basic_testing_library.js

const assert = (description, test) => {
  if(test()) { console.log(`✔ ${description}`); } 
  else { console.error(`✖ ${description}`); }
};

const describe = (description, tests) => {
  console.log('----------------------------');
  console.log(`%c${description}`, `font-weight:800;`);
  tests();
};

describe('Testing the testing framework', () => {
  assert('I must pass', () => true);
  assert('I should fail', () => false);
});