public void TraceWarning()
{
const String traceErrorMessage = "VSOutputEnhancerDemo.vshost.exe Warning: 0 : Trace warning message\r\n";
var span = Utils.CreateSpan(traceErrorMessage);
var classifier = CreateClassifier();
var result = classifier.GetClassificationSpans(span);
Assert.AreEqual(1, result.Count);
var classificationSpan = result.Single();
Assert.AreEqual(new SnapshotSpan(span.Snapshot, 32, 34), classificationSpan.Span);
Assert.AreEqual(ClassificationType.DebugTraceWarning, classificationSpan.ClassificationType.Classification);
}