redux-form/es/structure/plain/__tests__/splice.spec.js

A higher order component decorator for forms using Redux and React

import expect from 'expect';
import splice from '../splice';

describe('structure.plain.splice', function () {
  var testInsertWithValue = function testInsertWithValue(value) {
    it('should insert even when initial array is undefined', function () {
      expect(splice(undefined, 2, 0, value)) // really goes to index 0
      .toBeA('array').toEqual([,, value]); // eslint-disable-line no-sparse-arrays
    });

    it('should insert ' + value + ' at start', function () {
      expect(splice(['b', 'c', 'd'], 0, 0, value)).toBeA('array').toEqual([value, 'b', 'c', 'd']);
    });

    it('should insert ' + value + ' at end', function () {
      expect(splice(['a', 'b', 'c'], 3, 0, value)).toBeA('array').toEqual(['a', 'b', 'c', value]);
    });

    it('should insert ' + value + ' in middle', function () {
      expect(splice(['a', 'b', 'd'], 2, 0, value)).toBeA('array').toEqual(['a', 'b', value, 'd']);
    });

    it('should insert ' + value + ' when index is out of range', function () {
      expect(splice(['a', 'b', 'c'], 5, 0, value)).toBeA('array').toEqual(['a', 'b', 'c',,, value]); // eslint-disable-line no-sparse-arrays
    });
  };

  testInsertWithValue('value');
  testInsertWithValue(undefined);

  it('should return empty array when removing and initial array is undefined', function () {
    expect(splice(undefined, 2, 1)).toBeA('array').toEqual([]);
  });

  it('should remove at start', function () {
    expect(splice(['a', 'b', 'c', 'd'], 0, 1)).toBeA('array').toEqual(['b', 'c', 'd']);
  });

  it('should remove in the middle then insert in that position', function () {
    expect(splice(['a', 'b', 'c', 'd'], 1, 1, 'e')).toBeA('array').toEqual(['a', 'e', 'c', 'd']);
  });

  it('should remove at end', function () {
    expect(splice(['a', 'b', 'c', 'd'], 3, 1)).toBeA('array').toEqual(['a', 'b', 'c']);
  });

  it('should remove in middle', function () {
    expect(splice(['a', 'b', 'c', 'd'], 2, 1)).toBeA('array').toEqual(['a', 'b', 'd']);
  });
});