Update Unit Test code to work with PHPUnit8 whilst maintaining suppor…#355

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KarinG merged 2 commits intoiATSPayments:masterfrom seamuslee001:phpunit8

May 22, 2021

+7-170

Commits on Mar 19, 2021

Update Unit Test code to work with PHPUnit8 whilst maintaining support for current phpunit versions
seamuslee001
committed

Commits on May 22, 2021

Also ensure no caching of test results
seamuslee001
committed