Add test step to TypeScript CI workflow

- Added test job that runs before build
- Tests are conditionally executed only for packages that have test scripts
- Filesystem tests will now run automatically in CI on every push and PR
- Build job now depends on successful test completion

.github/workflows/typescript.yml

@@ -22,8 +22,43 @@ jobs:
           PACKAGES=$(find . -name package.json -not -path "*/node_modules/*" -exec dirname {} \; | sed 's/^\.\///' | jq -R -s -c 'split("\n")[:-1]')
           echo "packages=$PACKAGES" >> $GITHUB_OUTPUT
 
-  build:
+  test:
     needs: [detect-packages]
+    strategy:
+      matrix:
+        package: ${{ fromJson(needs.detect-packages.outputs.packages) }}
+    name: Test ${{ matrix.package }}
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        working-directory: src/${{ matrix.package }}
+        run: npm ci
+
+      - name: Check if tests exist
+        id: check-tests
+        working-directory: src/${{ matrix.package }}
+        run: |
+          if npm run test --silent 2>/dev/null; then
+            echo "has-tests=true" >> $GITHUB_OUTPUT
+          else
+            echo "has-tests=false" >> $GITHUB_OUTPUT
+          fi
+        continue-on-error: true
+
+      - name: Run tests
+        if: steps.check-tests.outputs.has-tests == 'true'
+        working-directory: src/${{ matrix.package }}
+        run: npm test
+
+  build:
+    needs: [detect-packages, test]
     strategy:
       matrix:
         package: ${{ fromJson(needs.detect-packages.outputs.packages) }}