@Test void getTraces_whenMissingTimestamps() throws IOException {
    Span span = Span.newBuilder().traceId("1").id("1").name("foo").build();
    // write the span to the zipkin using http
    assertPostSpansV1Success(span);

    // read the traces directly
    assertThat(zipkin.getTraces()).containsOnly(List.of(span));
  }
The rule is here to help debugging. Even partial spans should be returned
zipkin-junit5/src/test/java/zipkin2/junit5/ZipkinExtensionTest.java