Create javascript-tests.yml

.github/workflows/javascript-tests.yml

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+# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-nodejs
+
+name: JavaScript tests (Jest)
+# This CI workflow uses Jest, which runs in a Node.js environment, to test the JavaScript code.
+# Jest allows JavaScript modules to be loaded and tested in isolation.
+# By contrast, the Playwright CI workflow uses Playwright, which loads the entire app in the browser and simulates user interactions.
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x]
+        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'yarn' 
+        # https://github.com/actions/setup-node?tab=readme-ov-file#caching-global-packages-data
+    - run: yarn install --immutable
+      # https://yarnpkg.com/cli/install#options
+    - run: yarn test