@Test public void handleReceive_finishesSpanEvenIfUnwrappedNull() {

  brave.Span span = mock(brave.Span.class);
  when(span.context()).thenReturn(context);
  when(span.customizer()).thenReturn(span);
  handler.handleReceive(mock(RpcClientResponse.class), span);
  verify(span).isNoop();
  verify(span).context();
  verify(span).customizer();
  verify(span).finish();
  verifyNoMoreInteractions(span);
}