private void assertFragmentationStatOnVm(final VM vm, final int fragmentation,
      final ASSERT_OP op) {
    vm.invoke(() -> assertFragmentationStat(fragmentation, op));
  }
Asserts that the fragmentation stat is available and satisfies an assert operation.

@param vm a virtual machine
@param fragmentation a fragmentation percentage
@param op an assertion operation
geode-core/src/distributedTest/java/org/apache/geode/management/OffHeapManagementDUnitTest.java