IBX-12606: Replaced the Symfony deprecation thresholds with PHPUnit's native deprecation gate

[ViniTou]

🎫 Issue	IBX-12606

Description:

CI status: MySQL/PostgreSQL integration (8.4) red on GetContentTreeChildrenTest / PostPostLoadSubtreeTest: REST snapshot expects <isBookmarked>true</isBookmarked>, actual false. Behaviour change from ibexa/core IBX-6773 (#476, "Fixed loading Bookmarks for non-accessible content items", merged to core 6.0 on 2026-09-17), which CI now resolves. Unrelated to this PR; admin-ui's fixture/snapshot needs a follow-up under its own ticket.

SYMFONY_DEPRECATIONS_HELPER (max[...] thresholds) is dead under PHPUnit 11: phpunit-bridge's bootstrap.php returns early and SymfonyExtension registers no DeprecationErrorHandler, so the old threshold was silently doing nothing. This PR replaces it with PHPUnit 11's native deprecation gate: failOnDeprecation="true" + displayDetailsOnTestsThatTriggerDeprecations="true" on the root <phpunit> element, plus a <source baseline="..."> block (ignoreIndirectDeprecations="false", ignoreSuppressionOfDeprecations="true", <include><directory>src</directory></include>, covering src/lib, src/bundle, src/contracts, src/internal-contracts per the psr-4 autoload) so any new deprecation fails the suite while existing ones are baselined. ignoreIndirectDeprecations is false (not true): PHPUnit classifies a Symfony deprecation triggered from our code as "indirect" (the immediate caller is deprecation-contracts/function.php), so true would silently drop deprecated-vendor-API usages from our own code — false catches those too, while the baseline still limits the gate to genuinely new deprecations.

Per config:

• phpunit.xml (unit/bundle suites) — gated. Baseline regenerated on PHP 8.4 (CI's highest matrix version): phpunit.baseline.xml, 15 issues (704 tests, exit 0, "15 issues were ignored by baseline") — all 15 are external (vendor-originated ctype_digit() deprecations); 0 internal (Since ibexa/...) messages. The 8.4 regeneration produced byte-identical output to the prior 8.3 baseline (no PHP-8.4-only deprecations were triggered by this repo's suite). Verified passing under both PHP 8.4 and PHP 8.3, each printing "15 issues were ignored by baseline" (exit 0 on both). Probe verified: injecting trigger_deprecation() into RoleTransformer::transform() made the suite fail (exit 1); removed afterwards (git diff -- src empty), suite passes again (exit 0).
• phpunit.integration.xml — gate not enabled: only the dead SYMFONY_DEPRECATIONS_HELPER env line was removed. The suite cannot currently boot to completion in this environment (Symfony test container build fails, and further along the JMS translation extractor requires a Node.js runtime with @typescript-eslint/typescript-estree that isn't available locally), so no baseline could be generated. Left ungated for now; enabling it is future work once it can run to completion (e.g. in CI).

To refresh the baseline: with a real (non-symlinked) vendor/ and PHPUnit 11 installed, run vendor/bin/phpunit -c phpunit.xml --generate-baseline phpunit.baseline.xml.

Merge note: this branch is stacked on the still-open phpunit-11 PR (this PR targets phpunit-11, not main) — the phpunit-11 PR must merge first.

• Baselines are generated on PHP 8.4 (CI's highest matrix version); PHP-native deprecations from vendor code (e.g. league/flysystem implicit-nullable parameters) only fire there. Regenerate with the highest PHP version in the matrix.

Two follow-up commits on top of the above:

• Restored failOnWarning="true" / failOnNotice="true" on the root <phpunit> element of both phpunit.xml and phpunit.integration.xml. PHPUnit 9's convertErrorsToExceptions/convertNoticesToExceptions/convertWarningsToExceptions were removed by the wave PR without their PHPUnit 10+ replacements, so notices and warnings were silently no longer failing the suite. phpunit.integration.xml already had failOnWarning; only failOnNotice was missing there.
• Dropped the unused symfony/phpunit-bridge dependency: require-dev in composer.json and the <bootstrap class="Symfony\Bridge\PhpUnit\SymfonyExtension"/> line from both configs (the DAMA\DoctrineTestBundle extension in phpunit.integration.xml is untouched). The repo has zero usage of ClockMock, DnsMock, ExpectDeprecationTrait, expectDeprecation(), or SYMFONY_DEPRECATIONS_HELPER — the extension only wired those, and its deprecation handler is already inert under PHPUnit 11. composer why symfony/phpunit-bridge confirms nothing else in the tree requires it.

For QA:

N/A

Documentation:

N/A

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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