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a1d639ba5d
PR-URL: https://github.com/nodejs/node/pull/35415 Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Myles Borins <myles.borins@gmail.com>
52 lines
1.6 KiB
JavaScript
52 lines
1.6 KiB
JavaScript
// Copyright 2020 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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/**
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* @fileoverview Test random utilities.
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*/
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'use strict';
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const assert = require('assert');
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const sinon = require('sinon');
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const { twoBucketSample } = require('../random.js');
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const sandbox = sinon.createSandbox();
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describe('Two-bucket choosing', () => {
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afterEach(() => {
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sandbox.restore();
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});
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it('with one empty', () => {
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sandbox.stub(Math, 'random').callsFake(() => 0.5);
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assert.deepEqual([1, 2], twoBucketSample([0, 1, 2], [], 1, 2));
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assert.deepEqual([1, 2], twoBucketSample([], [0, 1, 2], 1, 2));
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assert.deepEqual([0], twoBucketSample([0], [], 1, 1));
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assert.deepEqual([0], twoBucketSample([], [0], 1, 1));
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});
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it('chooses with 0.3', () => {
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sandbox.stub(Math, 'random').callsFake(() => 0.3);
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assert.deepEqual([1, 2], twoBucketSample([0, 1, 2], [3, 4, 5], 1, 2));
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// Higher factor.
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assert.deepEqual([3, 5], twoBucketSample([0, 1, 2], [3, 4, 5], 4, 2));
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});
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it('chooses with 0.7', () => {
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sandbox.stub(Math, 'random').callsFake(() => 0.7);
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assert.deepEqual([4, 3], twoBucketSample([0, 1, 2], [3, 4, 5], 1, 2));
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});
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it('chooses with 0.5', () => {
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sandbox.stub(Math, 'random').callsFake(() => 0.5);
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assert.deepEqual([3], twoBucketSample([0, 1], [2, 3, 4, 5], 1, 1));
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assert.deepEqual([3], twoBucketSample([0, 1, 2, 3], [4, 5], 1, 1));
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// Higher factor.
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assert.deepEqual([4], twoBucketSample([0, 1, 2, 3], [4, 5], 2, 1));
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});
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});
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