public void EndClientSpan_NullClientTrace_DoesntThrow()
{
var returnCode = fixture.Create <short>();
var tracerClient = SetupZipkinClient();
spanTracerStub = GetSpanTracerStub();
var called = false;
spanTracerStub.Stub(x => x.ReceiveClientSpan(Arg <Span> .Is.Anything, Arg <short> .Is.Equal(returnCode)))
.WhenCalled(x => { called = true; });
tracerClient.EndClientTrace(null, returnCode);
Assert.IsFalse(called);
}