private void validateParallelAsyncEventQueueSize(int expectedRegionQueueSize) {
    InternalGatewaySender gatewaySender = getInternalGatewaySender();

    Set<RegionQueue> regionQueues = gatewaySender.getQueues();
    assertThat(regionQueues).isNotEmpty().hasSize(1);

    Region<?, ?> region = regionQueues.iterator().next().getRegion();
    assertThat(region.size()).isEqualTo(expectedRegionQueueSize);
  }
Added for defect #50364 Can't colocate region that has AEQ with a region that does not have
that same AEQ

TRAC #50364:
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/wan/asyncqueue/ParallelAsyncEventListenerDistributedTest.java