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When trying to fix a Slim-Psr7 compatibility issue with PHP 7.4, I ran into a bunch of failing tests due to PHPUnit 7.x not being fully compatible with PHP 7.4. These issues were fixed in PHPUnit 8, but Slim-Psr7 can't be tested with PHPUnit 8 unless this library (which Slim-Psr7 depends on) also supports PHPUnit 8.
Unfortunately it doesn't appear possible to support both PHPUnit 8 and PHPUnit 7/6/5 at the same time when implementing methods like
setUp
that have a void return type. So it may be best to either merge this PR into a branch other than master, or else tag a release, so libraries that don't support PHPUnit 8 can use it as their dependency version instead of dev-master.