Major fixes and new features

venv/lib/python3.12/site-packages/mypy/test/testutil.py

@@ -0,0 +1,17 @@
+from __future__ import annotations
+
+import os
+from unittest import TestCase, mock
+
+from mypy.util import get_terminal_width
+
+
+class TestGetTerminalSize(TestCase):
+    def test_get_terminal_size_in_pty_defaults_to_80(self) -> None:
+        # when run using a pty, `os.get_terminal_size()` returns `0, 0`
+        ret = os.terminal_size((0, 0))
+        mock_environ = os.environ.copy()
+        mock_environ.pop("COLUMNS", None)
+        with mock.patch.object(os, "get_terminal_size", return_value=ret):
+            with mock.patch.dict(os.environ, values=mock_environ, clear=True):
+                assert get_terminal_width() == 80