/**
 * Copyright 2015-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @emails react-core
 */

'use strict';

const update = require('./index');

describe('update', () => {
  // https://facebook.github.io/react/docs/update.html#simple-push
  it('should support simple push', () => {
    const array = [1, 2, 3];

    const newArray = update(array, {$push: [4]});
    expect(array).toEqual([1, 2, 3]);

    expect(newArray).toEqual([1, 2, 3, 4]);
  });

  // https://facebook.github.io/react/docs/update.html#nested-collections
  it('should support nested collections', () => {
    const collection = [1, 2, {a: [12, 17, 15]}];

    const newCollection = update(collection, {2: {a: {$splice: [[1, 1, 13, 14]]}}});
    expect(collection).toEqual([1, 2, {a: [12, 17, 15]}]);

    expect(newCollection).toEqual([1, 2, {a: [12, 13, 14, 15]}]);
  });

  // https://facebook.github.io/react/docs/update.html#updating-a-value-based-on-its-current-one
  it('should support updating a value based on its current one', () => {
    const obj = {a: 5, b: 3};

    const newObj = update(obj, {b: {$apply: function(x) {return x * 2;}}});
    expect(newObj).toEqual({a: 5, b: 6});

    const newObj2 = update(obj, {b: {$set: obj.b * 2}});
    expect(newObj2).toEqual({a: 5, b: 6});

    expect(obj).toEqual({a: 5, b: 3});
  });

  // https://facebook.github.io/react/docs/update.html#shallow-merge
  it('should support shallow merge', () => {
    const obj = {a: 5, b: 3};

    const newObj = update(obj, {$merge: {b: 6, c: 7}});
    expect(newObj).toEqual({a: 5, b: 6, c: 7});

    expect(obj).toEqual({a: 5, b: 3});
  });
});