@Test void client_missingCs() {
    Span v2 =
      Span.newBuilder()
        .traceId("1")
        .id("2")
        .name("get")
        .kind(Kind.CLIENT)
        .localEndpoint(FRONTEND)
        .timestamp(1472470996199000L)
        .duration(207000L)
        .build();

    V1Span v1 =
      V1Span.newBuilder()
        .traceId("1")
        .id("2")
        .name("get")
        .timestamp(1472470996199000L)
        .duration(207000L)
        .addAnnotation(1472470996406000L, "cs", FRONTEND)
        .build();

    assertThat(v1SpanConverter.convert(v1)).containsExactly(v2);
  }
Fix a v1 reported half in new style and half in old style, ex via a bridge
zipkin/src/test/java/zipkin2/v1/SpanConverterTest.java