@Override
    public void afterRegionInvalidate(RegionEvent revt) {
      fail("Unexpected listener callback: afterRegionInvalidate");
    }
is called when a region is invalidated.

@param revt a RegionEvent to represent the source region.
@throws CacheException if any error occurs.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/SystemFailureDUnitTest.java