URGENT: Update all unit tests to use PHPUnit 9

[Rotimi Adegbamigbe]

The package currently uses PHPUnit 4 which targets PHP 5.3-5.6 and has not been updated since 2017.

PHPUnit 9 is the current version and it supports PHP7.3+.

https://phpunit.de/supported-versions.html

The current unit tests targeted towards PHPUnit 4 are not running reliably on PHP 7.4 which is the minimum supported version of PHP at the moment.

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There is no way to reliably add new features & tests to this package and run the whole test suite to ensure new changes aren’t breaking existing features.

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This issue needs to be resolved ASAP and all tests need to run and pass using PHPUnit 9 before any further enhancements are made to this package.

[Jon Elofson]

Done, but I had issues with some of the Ldap tests so I removed them for now. They are all mocks anyway and don’t really test anything.

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