[piexwasm] Add tests.js: a Puppeteer script to run the tests

Option --debug allows visual inspection: add 2 second delay after each
test for those who like to watch.

No-try: true
Bug: 935285
Change-Id: Iee8dd1c6edccacb867af31e73bd8ec972578f077
Reviewed-on: https://chromium-review.googlesource.com/c/1493337
Commit-Queue: Noel Gordon <noel@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636309}

ui/file_manager/image_loader/piex/tests.js

+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+const example = 'node tests http://localhost:8123/tests.html [options]';
+
+const program = require('commander');
+
+program.usage('server [options]')
+  .description('piex wasm raw image preview test runner')
+  .option('-d, --debug' , 'enable debug mode');
+
+program.on('--help', function help() {
+  const text = require('chalk');
+  console.log('');
+  console.log(text.blue('  % ' + example));
+  console.log('');
+});
+
+program.parse(process.argv);
+if (process.argv.length < 3) {
+  program.help();
+  process.exit(1);
+}
+
+const puppeteer = require('puppeteer');
+
+(async function main() {
+  if (program.debug) {
+    console.log(puppeteer.defaultArgs());
+  }
+
+  const browser = await puppeteer.launch({
+    headless: !program.debug
+  });
+
+  let page = await browser.newPage();
+
+  await page.setViewport({
+    width: 1200, height: 800
+  });
+
+  if (program.debug) {
+    page.on('request', (request) => {
+      console.log('Request: ', request.url());
+    });
+  }
+
+  page.on('console', message => {
+    console.log(message.text());
+  });
+
+  await page.goto(process.argv[2], {
+    waitUntil: 'networkidle2'
+  });
+
+  await page.mainFrame().waitForFunction('document.title == "READY"');
+
+  const sleep = (time) => {
+    return new Promise(resolve => setTimeout(resolve, time));
+  };
+
+  const images = [
+    "images/SONY_A500_01.ARW",
+    "images/EOS_XS_REBEL.CR2",
+    "images/RAW_CANON_1DM2.CR2",
+    "images/L100_4220.DNG",
+    "images/RAW_LEICA_M8.DNG",
+    "images/FUJI_E550_RAW.RAF",
+    "images/NIKON_UB20_O35.NEF",
+    "images/NIKON_GDN0447.NEF",
+    "images/OLYMPUS_SC877.ORF",
+    "images/NIKON_CPIX78.NRW",
+    "images/PANASONIC_DMC.RW2",
+    "images/UNKNOWN_FORMAT.JPG",
+  ];
+
+  for (let i = 0; i < images.length; ++i) {
+    await page.evaluate((image) => {
+      window.runTest(image);
+    }, images[i]);
+
+    await page.mainFrame().waitForFunction('document.title == "DONE"');
+
+    if (program.debug) {
+      await sleep(2000);
+    }
+  }
+
+  browser.close();
+
+})();