def testLoop(self): # No Loops input1 = Tree(children=TreeTest.tree_layout) input2 = Tree(children=TreeTest.tree_layout_2) input3 = Tree(children=TreeTest.tree_layout_3) self.assertFalse(input1.has_loop()) self.assertFalse(input2.has_loop()) self.assertFalse(input3.has_loop()) input1.append(input2) self.assertFalse(input1.has_loop()) # Loops input2.append(input1) input1.append(input2) self.assertTrue(input1.has_loop()) input4 = Tree(children=TreeTest.tree_layout) input5 = Tree(children=TreeTest.tree_layout_2) input6 = Tree(children=TreeTest.tree_layout_3) input6.append(input4) input4.append(input5) input5.append(input6) self.assertTrue(input4.has_loop()) self.assertTrue(input5.has_loop()) self.assertTrue(input6.has_loop())