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

A higher order component decorator for forms using Redux and React

import expect from 'expect';
import { fromJS, List } from 'immutable';
import splice from '../splice';

describe('structure.immutable.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(List).toEqual(fromJS([,, value])); // eslint-disable-line no-sparse-arrays
    });

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

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

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

    it('should insert in out of range', function () {
      expect(splice(fromJS(['a', 'b', 'c']), 5, 0, value)).toBeA(List).toEqual(fromJS(['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(List).toEqual(fromJS([]));
  });

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

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

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

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