react-native/Libraries/Utilities/__tests__/mapWithSeparator-test.js

56 lines
1.3 KiB
JavaScript

/**
* Copyright (c) 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.
*/
'use strict';
describe('mapWithSeparator', () => {
const mapWithSeparator = require('mapWithSeparator');
it('mapWithSeparator returns expected results', () => {
const array = [1, 2, 3];
const result = mapWithSeparator(
array,
function(value) {
return value * 2;
},
function() {
return 0;
}
);
expect(result).toEqual([2, 0, 4, 0, 6]);
});
it('mapWithSeparator indices are correct', () => {
const array = [1, 2, 3];
const result = mapWithSeparator(
array,
function(value, index) {
return index;
},
function(index) {
return index;
}
);
expect(result).toEqual([0, 0, 1, 1, 2]);
});
it('mapWithSeparator passes correct array and indices', () => {
const array = [3, 2, 1];
const result = mapWithSeparator(
array,
function(value, index, arr) {
return arr[index];
},
function(index) {
return index;
}
);
expect(result).toEqual([3, 0, 2, 1, 1]);
});
});