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b46a4fe286
* Google changed from an Inc to an LLC. This happened back in 2017 but we didn’t notice. Officially we should update files from Inc to LLC when they are changed as part of regular edits, but this is a nightmare to remember for the next decade. * Remove project description/titles from licenses This is no longer part of Google’s header requirements. Our existing descriptions were useless (“Visual Blocks Editor”) or grossly obselete (“Visual Blocks Language”). * License no longer requires URL. * Fix license regexps.
84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
/**
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* @license
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* Copyright 2019 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @fileoverview Mocha tests that diff images and save the diffs as artifacts.
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*/
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var chai = require('chai');
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var fs = require('fs'),
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PNG = require('pngjs').PNG,
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pixelmatch = require('pixelmatch');
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var old_dir = 'tests/screenshot/outputs/old/';
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var new_dir = 'tests/screenshot/outputs/new/';
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var diff_dir = 'tests/screenshot/outputs/diff/';
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var test_list_location ='tests/screenshot/test_cases/test_cases.json';
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if (!fs.existsSync(diff_dir)){
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fs.mkdirSync(diff_dir);
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}
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function getTestList() {
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var file = fs.readFileSync(test_list_location);
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var json = JSON.parse(file);
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var testSpecArr = json.tests;
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var testList = [];
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for (var i = 0, testSpec; testSpec = testSpecArr[i]; i++) {
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if (!testSpec.skip) {
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testList.push(testSpec.title);
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}
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}
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return testList;
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}
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var test_list = getTestList();
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suite('Rendering', function() {
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/**
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* - Load the old and new files as PNGs
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* - Diff the files
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* - Assert that the files are the same
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* - Save the visual diff to a file.
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*/
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function diffScreenshots(name) {
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var file1 = fs.readFileSync(old_dir + name + '.png');
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var img1 = PNG.sync.read(file1);
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var file2 = fs.readFileSync(new_dir + name + '.png');
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var img2 = PNG.sync.read(file2);
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var diff = new PNG({width: img1.width, height: img1.height});
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var mismatch_num = pixelmatch(
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img1.data,
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img2.data,
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diff.data,
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img1.width,
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img1.height, {threshold: 0.1});
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diff.pack().pipe(fs.createWriteStream(diff_dir + name + '.png'));
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chai.assert.equal(mismatch_num, 0);
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}
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test_list.forEach(function(testName) {
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test(testName, function() {
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diffScreenshots(testName);
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})
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});
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});
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