This new test class tests that the plugin does not act on Composer packages which are not considered valid external PHPCS standards for the purposes of this plugin.
Notes:
This test is about Composer and the plugin, so does not need to be tested against multiple PHPCS versions.
The behaviour also shouldn't differ between a global vs local Composer install, so only testing one type.
Proposed Changes
This new test class tests that the plugin does not act on Composer packages which are not considered valid external PHPCS standards for the purposes of this plugin.
Notes:
Related to #92