Fix #1555: Fix false negative for `no-member` when assigning instance attribute to itself (#5544)

Co-authored-by: Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>

2 files changed, 38 insertions, 0 deletions

diff --git a/tests/functional/n/no/no_member_assign_same_line.py b/tests/functional/n/no/no_member_assign_same_line.py
new file mode 100644
index 000000000..45138d933
--- /dev/null
+++ b/tests/functional/n/no/no_member_assign_same_line.py
@@ -0,0 +1,37 @@
+"""Tests for no-member for self-referencing instance attributes
+See https://github.com/PyCQA/pylint/issues/1555
+"""
+# pylint: disable=too-few-public-methods
+
+
+class ClassWithMember:
+    """Member defined in superclass."""
+    def __init__(self):
+        self.member = True
+
+
+class AssignMemberInSameLine:
+    """This class attempts to assign and access a member in the same line."""
+    def __init__(self):
+        self.member = self.member  # [no-member]
+
+
+class AssignMemberInSameLineAfterTypeAnnotation:
+    """This might emit a message like `maybe-no-member` in the future."""
+    def __init__(self):
+        self.member: bool
+        self.member = self.member
+
+
+class AssignMemberFromSuper1(ClassWithMember):
+    """This assignment is valid due to inheritance."""
+    def __init__(self):
+        self.member = self.member
+        super().__init__()
+
+
+class AssignMemberFromSuper2(ClassWithMember):
+    """This assignment is valid due to inheritance."""
+    def __init__(self):
+        super().__init__()
+        self.member = self.member
diff --git a/tests/functional/n/no/no_member_assign_same_line.txt b/tests/functional/n/no/no_member_assign_same_line.txt
new file mode 100644
index 000000000..a6b15b9cd
--- /dev/null
+++ b/tests/functional/n/no/no_member_assign_same_line.txt
@@ -0,0 +1 @@
+no-member:16:22:16:33:AssignMemberInSameLine.__init__:Instance of 'AssignMemberInSameLine' has no 'member' member:INFERENCE