[Python-checkins] Clean up and enhance frozen dataclass tests. (GH-6380)
Eric V. Smith
webhook-mailer at python.org
Thu Apr 5 06:50:26 EDT 2018
https://github.com/python/cpython/commit/74940913d26d9f94b8572eca794369841fa6d9b6
commit: 74940913d26d9f94b8572eca794369841fa6d9b6
branch: master
author: Eric V. Smith <ericvsmith at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2018-04-05T06:50:18-04:00
summary:
Clean up and enhance frozen dataclass tests. (GH-6380)
* Add a test for frozen with unhashable field value.
* Improve a comment.
files:
M Lib/test/test_dataclasses.py
diff --git a/Lib/test/test_dataclasses.py b/Lib/test/test_dataclasses.py
index 26bfc4e75a00..2c890a2cbe92 100755
--- a/Lib/test/test_dataclasses.py
+++ b/Lib/test/test_dataclasses.py
@@ -2191,33 +2191,6 @@ def __repr__(self):
self.assertEqual(repr(C(0)), 'x')
-class TestFrozen(unittest.TestCase):
- def test_overwriting_frozen(self):
- # frozen uses __setattr__ and __delattr__.
- with self.assertRaisesRegex(TypeError,
- 'Cannot overwrite attribute __setattr__'):
- @dataclass(frozen=True)
- class C:
- x: int
- def __setattr__(self):
- pass
-
- with self.assertRaisesRegex(TypeError,
- 'Cannot overwrite attribute __delattr__'):
- @dataclass(frozen=True)
- class C:
- x: int
- def __delattr__(self):
- pass
-
- @dataclass(frozen=False)
- class C:
- x: int
- def __setattr__(self, name, value):
- self.__dict__['x'] = value * 2
- self.assertEqual(C(10).x, 20)
-
-
class TestEq(unittest.TestCase):
def test_no_eq(self):
# Test a class with no __eq__ and eq=False.
@@ -2672,6 +2645,44 @@ class S(D):
self.assertEqual(s.y, 10)
self.assertEqual(s.cached, True)
+ def test_overwriting_frozen(self):
+ # frozen uses __setattr__ and __delattr__.
+ with self.assertRaisesRegex(TypeError,
+ 'Cannot overwrite attribute __setattr__'):
+ @dataclass(frozen=True)
+ class C:
+ x: int
+ def __setattr__(self):
+ pass
+
+ with self.assertRaisesRegex(TypeError,
+ 'Cannot overwrite attribute __delattr__'):
+ @dataclass(frozen=True)
+ class C:
+ x: int
+ def __delattr__(self):
+ pass
+
+ @dataclass(frozen=False)
+ class C:
+ x: int
+ def __setattr__(self, name, value):
+ self.__dict__['x'] = value * 2
+ self.assertEqual(C(10).x, 20)
+
+ def test_frozen_hash(self):
+ @dataclass(frozen=True)
+ class C:
+ x: Any
+
+ # If x is immutable, we can compute the hash. No exception is
+ # raised.
+ hash(C(3))
+
+ # If x is mutable, computing the hash is an error.
+ with self.assertRaisesRegex(TypeError, 'unhashable type'):
+ hash(C({}))
+
class TestSlots(unittest.TestCase):
def test_simple(self):
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