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

test('remove is a Function', () => {
  expect(remove).toBeInstanceOf(Function);
});
test('Removes elements from an array for which the given function returns false', () => {
  expect(remove([1, 2, 3, 4], n => n % 2 === 0)).toEqual([2, 4]);
});