static W3CSpanContextPropagatorTests()
 {
     W3CPropagator = ContextPropagators.GetSpanContextPropagator(new[] { nameof(ContextPropagators.Names.W3C) }, new[] { nameof(ContextPropagators.Names.W3C) });
 }
 static B3SpanContextPropagatorTests()
 {
     B3Propagator = ContextPropagators.GetSpanContextPropagator(new[] { nameof(ContextPropagators.Names.B3) }, new[] { nameof(ContextPropagators.Names.B3) });
 }
        static MultiSpanContextPropagatorTests()
        {
            var names = Enum.GetNames(typeof(ContextPropagators.Names));

            Propagator = ContextPropagators.GetSpanContextPropagator(names, names);
        }