Hi Florian,

I find this plugin very useful, in fact I think it would make sense for this to be in pytest-core given that `--lf` already exists.

What if the --lf option can optionally accept a file name, which when given, will read the set of failed tests from that file instead of reading it from the cache. This way you can just save the `.pytest_cache/lastfailed` file from CI, and reuse it locally:

pytest --lf=lastfailed-file-from-ci

Seems like the changes would be minimal for that to happen.

I know this is not exactly the feedback you wanted, but thought I would throw the idea in there for your consideration.

Cheers,

Bruno

On Mon, Jul 15, 2024, at 2:29 AM, Florian Schulze wrote:

Hi!

I wrote https://github.com/fschulze/pytest-failed and would like to get some feedback on a few things before I publish it.

What is it?

The plugin adds ``--dump-lf`` and ``--restore-lf`` options.

My use case is two fold for test suites with runtimes of several minutes:

1. when tests fail in CI, I can copy the summary from the report and paste it into a file like ``failed.txt`` then re-run just those tests with ``--restore-lf=failed.txt``

2. when fixing a bug I often fix only some of tests at the first attempt, then refactor the fix and want to re-run all initially failing tests. With this plugin I only run the full test suite once, then run with ``--dump-lf=failed.txt`` and can restore the initial bunch of tests with ``--restore-lf=failed.txt`` whenever I like, without ever re-running the full test suite.

This is also super useful with ``git bisect`` and likely many other use-cases.

The ``=`` in the options seems to be required, as otherwise the filename might be interpreted as ``[file_or_dir]`` by pytest in some forms of invokation.

My questions:

In [``pytest_cmdline_main``](https://github.com/fschulze/pytest-failed/blob/main/src/pytest_failed/plugin.py#L44) I use ``config._do_configure``, which is internal API. Is there a better way?

Anyone have suggestions for better names of the plugin itself and its options? I think ``--dump-lf`` is ok, but I don't really like ``--restore-lf``.

When reading the list of test names it knows about the pytest report summary syntax, are there any other formats that would be useful to support for cut'n'paste from CI?

If you try the plugin, please give feedback on whether you found it useful and understand how it works.

Regards,
Florian Schulze
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