Test to ensure readline is not imported (#2375)

See #2232

tests/unit-tests/test_readline.py

@@ -0,0 +1,21 @@
+from __future__ import annotations
+
+import sys
+
+import mocks.gdb  # noqa: F401
+import mocks.gdblib  # noqa: F401
+
+import pwndbg  # noqa: F401
+
+
+def test_readline_not_imported():
+    """
+    Importing CPython readline breaks GDB's use of GNU readline.
+    This breaks GDB tab autocomplete.
+
+    It's easy to accidentally import something that imports readline far down
+    the dependency chain. This test ensures we don't ever do that.
+
+    For more info see https://github.com/pwndbg/pwndbg/issues/2232
+    """
+    assert "readline" not in sys.modules