[TEST — DO NOT MERGE] try unified phpunit runner with --group filter

Throwaway experiment to find out whether
`--group mediawiki-databaseless` short-circuits PHPUnit's test discovery
*before* the suite-time hazards fire — i.e. whether modern PHPUnit
skips loading test files whose class-level group annotation doesn't
match the filter.

Predictions for each matrix entry, given the failure mode each branch
showed in earlier iterations:

- REL1_39 — under the new runner, Scribunto's
  Scribunto_LuaEngineTestBase::suite() static method blew up at
  discovery time on MediaWikiServices::getParserFactory(). If --group
  filtering short-circuits class load, this entry should now pass.
  Otherwise same failure as before.
- REL1_40, REL1_41, REL1_42 — never reached in the prior big-bang
  attempt (matrix-mate cancellation). Now we'll see.
- REL1_43 — same as above.
- master — Scribunto_LuaEngineTestBase class wasn't autoloadable
  (renamed/namespaced on current Scribunto). Same load-vs-filter
  question.

Only LuaLibrary* tests carry `@group Database`; all other unit tests
carry `@group mediawiki-databaseless` and would be the ones actually
run.

Also pulls in two supporting changes from #77 so master has a chance:
* installWiki.sh: git clone instead of wget tarball (phpunit.xml.template
  ships in git but is export-ignored from the archive)
* MediaWiki cache key bumped to a one-off `-experiment` suffix so the
  experimental install actually runs and doesn't shadow itself onto
  other PRs' caches

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: malberts

.github/workflows/ci.yml

@@ -74,7 +74,7 @@ jobs:
             mediawiki
             !mediawiki/extensions/
             !mediawiki/vendor/
-          key: mw_${{ matrix.mw }}-php${{ matrix.php }}
+          key: mw_${{ matrix.mw }}-php${{ matrix.php }}-experiment
 
       - name: Cache Composer cache
         uses: actions/cache@v4
@@ -103,12 +103,21 @@ jobs:
         run: bash EarlyCopy/.github/workflows/uploadImages.sh
 
       - if: env.TYPE != 'coverage'
-        name: Run PHPUnit w/o coverage
-        run: php tests/phpunit/phpunit.php -c extensions/BootstrapComponents/ --testsuite bootstrap-components-unit
+        name: '[TEST] Run PHPUnit (unified runner, --group mediawiki-databaseless)'
+        run: |
+          (composer phpunit:config 2>/dev/null || true)
+          vendor/bin/phpunit -c extensions/BootstrapComponents/phpunit.xml.dist \
+            --bootstrap tests/phpunit/bootstrap.php \
+            --group mediawiki-databaseless
 
       - if: env.TYPE == 'coverage'
-        name: Run PHPUnit w/ coverage
-        run: php tests/phpunit/phpunit.php -c extensions/BootstrapComponents/ --testsuite bootstrap-components-unit --coverage-clover coverage.clover
+        name: '[TEST] Run PHPUnit (unified runner, --group mediawiki-databaseless, coverage)'
+        run: |
+          (composer phpunit:config 2>/dev/null || true)
+          vendor/bin/phpunit -c extensions/BootstrapComponents/phpunit.xml.dist \
+            --bootstrap tests/phpunit/bootstrap.php \
+            --group mediawiki-databaseless \
+            --coverage-clover coverage.clover
 
       - if: env.TYPE == 'coverage'
         name: upload coverage report

.github/workflows/installWiki.sh

@@ -4,10 +4,9 @@ MW_BRANCH=$1
 EXTENSION_NAME=$2
 
 ## install core
-wget https://github.com/wikimedia/mediawiki/archive/${MW_BRANCH}.tar.gz -nv
-
-tar -zxf $MW_BRANCH.tar.gz
-mv mediawiki-$MW_BRANCH mediawiki
+# [TEST BRANCH] git clone instead of tarball — MW master needs
+# phpunit.xml.template which is export-ignored from the archive.
+git clone --depth 1 --branch "$MW_BRANCH" https://github.com/wikimedia/mediawiki.git mediawiki
 cd $MW_ROOT
 
 composer install