public static void localInvalidateEntry(String key) throws Exception {
    try {
      Region r = cache.getRegion(SEPARATOR + REGION_NAME);
      assertNotNull(r);
      r.put(key, "DummyValue");
      r.localInvalidate(key);
    } catch (Exception e) {
      Assert.fail("test failed due to ", e);
    }
  }
Tests that the Matris defined in <code>ServerResponseMatrix</code> is applied or not

@since GemFire 5.1
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/DurableResponseMatrixDUnitTest.java