// =====================================================================
Group group1 = group.addGroup("group1", builderMock);
assertSame(group1, group1Mock);
Group group2 = group.addGroup("group2", builderMock);
assertSame(group2, group2Mock);
try {
group1 = group.addGroup("group1", builderMock);
fail("Did not detect attempt to add same group multiple times");