### Question:
GroupKeyInfoItemIdentifier extends BaseInfoItemIdentifier { public long getGroupId() { return _groupId; } GroupKeyInfoItemIdentifier(long groupId, String key); @Override boolean equals(Object object); long getGroupId(); String getKey(); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void testGetGroupId() { GroupKeyInfoItemIdentifier groupKeyInfoItemIdentifier = new GroupKeyInfoItemIdentifier(12345L, "key"); Assert.assertEquals(12345L, groupKeyInfoItemIdentifier.getGroupId()); }