mathjs/test/node-tests/commonjs.test.js

// Only use native node.js API's and references to ./lib here, this file is not transpiled!
const assert = require('assert')
const cp = require('child_process')
const path = require('path')

describe('lib/cjs', function () {
  it('should load via commonjs', function (done) {
    const filename = path.join(__dirname, 'commonjsApp.cjs')
    cp.exec('node ' + filename, function (error, result) {
      assert.strictEqual(error, null)
      assert.strictEqual(result, '2\n2i\n')
      done()
    })
  })
  it('should load numbers only via commonjs', function (done) {
    const filename = path.join(__dirname, 'commonjsAppNumberOnly.cjs')
    cp.exec('node ' + filename, function (error, result) {
      assert.strictEqual(error, null)
      assert.strictEqual(result, '2\nNaN\n')
      done()
    })
  })
})