Revert "add regression test:"
Revert "add regression test:"

This reverts commit c705afa887978a87136b0d0ebce02572dc127612.

lightstep/lightstep-tracer-cpp,lightstep/lightstep-tracer-cpp,lightstep/lightstep-tracer-cpp,lightstep/lightstep-tracer-cpp,lightstep/lightstep-tracer-cpp