Testing with wallaby.js and Jest

Install Jest

npm install

Configure wallaby.js

Create wallaby.js configuration file.

module.exports = function () {

  return {
    files: ['sum.js'],

    tests: ['__tests__/*.js'],

    env: {
      type: 'node',
      runner: 'node'
    },

    testFramework: 'jest'
  };
};

Please note that wallaby.js is using its own cache to run your tests from, not the local project folder, so you need to include all files (except node modules) that your tests need, for example __mocks__/*.*, etc.