John Blackbourn cc13009e99 Build/Test Tools: PHPUnit test improvements:
* Switch back to running the PHPUnit test suite against the `src` directory instead of `build`
* Increase the reliability of backing up the `mu-plugins` directory during tests
* Split the PHPUnit tests for PHP versions below 7.0 in half, allowing them to run in parallel and reduce the overall test run duration on GitHub Actions

Merges [50441-50444] to the 5.7 branch.

Fixes #51734, #51735, #52645


git-svn-id: https://develop.svn.wordpress.org/branches/5.7@50464 602fd350-edb4-49c9-b593-d223f7449a82
2021-03-01 20:21:23 +00:00
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