@Override
      public Object call() throws Exception {
        final Region r = getCache().getRegion(REP_REG_NAME);
        final Region pr = getCache().getRegion(PR_REG_NAME);
        assertEquals(r.get("createKey"), r.get("putAbsentKey"));
        assertEquals(pr.get("createKey"), pr.get("putAbsentKey"));
        assertFalse(r.containsKey("createKey"));
        assertFalse(pr.containsKey("createKey"));
        assertEquals(r.containsKey("createKey"), r.containsKey("putAbsentKey"));
        assertEquals(pr.containsKey("createKey"), pr.containsKey("putAbsentKey"));
        return null;
      }
tests for the concurrentMapOperations. there are more tests in ClientServerMiscDUnitTest
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ConcurrentMapOpsDUnitTest.java