@Test
  public void testReplace() {
    CopyOnWriteHashMap map = map5();
    assertNull(map.replace(six, "Z"));
    assertFalse(map.containsKey(six));
  }
replace fails when the given key is not present
geode-core/src/integrationTest/java/org/apache/geode/internal/util/concurrent/CopyOnWriteHashMapJUnitTest.java