const {overArgs} = require('./_30s.js');

test('overArgs is a Function', () => {
  expect(overArgs).toBeInstanceOf(Function);
});
const square = n => n * n;
const double = n => n * 2;
const fn = overArgs((x, y) => [x, y], [square, double]);
test('Invokes the provided function with its arguments transformed', () => {
  expect(fn(9, 3)).toEqual([81, 6]);
});