Minimal Node.js test runner

math.test.js

import assert from 'node:assert/strict';

export default {
  'tests for sum': {
    '1 + 1 should be 2'() {
      assert.equal(1 + 1, 2);
    },
    '2 + 2 should be 4'() {
      assert.equal(2 + 2, 4);
    },
  },

  'tests for multiplication': {
    '1 * 1 should be 1'() {
      assert.equal(1 * 1, 1);
    },
    '2 * 2 should be 4'() {
      assert.equal(2 * 2, 4);
    },
  },
};

test.js

import fs from 'node:fs';

const [pattern] = process.argv.slice(2);

fs.glob(pattern, async (error, filenames) => {
  if (error) throw error;

  for (const filename of filenames) {
    const suite = await import(`${process.cwd()}/${filename}`);
    for (const [description, tests] of Object.entries(suite.default || suite)) {
      console.log('');
      console.log(description);
      for (const [title, test] of Object.entries(tests)) {
        try {
          test();
          console.log(`✅ ${title}`);
        } catch (error) {
          console.error(`❌ ${title}`);
          console.error(error.message);
        }
      }
    }
    console.log('');
  }
});

A minimal test runner for Node.js with support for test groups.
Copy the script and run with node test.js to get the test results: