@Test
  public void testReplaceValue2() {
    CustomEntryConcurrentHashMap map = map5();
    assertEquals("A", map.get(one));
    assertTrue(map.replace(one, "A", "Z"));
    assertEquals("Z", map.get(one));
  }
replace value succeeds when the given key mapped to expected value
geode-core/src/integrationTest/java/org/apache/geode/internal/util/concurrent/cm/ConcurrentHashMapJUnitTest.java