@Test void whenNoServiceLabelsExist_kindIsUnknown() {
    DependencyLinkV2SpanIterator iterator =
        iterator(newRecord().values(traceIdHigh, traceId, parentId, spanId, "cs", -1, null));

    Span span = iterator.next();
    assertThat(span.kind()).isNull();
    assertThat(span.localEndpoint()).isNull();
    assertThat(span.remoteEndpoint()).isNull();
  }
You cannot make a dependency link unless you know the the local or peer endpoint.
zipkin-storage/mysql-v1/src/test/java/zipkin2/storage/mysql/v1/DependencyLinkV2SpanIteratorTest.java