### Question:
AbstractContact implements IContact { public boolean isUnknown() { return unknown; }  boolean isUnknown(); void setUnknown(boolean unknown); boolean isNewbie(); void setNewbie(boolean newbie); IMessage getLastMessage(); void setLastMessage(IMessage lastMessage); int getUnread(); void setUnread(int unread); void clearUnRead(); void increaceUnRead(); int compareTo(AbstractContact that);  }### Answer:
@Test public void testIsUnknown() { assertEquals(false, contact.isUnknown()); }