@breautek/merge-change/test/utils.set.spec.js

Simple library for deep merge of objects and other types (also for patch and immutable updates). Declarative operations to specific merge, for example to remove properties. Customize merging between specific types. Calculating diffs.

const utils = require('../utils.js');
const methods = require('../methods.js');

describe('Test set()', () => {

  test('set deep property', () => {
    const data = {
      prop: {},
    };
    utils.set(data, '/prop/deep/superDeep', 'new', false, '/');
    expect(data).toEqual({
      prop: {
        deep: {
          superDeep: 'new',
        },
      },
    });
  });

  test('set array element', () => {
    const data = {
      items: [
        'value1',
        'value2',
      ],
    };
    utils.set(data, '/items/1', 'new', false, '/');
    expect(data).toEqual({
      items: [
        'value1',
        'new',
      ],
    });
  });

  test('set to custom object', () => {
    class Custom {
      constructor(value = {}) {
        this.value = value;
      }

      [methods.toOperation]() {
        return this.value;
      }

      toJSON() {
        return this.value;
      }
    }

    let data = new Custom({
      name: 'Test',
      sub: {
        prop: {
          inner: 100,
        },
      },
    });

    utils.set(data, 'sub.prop.inner2', 200, false, '.');

    expect(utils.plain(data)).toEqual({
      name: 'Test',
      sub: {
        prop: {
          inner: 100,
          inner2: 200,
        },
      },
    });
  });
});