#27500 Prepare GroupedImportExport module Tests for PHPUnit 8

[lbajsarowicz]

Description (*)

Preparing PHPUnit Tests to run with PHPUnit 8.
PRs for each module is separated to make tests easier to merge.

Related Pull Requests

Fixed Issues (if relevant)

1. Unit Tests incompatible with PHPUnit 8 #27500

Manual testing scenarios (*)

N/A

Questions or comments

PR #27701 needs to be merged first (otherwise PHPUnit tests fail)

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)

[m2-assistant]

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[magento-engcom-team]

Hi @rogyar, thank you for the review.
ENGCOM-7400 has been created to process this Pull Request
✳️ @rogyar, could you please add one of the following labels to the Pull Request?

Label	Description
Auto-Tests: Covered	All changes in Pull Request is covered by auto-tests
Auto-Tests: Not Covered	Changes in Pull Request requires coverage by auto-tests
Auto-Tests: Not Required	Changes in Pull Request does not require coverage by auto-tests

[m2-assistant]

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