| # Copyright 2019 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| import unittest |
| |
| from .composition_parts import Component |
| from .composition_parts import Identifier |
| from .make_copy import make_copy |
| |
| |
| class MakeCopyTest(unittest.TestCase): |
| def test_primitives(self): |
| self.assertEqual(None, make_copy(None)) |
| self.assertEqual(True, make_copy(True)) |
| self.assertEqual(False, make_copy(False)) |
| self.assertEqual(42, make_copy(42)) |
| self.assertEqual(3.14, make_copy(3.14)) |
| self.assertEqual('abc', make_copy('abc')) |
| |
| def test_primitives_subclasses(self): |
| # Identifier and Component are subclasses of str. Copies of them |
| # shouldn't change their type. |
| original = (Identifier('x'), Component('x')) |
| copy = make_copy(original) |
| self.assertEqual(original[0], copy[0]) |
| self.assertEqual(original[1], copy[1]) |
| self.assertIsInstance(copy[0], Identifier) |
| self.assertIsInstance(copy[1], Component) |
| |
| def test_object_identity(self): |
| # A diamond structure must be preserved when making a copy. |
| # /--> B --\ |
| # A --> D |
| # \--> C --/ |
| # A1->B1, A1->C1, B1->D1, C1->D1 will be copied as; |
| # A2->B2, A2->C2, B2->D2, C2->D2 where X2 is a copy of X1. |
| |
| class Obj(object): |
| pass |
| |
| class Ref(object): |
| def __init__(self, value=None): |
| self.value = value |
| |
| obj = Obj() |
| ref1 = Ref(obj) |
| ref2 = Ref(obj) |
| self.assertNotEqual(ref1, ref2) |
| self.assertIs(ref1.value, ref2.value) |
| |
| copy = make_copy((ref1, ref2)) |
| self.assertIsInstance(copy, tuple) |
| self.assertIsInstance(copy[0], Ref) |
| self.assertIsInstance(copy[1], Ref) |
| self.assertIsNot(copy[0], copy[1]) |
| self.assertIs(copy[0].value, copy[1].value) |
