public void TestProfilingSessionExtensions_AddTag_InvalidTag()
{
// mock profiler
var profilerId = Guid.NewGuid();
var mockProfiler = new Mock <IProfiler>();
var timingSession = new TimingSession(mockProfiler.Object, "test", null);
mockProfiler.Setup(p => p.Id).Returns(profilerId);
mockProfiler.Setup(p => p.GetTimingSession()).Returns(timingSession);
var target = new ProfilingSession(mockProfiler.Object);
target.AddTag("");
Assert.IsNull(timingSession.Tags);
}