ci: add test coverage indicator

.github/workflows/tests.yml

@@ -26,17 +26,28 @@ jobs:
           beam: beam/**
 
   test:
-    name: ${{ matrix.package }}
+    name: ${{ matrix.package }} (test)
     needs: changes
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
         package: ${{ fromJSON(needs.changes.outputs.packages) }}
+        include:
+          - branch: development
+            artifact: development
+          - branch: ${{ github.head_ref }}
+            artifact: pull-request
+
+    permissions:
+      # Required to checkout the code
+      contents: read
 
     steps:
-      - name: Checkout
+      - name: Checkout (${{ matrix.branch }})
         uses: actions/checkout@v4
+        with:
+          ref: ${{ matrix.branch }}
 
       - name: Install Node
         uses: actions/setup-node@v4
@@ -55,10 +66,40 @@ jobs:
         working-directory: ./${{ matrix.package }}
         run: node ../common/scripts/install-run-rushx.js test:coverage
 
-      - name: Coverage Report
-        if: always() # generate the coverage report even if tests are failing
+      - name: Upload Coverage
+        if: always() # upload the coverage report even if tests are failing
+        uses: actions/upload-artifact@v4
+        with:
+          name: coverage-${{ matrix.package }}-${{ matrix.artifact }}
+          path: ./${{ matrix.package }}/coverage
+
+  coverage:
+    name: ${{ matrix.package }} (coverage)
+    needs: [changes, test]
+    runs-on: ubuntu-latest
+    if: always() # run the coverage report even if tests are failing
+
+    strategy:
+      matrix:
+        package: ${{ fromJSON(needs.changes.outputs.packages) }}
+
+    steps:
+      - name: Download PR Branch Coverage
+        uses: actions/download-artifact@v4
+        with:
+          name: coverage-${{ matrix.package }}-pull-request
+          path: coverage
+
+      - name: Download Base Branch Coverage
+        uses: actions/download-artifact@v4
+        with:
+          name: coverage-${{ matrix.package }}-development
+          path: coverage-${{ matrix.package }}-development
+
+      - name: Report Coverage
         uses: davelosert/vitest-coverage-report-action@v2
         with:
           working-directory: ./${{ matrix.package }}
           file-coverage-mode: 'all'
           vite-config-path: './vite.config.ts'
+          json-summary-compare-path: coverage-${{ matrix.package }}-development/coverage-summary.json