lodash/test/invert.spec.ts

import assert from 'node:assert';
import invert from '../src/invert';

describe('invert', () => {
    it('should invert an object', () => {
        const object = { a: 1, b: 2 },
            actual = invert(object);

        assert.deepStrictEqual(actual, { '1': 'a', '2': 'b' });
        assert.deepStrictEqual(invert(actual), { a: '1', b: '2' });
    });

    it('should work with values that shadow keys on `Object.prototype`', () => {
        const object = { a: 'hasOwnProperty', b: 'constructor' };
        assert.deepStrictEqual(invert(object), { hasOwnProperty: 'a', constructor: 'b' });
    });

    it('should work with an object that has a `length` property', () => {
        const object = { '0': 'a', '1': 'b', length: 2 };
        assert.deepStrictEqual(invert(object), { a: '0', b: '1', '2': 'length' });
    });

    it('should return a wrapped value when chaining', () => {
        const object = { a: 1, b: 2 },
            wrapped = _(object).invert();

        assert.ok(wrapped instanceof _);
        assert.deepEqual(wrapped.value(), { '1': 'a', '2': 'b' });
    });
});