### Question:
ConfigKeyGroup { public static ConfigKeyGroupBuilder builder(String name) { return internalBuilder().name(name); }  static ConfigKeyGroupBuilder builder(String name); @Override boolean equals(Object o); @Override int hashCode(); static final Comparator<ConfigKeyGroup> ORDERING; static final ConfigKeyGroup DEFAULT; }### Answer:
@Test public void testOrdering() { ConfigKeyGroup grp10 = ConfigKeyGroup.builder("group1") .order(0) .build(); ConfigKeyGroup grp20 = ConfigKeyGroup.builder("group2") .order(0) .build(); ConfigKeyGroup grp21 = ConfigKeyGroup.builder("group2") .order(1) .build(); assertTrue(ConfigKeyGroup.ORDERING.compare(grp10, grp20) < 0); assertTrue(ConfigKeyGroup.ORDERING.compare(grp20, grp21) < 0); }