Test failure in test_bad_config due to Click 8.2.0 breaking change #1308
Description
Describe the bug
The test_bad_config function in tests/test_cli.py fails due to a breaking change in Click 8.2.0 that affects how CliRunner handles stdout and stderr streams.
According to the Click 8.2.0 changelog, Click made a breaking change to CliRunner behavior:
Keep stdout and stderr streams independent in CliRunner. Always collect stderr output and never raise an exception. Add a new output stream to simulate what the user sees in its terminal. Removes the mix_stderr parameter in CliRunner.
Before Click 8.2.0: The CliRunner mixed stdout and stderr streams by default, making error messages accessible via result.stdout.
After Click 8.2.0: The CliRunner keeps stdout and stderr streams completely separate. Error messages from Typer (like "Unable to parse config") now go exclusively to result.stderr, while result.stdout remains empty.
OpenAPI Spec File
N/A
Desktop (please complete the following information):
- OS: macOS 15.6.1, Fedora 43
- Python Version: 3.13.7, 3.14.0rc2
- openapi-python-client version 0.26.0
Additional context
No additional context.