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

test('reducedFilter is a Function', () => {
  expect(reducedFilter).toBeInstanceOf(Function);
});
const data = [
  {
    id: 1,
    name: 'john',
    age: 24
  },
  {
    id: 2,
    name: 'mike',
    age: 50
  }
];
test('Filter an array of objects based on a condition while also filtering out unspecified keys.', () => {
  expect(reducedFilter(data, ['id', 'name'], item => item.age > 24)).toEqual([
    { id: 2, name: 'mike' }
  ]);
});