[TASK] Update functional tests examples

[brotkrueml]

• Remove superfluous "Test Case" comment
• Add declare(strict_types=1); as best practise
• Use @test annotation as best practise like the Core does
• Add void return type as best practise
• Add typo3/testing-framework as requirement to have code completion in the PHP files

Note: As this is set to be merged also to 12.4, the @test annotation is used (instead of the #[Test] annotation) to be compatible with testing framework v7 and v8 (v7 is compatible with phpunit 9/10 and TYPO3 v11/v12, v8 is compatible with phpunit 10/11 and TYPO3 v12/v13). In a follow-up only to main (v13) this will be changed to the annotation.

Releases: main, 12.4

[froemken]

Thank you. Much better than the earlier "testMethod" solution.

[linawolf]

Thank you, looks food

[github-actions]

The backport to 12.4 failed:

The process '/usr/bin/git' failed with exit code 1

stderr

error: could not apply 530bcc2d8... [TASK] Update functional tests examples
hint: After resolving the conflicts, mark them with
hint: "git add/rm <pathspec>", then run
hint: "git cherry-pick --continue".
hint: You can instead skip this commit with "git cherry-pick --skip".
hint: To abort and get back to the state before "git cherry-pick",
hint: run "git cherry-pick --abort".
hint: Disable this message with "git config advice.mergeConflict false"

stdout

Auto-merging composer.json
CONFLICT (content): Merge conflict in composer.json

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-12.4 12.4
# Navigate to the new working tree
cd .worktrees/backport-12.4
# Create a new branch
git switch --create backport-4784-to-12.4
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 530bcc2d84cf92ec6a382b5d865c75d44ebfa518,8dbe4bbf895c63e3117d869cf08c58e2fd90ac97,494bcb207f623e91f0c4e6117dc6d30b84aa02e3
# Push it to GitHub
git push --set-upstream origin backport-4784-to-12.4
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-12.4

Then, create a pull request where the base branch is 12.4 and the compare/head branch is backport-4784-to-12.4.

[brotkrueml]

Will take care of the backport.