is TimeoutException)
{
context.Response = context.Request.CreateErrorResponse(HttpStatusCode.RequestTimeout, context.Exception.Message);
return;
}
if (context.Exception is UnauthorizedAccessException)
{
context.Response = context.Request.CreateErrorResponse(HttpStatusCode.Unauthorized, context.Exception.Message);
return;
}
context.Response = context.Request.CreateErrorResponse(HttpStatusCode.InternalServerError, "Unable to process your request.");
}
}
Unit Test Code
[Theory, MemberData("ExceptionData")]
public void OnExceptionTests(Exception ex, HttpStatusCode statusCode)
{
var request = new HttpRequestMessage();
var actionContext = InitializeActionContext(request);
var httpActionExectuedContext = new HttpActionExecutedContext(actionContext, ex);
var exceptionHandlingAttribute = new ExceptionHandlingAttribute();
exceptionHandlingAttribute.OnException(httpActionExectuedContext);
Assert.Equal(actionContext.Response.StatusCode, statusCode);
Assert.Equal(actionContext.Response.ReasonPhrase, ex.Message);
}
public static IEnumerable<object[]> ExceptionData
{
get
{
return new[]
{
new object[] { new TimeoutException("My timeout message."), HttpStatusCode.RequestTimeout }
};
}
}
My problem is : Assert.Equal(actionContext.Response.ReasonPhrase, ex.Message);
When I try to look at it in the watch window, I can't seem to find "My Timeout message" in the response.
UPDATE:
actionContext.Response.ReasonPhrase = "Request Timeout"
ex.Message = "My timeout message"

Answer 1

The message portion of the CreateErrorResponse isn't a property, you have to read the content to get the value. Here's what I did...
var responseContent = await actionContext.Response.Content.ReadAsStringAsync();
After reading, responseContent now had:
{ "message" : "My timeout message." }