Retrieve plugin file to load from environment

[pierlon]

This allows a custom plugin file to be specified. Solves edge cases where the incorrect plugin file is loaded when multiple plugin files are present.

[derekherman]

Thank you @pierlon, what was the reason for the force push? Can you describe how this would be used in the wild. Why would a plugin have two plugin files? That would be an issue with Core as well.

[pierlon]

what was the reason for the force push

I missed a line:

wp-dev-lib/sample-config/phpunit-plugin-bootstrap.php

Line 25 in e1f26ee

global $_plugin_file;

Should I instead make a new commit with the fix and squash on merge?

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Why would a plugin have plugin files

In our case, we would like to add a plugin to WP AMP for the ability to opt-in to beta updates, and putting it alongside the main plugin file would be the most logical option (see ampproject/amp-wp#3560). Having more than one plugin file in the same folder no longer guarantees that the correct plugin file will be loaded.

[kasparsd]

@pierlon Could you please check if this suggestion would work for your setup -- to extend the list of plugins loaded via WP_TEST_ACTIVATED_PLUGINS instead.

[kasparsd]

Looks good to me!

[pierlon]

Much thanks @kasparsd 👍 .