}
public void testLastChainedOperation() throws Exception {
Frame home = assertHasFrame(root, "Home");
BuiltinOperation o1 = assertHasBuiltinOperation(home, "o1");
BuiltinOperation o2 = assertHasBuiltinOperation(home, "o2");
BuiltinOperation o3 = assertHasBuiltinOperation(home, "o3");
BuiltinOperation o4 = assertHasBuiltinOperation(home, "o4");
assertEquals(o3, getHelper().lastChainedOperation(o1));
assertEquals(o3, getHelper().lastChainedOperation(o2));
assertEquals(o3, getHelper().lastChainedOperation(o3));
assertEquals(o4, getHelper().lastChainedOperation(o4));