text: const expect = require('expect');
  const compose = require('./compose.js');
  
  test('compose is a Function', () => {
    expect(compose).toBeInstanceOf(Function);
  });
  const add5 = x => x + 5;
  const multiply = (x, y) => x * y;
  const multiplyAndAdd5 = compose(
    add5,
    multiply
  );
  test('Performs right-to-left function composition', () => {
    expect(multiplyAndAdd5(5, 2)).toBe(15);
  });
  