CODE EXAMPLE FOR JAVASCRIPT

testing jest

const cal = require('../index');

test('adds 1 + 2 to equal 3', () => {
  expect(cal.sum(1, 2)).toBe(3);
  expect(cal.sum(1, 2)).not.toBe(4);
  expect(cal.sum(1, 2)).toBeGreaterThan(2);
  expect(cal.sum(1, 2)).toBeLessThan(4);
  expect(cal.sum(1, 2)).toBeCloseTo(3);
  // Testing datatype
  expect(typeof cal.sum(1, 2)).toBe("number");
});