@future-widget-lab/record-set/src/libs/record-set/helpers/pick/pick.helper.spec.ts

A dedicated data structure for in-memory record collections, offering fluent, immutable APIs for MongoDB-like querying, sorting, and transformation.

import { pick } from './pick.helper';

type Person = {
  id: number;
  name: string;
  age: number;
};

const records: Array<Person> = [
  { id: 1, name: 'Alice', age: 30 },
  { id: 2, name: 'Bob', age: 25 },
  { id: 3, name: 'Eve', age: 35 },
  { id: 4, name: 'Bob', age: 40 },
];

describe('Unit | Helper | pick', () => {
  it('should exist', () => {
    expect(pick).toBeDefined();
  });

  it('should select specified keys correctly using pick', () => {
    const expected = [
      { id: 1, name: 'Alice' },
      { id: 2, name: 'Bob' },
      { id: 3, name: 'Eve' },
      { id: 4, name: 'Bob' },
    ];

    const actual = pick({ fields: ['id', 'name'], records });

    expect(actual).toEqual(expected);
  });
});