Hi,
I'm using Ruff on a codebase with a good amount of assert statements - it's non-production code, and they're a good way to find bugs as you're testing things.

However, the way that Black and Ruff format assert statements once they pass a certain length doesn't make sense, as the active issues on Black show:

• Open issues on Black repo containing 'assert'
• example 1 example 2 example 3

This seems to be a common issue with black that hasn't been addressed for some time, and the reason I started using Ruff is because I was hoping this behavior was something I could disable.

Example

Input:

    assert Path(filepath).exists(), f'longish assert string with filepath {filepath} not found!'

Formatted output:

    assert Path(
        filepath
    ).exists(), f'longish assert string with filepath {filepath} not found!'

Which is objectively less readable.

Desired behavior:
An option to either:

• Disable formatting of assert statements entirely
• Disable splitting parenthesis for specified keywords (assert, in this case)
• Option to format assert statements like this, and split the error string instead of the conditional.

assert Path(filepath).exists(), \
    f'longish assert string with filepath {filepath} not found!'

Ruff Playground output and IR

Pasting the input into the Ruff Playground and checking out the IR gives this output:

Other

• Ruff version: 0.6.5. Behavior is same using --preview and --isolated flags.