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bpo-32427: Expose dataclasses.MISSING object. (#5045)

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Eric V. Smith 2017-12-29 13:59:58 -05:00 • committed by GitHub
parent e325608740
commit 03220fdb26
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2 changed files with 70 additions and 23 deletions
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52
Lib/test/test_dataclasses.py
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@ -1,6 +1,6 @@
from dataclasses import (
dataclass, field, FrozenInstanceError, fields, asdict, astuple,
make_dataclass, replace, InitVar, Field
make_dataclass, replace, InitVar, Field, MISSING
)
import pickle
@ -917,12 +917,12 @@ class TestCase(unittest.TestCase):
param = next(params)
self.assertEqual(param.name, 'k')
self.assertIs (param.annotation, F)
# Don't test for the default, since it's set to _MISSING
# Don't test for the default, since it's set to MISSING
self.assertEqual(param.kind, inspect.Parameter.POSITIONAL_OR_KEYWORD)
param = next(params)
self.assertEqual(param.name, 'l')
self.assertIs (param.annotation, float)
# Don't test for the default, since it's set to _MISSING
# Don't test for the default, since it's set to MISSING
self.assertEqual(param.kind, inspect.Parameter.POSITIONAL_OR_KEYWORD)
self.assertRaises(StopIteration, next, params)
@ -948,6 +948,52 @@ class TestCase(unittest.TestCase):
validate_class(C)
def test_missing_default(self):
# Test that MISSING works the same as a default not being
# specified.
@dataclass
class C:
x: int=field(default=MISSING)
with self.assertRaisesRegex(TypeError,
r'__init__\(\) missing 1 required '
'positional argument'):
C()
self.assertNotIn('x', C.__dict__)
@dataclass
class D:
x: int
with self.assertRaisesRegex(TypeError,
r'__init__\(\) missing 1 required '
'positional argument'):
D()
self.assertNotIn('x', D.__dict__)
def test_missing_default_factory(self):
# Test that MISSING works the same as a default factory not
# being specified (which is really the same as a default not
# being specified, too).
@dataclass
class C:
x: int=field(default_factory=MISSING)
with self.assertRaisesRegex(TypeError,
r'__init__\(\) missing 1 required '
'positional argument'):
C()
self.assertNotIn('x', C.__dict__)
@dataclass
class D:
x: int=field(default=MISSING, default_factory=MISSING)
with self.assertRaisesRegex(TypeError,
r'__init__\(\) missing 1 required '
'positional argument'):
D()
self.assertNotIn('x', D.__dict__)
def test_missing_repr(self):
self.assertIn('MISSING_TYPE object', repr(MISSING))
def test_dont_include_other_annotations(self):
@dataclass
class C: