wix-style-react/src/utils/operators/pick.spec.js

wix-style-react

import pick from './pick';

describe('pick operator', () => {
  it('should return an empty object for non-object input', () => {
    expect(pick(1, ['a'])).toEqual({});
    expect(pick(true, ['a'])).toEqual({});
    expect(pick('', ['a'])).toEqual({});
    expect(pick(null, ['a'])).toEqual({});
    expect(pick(undefined, ['a'])).toEqual({});
    expect(pick(Symbol.for('foo'), ['a'])).toEqual({});
  });

  it('should return an empty object for invalid paths', () => {
    expect(pick({ a: 1 }, {})).toEqual({});
    expect(pick({ a: 1 }, 1)).toEqual({});
    expect(pick({ a: 1 }, true)).toEqual({});
    expect(pick({ a: 1 }, undefined)).toEqual({});
    expect(pick({ a: 1 }, null)).toEqual({});
    expect(pick({ a: 1 }, Symbol.for('foo'))).toEqual({});
  });

  it('should pick a single field', () => {
    const anObject = { a: 1, b: 2 };
    expect(pick(anObject, 'a')).toEqual({ a: 1 });
  });

  it('should pick multiple fields', () => {
    const anObject = { a: 1, b: 2, c: 3 };
    expect(pick(anObject, ['a', 'c'])).toEqual({ a: 1, c: 3 });
  });

  it('should ignore missing paths', () => {
    const anObject = { a: 1, b: 2 };
    expect(pick(anObject, ['a', 'z'])).toEqual({ a: 1 });
  });
});