private <T> void verifyFailsWithQuotaException(Callable<T> callable, String operationDesc) throws Exception {
    try {
      callable.call();
      Assert.fail(operationDesc + " should have failed with QuotaException");
    } catch (QuotaException quotaException) {
    }
  }
Verify that the specified {@link Callable} fails with {@link QuotaException}.
@param callable {@link Callable} that is expected to fail.
@param operationDesc description of the operation performed by callable.
@param <T> the result of the specified {@link Callable}.
@throws Exception in case any exception other than {@link QuotaException} is thrown.
ambry-quota/src/test/java/com/github/ambry/quota/capacityunit/AmbryCUQuotaSourceTest.java