Reinstate CI unit test coverage (#2274)

* Unit test coverage

* rename upload step

* use my favorite test reporters

text reporter provides output in ci log
html-spa reporter provides friendly and interactive output

* upload coverage even if unit tests fail

.github/workflows/test-all.yml

@@ -59,7 +59,13 @@ jobs:
         run:
           nohup Xvfb &
           echo "DISPLAY=:0" >> $GITHUB_ENV
-      - run: npm run jest-ci -- --selectProjects unit
+      - run: npm run jest-ci -- --coverage --coverageReporters text html-spa --selectProjects unit
+      - name: Upload unit test coverage
+        if: success() || failure()
+        uses: actions/upload-artifact@v3
+        with:
+          name: unit-test-coverage
+          path: ${{ github.workspace }}/coverage
       - run: npm run build-dev
         if: success() || failure()
       - run: npm run test-render
@@ -83,4 +89,4 @@ jobs:
       - run: npm ci
       - run: npm run build-dist
       - run: npm run jest-ci -- --selectProjects build
-        if: success() || failure()
+        if: success() || failure()