jest - astromechanic/cheat_sheets GitHub Wiki

import { sum } from '../sum';
    
describe('sum()', () => {
  it('should add 1 and 2 returning 3', () => {
    expect(sum(1, 2)).toBe(3);
  });
});

describe(name, callback)

it = test

expect(expression).jestMatcher() - see the jest matches here: https://jestjs.io/docs/expect