### Question:
UrlGroup { public String getGroupId() { return mGroupId; } UrlGroup(String groupId); String getGroupId(); void addPair(PwPair pwPair); PwPair getTopPair(Comparator<PwPair> comparator);  }### Answer:
@Test public void constructorCreatesProperObject() { UrlGroup urlGroup = new UrlGroup(GROUPID1); assertEquals(urlGroup.getGroupId(), GROUPID1); }