@Test
public void testInstrumentedRunnableNoCurrentSpan() {

    when(traceContext.isEmpty()).thenReturn(true);
    Runnable wrappedRunnable = mock(Runnable.class);
    SofaTracerRunnable runnable = new SofaTracerRunnable(wrappedRunnable, traceContext);
    runnable.run();
    verify(traceContext, times(1)).isEmpty();
    verify(wrappedRunnable, times(1)).run();
    verifyNoMoreInteractions(traceContext, wrappedRunnable);
}