Add tests for ClassDef inference regression (#5037)

Closes #5030
Closes #5036

3 files changed, 38 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index addf49578..00eb650ec 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -75,6 +75,11 @@ Release date: TBA
 * Add ``is_sys_guard`` and ``is_typing_guard`` helper functions from astroid
   to ``pylint.checkers.utils``.
 
+* Fix regression on ClassDef inference
+
+  Closes #5030
+  Closes #5036
+
 
 What's New in Pylint 2.11.1?
 ============================
diff --git a/tests/functional/r/regression/regression_5030.py b/tests/functional/r/regression/regression_5030.py
new file mode 100644
index 000000000..8aa22f879
--- /dev/null
+++ b/tests/functional/r/regression/regression_5030.py
@@ -0,0 +1,31 @@
+"""Regression in astroid on ClassDef inference with two test cases.
+Fixed in https://github.com/PyCQA/astroid/pull/1181"""
+
+from typing import Tuple, Type
+from typing import Dict, List, Any
+from dataclasses import dataclass, field
+
+# https://github.com/PyCQA/pylint/issues/5030
+def is_type_list(f_type: Type) -> bool:
+    """just here to show the issue"""
+    return f_type == list
+
+assert not is_type_list(Tuple)
+
+
+# https://github.com/PyCQA/pylint/issues/5036
+@dataclass
+class SomeData:
+    """A dataclass."""
+    a_dict: Dict[str, List[str]] = field(default_factory=dict)
+
+
+@dataclass
+class SubSomeData(SomeData):
+    """A subclass of a dataclass."""
+
+    def __init__(self, **kwargs: Dict[str, Any]) -> None:
+        """Subclass init func."""
+        super().__init__(**kwargs)
+        if "test" in self.a_dict:
+            print(self.a_dict["test"])
diff --git a/tests/functional/r/regression/regression_5030.rc b/tests/functional/r/regression/regression_5030.rc
new file mode 100644
index 000000000..a17bb22da
--- /dev/null
+++ b/tests/functional/r/regression/regression_5030.rc
@@ -0,0 +1,2 @@
+[testoptions]
+min_pyver=3.7