public void CorrelationCanBeNull()
{
var exception = new ArgumentException("Test");
var httpRequestMessage = new HttpRequestMessage(HttpMethod.Get, "http://www.server.domain");
var httpRouteData = new HttpRouteData(new HttpRoute());
var httpControllerContext = new HttpControllerContext(new HttpConfiguration(), httpRouteData, httpRequestMessage);
var actionContext = new HttpActionContext(httpControllerContext, new ReflectedHttpActionDescriptor());
actionContext.ActionArguments.Add("Key1", "Value1");
actionContext.ActionArguments.Add("Key2", "Value2");
var exceptionContext = new ExceptionContext(exception, new ExceptionContextCatchBlock("TestBlock", false, false), actionContext);
var loggerContext = new ExceptionLoggerContext(exceptionContext);
sut = new RequestErrorLogger(loggerFactory, request => null);
sut.Log(loggerContext);
logger.Received().LogError(null, exception, "Unhandled exception from request: {0}({1})", httpRequestMessage, "Key1: Value1, Key2: Value2");
}