Revert "no build needed to run unit tests"

This reverts commit 9360e59.

Author: Bart Veneman

.github/workflows/test.yml

@@ -58,4 +58,5 @@ jobs:
         with:
           cache: npm
       - run: npm install --no-fund --no-audit --ignore-scripts
+      - run: npm run build
       - run: npm test