### Question:
SimpleSpanProcessor implements SpanProcessor { @Override public void onStart(ReadWriteSpan span) { } private  SimpleSpanProcessor(SpanExporter spanExporter, boolean sampled); @Override void onStart(ReadWriteSpan span); @Override boolean isStartRequired(); @Override void onEnd(ReadableSpan span); @Override boolean isEndRequired(); @Override CompletableResultCode shutdown(); @Override CompletableResultCode forceFlush(); static Builder newBuilder(SpanExporter spanExporter);  }### Answer:
@Test void onStartSync() { simpleSampledSpansProcessor.onStart(readWriteSpan); verifyNoInteractions(spanExporter); }