test: fix test_bad_config failure due to Click 8.2.0 breaking change

Fix test failure in test_bad_config caused by Click 8.2.0+ behavior
change. Click 8.2.0+ now keeps stdout and stderr streams separate by
default.

Maintains backward compatibility with existing test assertions.

Fixes #1308

Author: dogukancagatay

tests/test_cli.py

@@ -19,7 +19,11 @@ def test_bad_config() -> None:
     result = runner.invoke(app, ["generate", f"--config={config_path}", f"--path={path}"])
 
     assert result.exit_code == 2
-    assert "Unable to parse config" in result.stdout
+    error_message = "Unable to parse config"
+    assert (
+        error_message in result.stderr
+        or error_message in result.stdout
+    ), f"Error message '{error_message}' not found in any output. stdout: {repr(result.stdout)}, stderr: {repr(result.stderr)}, output: {repr(result.output)}"
 
 
 class TestGenerate: