JEST: Add tests for multiplier calculation - #3093

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, tj-actions/changed-files@c65cd883420fd2eb864698a825fc4162dd94482c. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/