@Test protected void getTrace_returnsEmptyOnNotFound(TestInfo testInfo) throws Exception {
    String testSuffix = testSuffix(testInfo);
    Span clientSpan = newClientSpan(testSuffix);

    assertGetTraceReturnsEmpty(clientSpan.traceId());

    accept(clientSpan);

    assertGetTraceReturns(clientSpan);

    assertGetTraceReturnsEmpty(clientSpan.traceId().substring(16));
  }
Base test for {@link Traces}.

<p>Subtypes should create a connection to a real backend, even if that backend is in-process.
zipkin-tests/src/main/java/zipkin2/storage/ITTraces.java