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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>
76 lines
2.0 KiB
JavaScript
76 lines
2.0 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 helpers.
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*/
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'use strict';
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const assert = require('assert');
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const path = require('path');
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const fs = require('fs');
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const sourceHelpers = require('../source_helpers.js');
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const BASE_DIR = path.join(path.dirname(__dirname), 'test_data');
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const DB_DIR = path.join(BASE_DIR, 'fake_db');
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const HEADER = `// 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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/**
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* Create a function that returns one of `probs` when called. It rotates
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* through the values. Useful to replace `random.random()` in tests using
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* the probabilities that trigger different interesting cases.
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*/
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function cycleProbabilitiesFun(probs) {
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let index = 0;
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return () => {
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index = index % probs.length;
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return probs[index++];
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};
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}
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/**
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* Replace Math.random with a deterministic pseudo-random function.
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*/
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function deterministicRandom(sandbox) {
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let seed = 1;
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function random() {
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const x = Math.sin(seed++) * 10000;
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return x - Math.floor(x);
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}
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sandbox.stub(Math, 'random').callsFake(() => { return random(); });
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}
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function loadTestData(relPath) {
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return sourceHelpers.loadSource(BASE_DIR, relPath);
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}
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function assertExpectedResult(expectedPath, result) {
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const absPath = path.join(BASE_DIR, expectedPath);
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if (process.env.GENERATE) {
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fs.writeFileSync(absPath, HEADER + result.trim() + '\n');
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return;
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}
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// Omit copyright header when comparing files.
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const expected = fs.readFileSync(absPath, 'utf-8').trim().split('\n');
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expected.splice(0, 4);
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assert.strictEqual(expected.join('\n'), result.trim());
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}
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module.exports = {
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BASE_DIR: BASE_DIR,
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DB_DIR: DB_DIR,
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assertExpectedResult: assertExpectedResult,
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cycleProbabilitiesFun: cycleProbabilitiesFun,
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deterministicRandom: deterministicRandom,
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loadTestData: loadTestData,
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}
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