Hey there, nice work on this plugin! Many tooling things to learn while browsing the code :)

The readme states this:

You could use arbitrary path or URL to check a plugin. For example, to check a plugin from a URL: wp plugin check https://example.com/plugin.zip or to check a plugin from a path: wp plugin check /path/to/plugin

I have created composer script in my plugin that creates a test dist-archive:

{
  "test:dist-archive": [
    "wp package install wp-cli/dist-archive-command",
    "config/scripts/generate-distignore.sh",
    "wp dist-archive . $(basename \"$(pwd)\").zip"
  ]
}

I run it like this:

composer test:dist-archive

That successfully creates a nice plugin.zip above my plugin in the /plugins folder. Now, according to the above cite from the readme, shouldn't I be able to do this?

wp plugin check ../plugin.zip

That fails with the error:

Error: Invalid plugin basename: Plugin with basename ../plugin.zip is not installed.

It indeed isn't installed. But I would love to be able to check it without needing to install it – otherwise this will be a painful manual process...