@Test void buildDefaultBuilder() {

  KafkaStorageBuilder builder = KafkaStorage.newBuilder();
  assertThatThrownBy(() -> builder.spanPartitioning.spansTopic(null))
      .isInstanceOf(NullPointerException.class);
  assertThatThrownBy(() -> builder.spanAggregation.spansTopic(null))
      .isInstanceOf(NullPointerException.class);
  assertThatThrownBy(() -> builder.spanAggregation.traceTopic(null))
      .isInstanceOf(NullPointerException.class);
  assertThatThrownBy(() -> builder.spanAggregation.dependencyTopic(null))
      .isInstanceOf(NullPointerException.class);
  assertThatThrownBy(() -> builder.traceStorage.spansTopic(null))
      .isInstanceOf(NullPointerException.class);
  assertThatThrownBy(() -> builder.dependencyStorage.dependencyTopic(null))
      .isInstanceOf(NullPointerException.class);
  assertThatThrownBy(() -> builder.storageStateDir(null))
      .isInstanceOf(NullPointerException.class);
}