@Test
  public void findByMeterReadingId_returnsIntervalBlocks() {
    MeterReading meterReading = new MeterReading();
    meterReading.setUUID(UUID.randomUUID());

    IntervalBlock intervalBlock = new IntervalBlock();
    intervalBlock.setUUID(UUID.randomUUID());

    IntervalBlock intervalBlock1 = new IntervalBlock();
    intervalBlock1.setUUID(UUID.randomUUID());

    meterReading.addIntervalBlock(intervalBlock);
    meterReading.addIntervalBlock(intervalBlock1);

    meterReadingRepository.persist(meterReading);

    assertEquals(2, repository.findAllByMeterReadingId(meterReading.getId()).size());
  }