def METHOD_NAME(self):
    """NoOpTracer's start_span will also
    be retrievable via get_current_span
    """
    self.assertEqual(trace.get_current_span(), trace.INVALID_SPAN)
    span = trace.NonRecordingSpan(trace.INVALID_SPAN_CONTEXT)
    ctx = trace.set_span_in_context(span)
    token = context.attach(ctx)
    try:
        self.assertIs(trace.get_current_span(), span)
    finally:
        context.detach(token)
    self.assertEqual(trace.get_current_span(), trace.INVALID_SPAN)