Additional tests for pylint-dev/astroid#1126

tests/functional/d/dataclass_with_default_factory.py

@@ -1,6 +1,9 @@
-"""A test script the confuses pylint."""
-# https://github.com/PyCQA/pylint/issues/2605
+"""Various regression tests for dataclasses."""
+# See issues:
+# - https://github.com/PyCQA/pylint/issues/2605
+# - https://github.com/PyCQA/pylint/issues/2698
 from dataclasses import dataclass, field
+import dataclasses as dc
 
 
 @dataclass
@@ -13,3 +16,28 @@ class Test:
 TEST = Test()
 TEST.test.append(1)
 print(TEST.test[0])
+
+
+@dc.dataclass  # Note the use of dc instead of dataclasses
+class Test2:
+    """Test dataclass that uses a renamed import of dataclasses"""
+    int_prop: int = dc.field(default=10)
+    list_prop: list = dc.field(default_factory=list)
+    dict_prop: dict = dc.field(default_factory=dict)
+
+
+TEST2 = Test2()
+for _ in TEST2.list_prop:  # This is okay
+    pass
+
+
+TEST2.dict_prop["key"] = "value"  # This is okay
+
+
+# Test2.int_prop is inferred as 10, not a Field
+print(Test2.int_prop + 1)
+for _ in Test2.int_prop:  # [not-an-iterable]
+    pass
+
+
+Test2.int_prop["key"] = "value"  # [unsupported-assignment-operation]

tests/functional/d/dataclass_with_default_factory.txt

@@ -0,0 +1,2 @@
+not-an-iterable:39:9::Non-iterable value Test2.int_prop is used in an iterating context:HIGH
+unsupported-assignment-operation:43:0::'Test2.int_prop' does not support item assignment:HIGH

tests/functional/i/invalid/invalid_name_issue_3405.py

@@ -0,0 +1,11 @@
+""" Regression test for https://github.com/PyCQA/pylint/issues/3405. """
+
+import dataclasses
+from typing import ClassVar
+
+
+@dataclasses.dataclass
+class Foo:
+    """ClassVar attribute should be matched against class-attribute-rgx, not attr-rgx"""
+    # class-attribute-rgx='^y$'
+    x: ClassVar[int] = 0  # [invalid-name]

tests/functional/i/invalid/invalid_name_issue_3405.rc

@@ -0,0 +1,9 @@
+[MESSAGES CONTROL]
+enable=invalid-name
+
+[BASIC]
+attr-rgx=^x$
+class-attribute-rgx=^y$
+
+[testoptions]
+min_pyver=3.7

tests/functional/i/invalid/invalid_name_issue_3405.txt

@@ -0,0 +1 @@
+invalid-name:11:4:Foo:"Class attribute name ""x"" doesn't conform to '^y$' pattern":HIGH

tests/functional/n/no/no_member_dataclasses.py

@@ -0,0 +1,83 @@
+"""Test various regressions for dataclasses and no-member.
+"""
+# pylint: disable=missing-docstring, too-few-public-methods
+from abc import ABCMeta, abstractmethod
+from dataclasses import asdict, dataclass, field
+from typing import Any, Dict
+
+
+# https://github.com/PyCQA/pylint/issues/3754
+@dataclass(frozen=True)
+class DeploymentState(metaclass=ABCMeta):
+    type: str
+
+    @abstractmethod
+    def to_dict(self) -> Dict:
+        """
+        Serializes given DeploymentState instance to Dict.
+        :return:
+        """
+
+
+@dataclass(frozen=True)
+class DeploymentStateEcs(DeploymentState):
+    blue: Any
+    green: Any
+    candidate: Any
+
+    def to_dict(self) -> Dict:
+        return {
+            'type': self.type,  # No error here
+            'blue': asdict(self.blue),
+            'green': asdict(self.green),
+            'candidate': self.candidate.value,
+        }
+
+
+@dataclass(frozen=True)
+class DeploymentStateLambda(DeploymentState):
+    current: Any
+    candidate: Any
+
+    def to_dict(self) -> Dict:
+        return {
+            'type': self.type,  # No error here
+            'current': asdict(self.current),
+            'candidate': asdict(self.candidate) if self.candidate else None,
+        }
+
+
+# https://github.com/PyCQA/pylint/issues/2600
+@dataclass
+class TestClass:
+    attr1: str
+    attr2: str
+    dict_prop: Dict[str, str] = field(default_factory=dict)
+
+    def some_func(self) -> None:
+        for key, value in self.dict_prop.items():  # No error here
+            print(key)
+            print(value)
+
+
+class TestClass2:  # not a dataclass, field inferred to a Field
+    attr1: str
+    attr2: str
+    dict_prop: Dict[str, str] = field(default_factory=dict)
+
+    def some_func(self) -> None:
+        for key, value in self.dict_prop.items():  # [no-member]
+            print(key)
+            print(value)
+
+
+@dataclass
+class TestClass3:
+    attr1: str
+    attr2: str
+    dict_prop = field(default_factory=dict)  # No type annotation, not treated as field
+
+    def some_func(self) -> None:
+        for key, value in self.dict_prop.items():  # [no-member]
+            print(key)
+            print(value)

tests/functional/n/no/no_member_dataclasses.rc

@@ -0,0 +1,2 @@
+[testoptions]
+min_pyver=3.7

tests/functional/n/no/no_member_dataclasses.txt

@@ -0,0 +1,2 @@
+no-member:69:26:TestClass2.some_func:Instance of 'Field' has no 'items' member:INFERENCE
+no-member:81:26:TestClass3.some_func:Instance of 'Field' has no 'items' member:INFERENCE

tests/functional/t/too/too_many_instance_attributes.py

@@ -1,4 +1,6 @@
 # pylint: disable=missing-docstring, too-few-public-methods, useless-object-inheritance
+from dataclasses import dataclass, InitVar
+
 
 class Aaaa(object): # [too-many-instance-attributes]
 
@@ -24,3 +26,20 @@ def __init__(self):
         self._iiii = 9
         self._jjjj = 10
         self.tomuch = None
+
+
+# InitVars should not count as instance attributes (see issue #3754)
+# Default max_instance_attributes is 7
+@dataclass
+class Hello:
+    a_1: int
+    a_2: int
+    a_3: int
+    a_4: int
+    a_5: int
+    a_6: int
+    a_7: int
+    a_8: InitVar[int]
+
+    def __post_init__(self, a_8):
+        self.a_1 += a_8

tests/functional/t/too/too_many_instance_attributes.txt

@@ -1 +1 @@
-too-many-instance-attributes:3:0:Aaaa:Too many instance attributes (21/7)
+too-many-instance-attributes:5:0:Aaaa:Too many instance attributes (21/7):HIGH