Add trivial puppeteer test. Fixes peggyjs#199.

docs/development/test.html

@@ -45,6 +45,7 @@ <h2>Parser Generator for JavaScript</h2>
             <a  href="index.html">Development</a>
         </nav>
 
+        <div id='results'>PASS</div>
         <div id="content">
           <div id="mocha"></div>
         </div>
@@ -57,6 +58,6 @@ <h2>Parser Generator for JavaScript</h2>
     </div>
 </body>
 <script class="mocha-exec">
-  mocha.run();
+  mocha.run(failures => console.log(failures === 0 ? 'PASS' : 'FAIL'));
 </script>
 </html>

web-test/.eslintrc.js

@@ -0,0 +1,8 @@
+"use strict";
+
+module.exports = {
+  parserOptions: {
+    // Puppeteer is *much* nicer to use with async/await.
+    ecmaVersion: 2017,
+  },
+};

web-test/.npmrc

@@ -0,0 +1,2 @@
+engine-strict=true
+package-lock=false

web-test/README.md

@@ -0,0 +1,4 @@
+Rudimentary puppeteer test for peggy.  Separated into a directory so that
+puppeteer (and it's Chromium instance) don't get installed in CI.
+
+If we decide to run these tests in CI later, this can be moved into the tools directory.

web-test/index.js

@@ -0,0 +1,49 @@
+"use strict";
+
+const puppeteer = require("puppeteer");
+const path = require("path");
+
+const TOP = `file://${path.resolve(
+  __dirname, "..", "docs", "development", "test.html",
+)}`;
+
+async function main() {
+  let done = null;
+  const donePromise = new Promise((resolve, reject) => {
+    done = { resolve, reject };
+  });
+  const browser = await puppeteer.launch({
+    slowMo: 100,
+    headless: false,
+    defaultViewport: null,
+  });
+  const pages = await browser.pages();
+  const page = (pages.length > 0) ? pages[0] : await browser.newPage();
+  page
+    .on("console", message => {
+      const txt = message.text();
+      switch (txt) {
+        case "PASS":
+          done.resolve();
+          break;
+        case "FAIL":
+          done.reject();
+          break;
+        default: {
+          const type = message
+            .type()
+            .toUpperCase();
+          console.log(`${type}: ${txt}`);
+        }
+      }
+    })
+    .on("pageerror", ({ message }) => console.log(`ERROR: ${message}`))
+    .on("requestfailed", request => console.log(
+      `FAIL: ${request.failure().errorText} ${request.url()}`,
+    ));
+  await page.goto(TOP, { waitUntil: "load" });
+  await donePromise;
+  await browser.close();
+}
+
+main().catch(console.error);

web-test/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "peggy-web-test",
+  "version": "0.0.0",
+  "private": true,
+  "description": "Test peggy for the web in the browser",
+  "main": "index.js",
+  "scripts": {
+    "test": "node index.js"
+  },
+  "keywords": [],
+  "author": "Joe Hildebrand <[email protected]>",
+  "license": "MIT",
+  "devDependencies": {
+    "puppeteer": "^10.4.0"
+  },
+  "engines": {
+    "node": ">=10"
+  }
+}