Try: Build WP once for PHPUnit test suite.

.github/workflows/phpunit-tests.yml

@@ -146,6 +146,7 @@ jobs:
       report: ${{ matrix.report || false }}
       gutenberg-artifact: gutenberg-build
       gutenberg-sha: ${{ needs.prepare-gutenberg.outputs.gutenberg-sha }}
+      wordpress-build-artifact: wordpress-build
 
   #
   # Creates a PHPUnit test job for each PHP/MariaDB combination.
@@ -202,6 +203,7 @@ jobs:
       report: false
       gutenberg-artifact: gutenberg-build
       gutenberg-sha: ${{ needs.prepare-gutenberg.outputs.gutenberg-sha }}
+      wordpress-build-artifact: wordpress-build
 
   #
   # Creates PHPUnit test jobs to test MariaDB and MySQL innovation releases.
@@ -252,6 +254,7 @@ jobs:
       report: false
       gutenberg-artifact: gutenberg-build
       gutenberg-sha: ${{ needs.prepare-gutenberg.outputs.gutenberg-sha }}
+      wordpress-build-artifact: wordpress-build
 
   #
   # Runs the HTML API test group.
@@ -287,6 +290,7 @@ jobs:
       phpunit-test-groups: ${{ matrix.phpunit-test-groups }}
       gutenberg-artifact: gutenberg-build
       gutenberg-sha: ${{ needs.prepare-gutenberg.outputs.gutenberg-sha }}
+      wordpress-build-artifact: wordpress-build
 
   #
   # Runs unit tests for forks.
@@ -352,6 +356,7 @@ jobs:
       phpunit-test-groups: ${{ matrix.phpunit-test-groups || '' }}
       gutenberg-artifact: gutenberg-build
       gutenberg-sha: ${{ needs.prepare-gutenberg.outputs.gutenberg-sha }}
+      wordpress-build-artifact: wordpress-build
 
   slack-notifications:
     name: Slack Notifications

.github/workflows/reusable-phpunit-tests-v3.yml

@@ -82,6 +82,11 @@ on:
         required: false
         type: string
         default: ''
+      wordpress-build-artifact:
+        description: 'The name of a same-workflow artifact containing the pre-built WordPress assets. Optional: callers that omit it build per job.'
+        required: false
+        type: string
+        default: ''
     secrets:
       CODECOV_TOKEN:
         description: 'The Codecov token required for uploading reports.'
@@ -186,7 +191,23 @@ jobs:
       - name: Install npm dependencies
         run: npm ci
 
+      - name: Download WordPress build
+        id: download-wordpress
+        continue-on-error: ${{ github.run_attempt != '1' }}
+        if: inputs.wordpress-build-artifact != ''
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+        with:
+          name: ${{ inputs.wordpress-build-artifact }}
+          path: /tmp/wordpress-build
+          digest-mismatch: error
+
+      - name: Apply WordPress build
+        if: steps.download-wordpress.outcome == 'success'
+        run: |
+          tar -xzf /tmp/wordpress-build/wordpress-build.tar.gz
+
       - name: Build WordPress
+        if: inputs.wordpress-build-artifact == '' || steps.download-wordpress.outcome != 'success'
         run: npm run build:dev
         env:
           # The producer resolved this once. Matrix jobs must not re-resolve mutable GHCR tags.

.github/workflows/reusable-prepare-gutenberg.yml

@@ -38,6 +38,7 @@ jobs:
         uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
         with:
           node-version-file: '.nvmrc'
+          cache: npm
 
       - name: Download and verify Gutenberg build
         id: download
@@ -58,3 +59,29 @@ jobs:
           if-no-files-found: error
           include-hidden-files: true
           retention-days: 1
+
+      - name: Install npm dependencies
+        run: npm ci
+        env:
+          PUPPETEER_SKIP_DOWNLOAD: true
+
+      - name: Build WordPress
+        run: npm run build:dev
+        env:
+          GUTENBERG_EXPECTED_SHA: ${{ steps.download.outputs.gutenberg-sha }}
+
+      - name: Package WordPress build
+        run: |
+          { git diff --name-only HEAD; git ls-files --others --exclude="/gutenberg/*" --exclude="/vendor/*" --exclude="/node_modules/*"; } \
+            > /tmp/build-manifest.txt
+          echo "Files included in build artifact:"
+          cat /tmp/build-manifest.txt
+          tar -czf wordpress-build.tar.gz --files-from=/tmp/build-manifest.txt
+
+      - name: Upload WordPress build
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        with:
+          name: wordpress-build
+          path: wordpress-build.tar.gz
+          if-no-files-found: error
+          retention-days: 1

.github/workflows/test-coverage.yml

@@ -78,6 +78,7 @@ jobs:
       coverage-report: ${{ matrix.coverage-report }}
       gutenberg-artifact: gutenberg-build
       gutenberg-sha: ${{ needs.prepare-gutenberg.outputs.gutenberg-sha }}
+      wordpress-build-artifact: wordpress-build
     secrets:
       CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}