Patch phpunit to allow testing in PHP 8.1 #131
Merged
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Resolves #130.
PHP 8.1 introduced strict requirement to match function header when implementing an interface, unfortunately this makes a breaking change for older versions of PHP without any meaningful benefit. Fortunately these requirements can be suppressed, which was done in this PR.
This PR adds PHP 8.1 to CI pipeline, downgrades to older phpunit to support PHP 5.4 and patches phpunit to support PHP 8.1.