GitHub Action: Add mocha Maths/test/Abs.test.js

Author: cclauss

.github/workflows/nodejs.yml

@@ -14,12 +14,13 @@ jobs:
         node-version: ${{ matrix.node-version }}
     - name: npm install, build, and test
       run: |
-        npm install doctest standard --save-dev
+        npm install doctest mocha standard --save-dev
         npx doctest Sorts/BogoSort.js Sorts/BucketSort.js
         npx standard
         cd Linear-Algebra
         npm ci
         npm run build --if-present
         npm test
+        mocha Maths/test/Abs.test.js
       env:
         CI: true