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