1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/pylint-dev/pylint/blob/main/LICENSE
# Copyright (c) https://github.com/pylint-dev/pylint/blob/main/CONTRIBUTORS.txt
import astroid
import pytest
from pylint.checkers import typecheck
from pylint.interfaces import INFERENCE, UNDEFINED
from pylint.testutils import CheckerTestCase, MessageTest, set_config
try:
from coverage import tracer as _
C_EXTENTIONS_AVAILABLE = True
except ImportError:
_ = None
C_EXTENTIONS_AVAILABLE = False
needs_c_extension = pytest.mark.skipif(
not C_EXTENTIONS_AVAILABLE, reason="Requires coverage (source of C-extension)"
)
class TestTypeChecker(CheckerTestCase):
"""Tests for pylint.checkers.typecheck."""
CHECKER_CLASS = typecheck.TypeChecker
@set_config(suggestion_mode=False)
@needs_c_extension
def test_nomember_on_c_extension_error_msg(self) -> None:
node = astroid.extract_node(
"""
from coverage import tracer
tracer.CTracer #@
"""
)
message = MessageTest(
"no-member",
node=node,
args=("Module", "coverage.tracer", "CTracer", ""),
confidence=INFERENCE,
line=3,
col_offset=0,
end_line=3,
end_col_offset=14,
)
with self.assertAddsMessages(message):
self.checker.visit_attribute(node)
@set_config(suggestion_mode=True)
@needs_c_extension
def test_nomember_on_c_extension_info_msg(self) -> None:
node = astroid.extract_node(
"""
from coverage import tracer
tracer.CTracer #@
"""
)
message = MessageTest(
"c-extension-no-member",
node=node,
args=("Module", "coverage.tracer", "CTracer", ""),
confidence=INFERENCE,
line=3,
col_offset=0,
end_line=3,
end_col_offset=14,
)
with self.assertAddsMessages(message):
self.checker.visit_attribute(node)
class TestTypeCheckerOnDecorators(CheckerTestCase):
"""Tests for pylint.checkers.typecheck on decorated functions."""
CHECKER_CLASS = typecheck.TypeChecker
def test_issue3882_class_decorators(self) -> None:
decorators = """
class Unsubscriptable:
def __init__(self, f):
self.f = f
class Subscriptable:
def __init__(self, f):
self.f = f
def __getitem__(self, item):
return item
"""
for generic in "Optional", "List", "ClassVar", "Final", "Literal":
self.typing_objects_are_subscriptable(generic)
self.getitem_on_modules()
self.decorated_by_a_subscriptable_class(decorators)
self.decorated_by_an_unsubscriptable_class(decorators)
self.decorated_by_subscriptable_then_unsubscriptable_class(decorators)
self.decorated_by_unsubscriptable_then_subscriptable_class(decorators)
def getitem_on_modules(self) -> None:
"""Mainly validate the code won't crash if we're not having a function."""
module = astroid.parse(
"""
import collections
test = collections[int]
"""
)
subscript = module.body[-1].value
with self.assertAddsMessages(
MessageTest(
"unsubscriptable-object",
node=subscript.value,
args="collections",
confidence=UNDEFINED,
line=3,
col_offset=7,
end_line=3,
end_col_offset=18,
)
):
self.checker.visit_subscript(subscript)
def typing_objects_are_subscriptable(self, generic: str) -> None:
module = astroid.parse(
f"""
import typing
test = typing.{generic}[int]
"""
)
subscript = module.body[-1].value
with self.assertNoMessages():
self.checker.visit_subscript(subscript)
def decorated_by_a_subscriptable_class(self, decorators: str) -> None:
module = astroid.parse(
decorators
+ """
@Subscriptable
def decorated():
...
test = decorated[None]
"""
)
subscript = module.body[-1].value
with self.assertNoMessages():
self.checker.visit_subscript(subscript)
def decorated_by_subscriptable_then_unsubscriptable_class(
self, decorators: str
) -> None:
module = astroid.parse(
decorators
+ """
@Unsubscriptable
@Subscriptable
def decorated():
...
test = decorated[None]
"""
)
subscript = module.body[-1].value
with self.assertAddsMessages(
MessageTest(
"unsubscriptable-object",
node=subscript.value,
args="decorated",
confidence=UNDEFINED,
line=18,
col_offset=7,
end_line=18,
end_col_offset=16,
)
):
self.checker.visit_subscript(subscript)
def decorated_by_unsubscriptable_then_subscriptable_class(
self, decorators: str
) -> None:
module = astroid.parse(
decorators
+ """
@Subscriptable
@Unsubscriptable
def decorated():
...
test = decorated[None]
"""
)
subscript = module.body[-1].value
with self.assertNoMessages():
self.checker.visit_subscript(subscript)
def decorated_by_an_unsubscriptable_class(self, decorators: str) -> None:
module = astroid.parse(
decorators
+ """
@Unsubscriptable
def decorated():
...
test = decorated[None]
"""
)
subscript = module.body[-1].value
with self.assertAddsMessages(
MessageTest(
"unsubscriptable-object",
node=subscript.value,
args="decorated",
confidence=UNDEFINED,
line=17,
col_offset=7,
end_line=17,
end_col_offset=16,
)
):
self.checker.visit_subscript(subscript)
|
