@Test void whenSrServiceExists_kindIsServer() {
    DependencyLinkV2SpanIterator iterator =
        iterator(newRecord().values(traceIdHigh, traceId, parentId, spanId, "sr", -1, "service"));
    Span span = iterator.next();

    assertThat(span.kind()).isEqualTo(Span.Kind.SERVER);
    assertThat(span.localServiceName()).isEqualTo("service");
    assertThat(span.remoteEndpoint()).isNull();
  }
"sr" is only applied when the local span is acting as a server
zipkin-storage/mysql-v1/src/test/java/zipkin2/storage/mysql/v1/DependencyLinkV2SpanIteratorTest.java