@Test
  public void testConstructor3() {
    try {
      new CustomEntryConcurrentHashMap(-1);
      shouldThrow();
    } catch (IllegalArgumentException ignored) {
    }
  }
Cannot create with only negative capacity
geode-core/src/integrationTest/java/org/apache/geode/internal/util/concurrent/cm/ConcurrentHashMapJUnitTest.java