/
accumulateInto-test.internal.js
49 lines (42 loc) · 1.2 KB
/
accumulateInto-test.internal.js
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/**
* Copyright (c) 2014-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @emails react-core
*/
'use strict';
var accumulateInto;
describe('accumulateInto', () => {
beforeEach(() => {
accumulateInto = require('events/accumulateInto').default;
});
it('throws if the second item is null', () => {
expect(function() {
accumulateInto([], null);
}).toThrowError(
'accumulateInto(...): Accumulated items must not be null or undefined.',
);
});
it('returns the second item if first is null', () => {
var a = [];
expect(accumulateInto(null, a)).toBe(a);
});
it('merges the second into the first if first item is an array', () => {
var a = [1, 2];
var b = [3, 4];
accumulateInto(a, b);
expect(a).toEqual([1, 2, 3, 4]);
expect(b).toEqual([3, 4]);
var c = [1];
accumulateInto(c, 2);
expect(c).toEqual([1, 2]);
});
it('returns a new array if first or both items are scalar', () => {
var a = [2];
expect(accumulateInto(1, a)).toEqual([1, 2]);
expect(a).toEqual([2]);
expect(accumulateInto(1, 2)).toEqual([1, 2]);
});
});