[Issue] Fix unit tests with PHPUnit 9 errors

[m2-assistant]

This issue is automatically created based on existing pull request: #29244: Fix unit tests with PHPUnit 9 errors

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Description (*)

Most of the failing tests are due to:

• Depending on setUp logic in dataProviders, while dataProvider code is called before setUp
• Trying to mock non-existing methods with createPartialMock which is prohibited in PHPUnit 9

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes magento/magento2#<issue_number>

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[slavvka]

Hi @m2-assistant[bot]. Thank you for your report.
The issue has been fixed in #29244 by @AntonEvers in 2.4-develop branch
Related commit(s):

• 86000cea24a9dd757e1b4d6cf54957e32e577f3c
• 48f5a92a29fbb55d1e687bc1c0ff72075147cf82

The fix will be available with the upcoming 2.4.1 release.