@Test void span_minimum_JSON_V2() {
    span =
        Span.newBuilder()
            .traceId("7180c278b62e8f6a216a2aea45d08fc9")
            .id("5b4185666d50f68b")
            .build();

    assertThat(new String(SpanBytesEncoder.JSON_V2.encode(span), UTF_8))
        .isEqualTo(
            "{\"traceId\":\"7180c278b62e8f6a216a2aea45d08fc9\",\"id\":\"5b4185666d50f68b\"}");
  }
the following skeletal span is used in dependency linking
zipkin/src/test/java/zipkin2/codec/SpanBytesEncoderTest.java