@Test
  public void testGetCUQuotasFromJsonForEmptyJsonString() throws IOException, AccountServiceException {
    InMemAccountService accountService = new InMemAccountService(false, false);
    ObjectMapper objectMapper = new ObjectMapper();
    Map<String, JsonCUQuotaDataProviderUtil.MapOrQuota> testQuotas =
        objectMapper.readValue(EMPTY_JSON, new TypeReference<Map<String, JsonCUQuotaDataProviderUtil.MapOrQuota>>() {
        });
    for (String s : testQuotas.keySet()) {
      accountService.updateAccounts(Collections.singletonList(createAccountForQuota(testQuotas.get(s), s)));
    }
    Map<String, CapacityUnit> quotas = JsonCUQuotaDataProviderUtil.getCUQuotasFromJson(EMPTY_JSON, accountService);

    Assert.assertEquals(0, quotas.size());
  }
Create a {@link Container} with the specified containerId.
@param containerId id of the container.
@return Container object.
ambry-quota/src/test/java/com/github/ambry/quota/capacityunit/JsonCUQuotaDataProviderUtilTest.java