Support running wpt tests directly using --inject-script.

This uses wpt directly with the new --inject-script support for
injecting polyfills described at:
https://web-platform-tests.org/running-tests/testing-polyfills.html

The previous custom webdriver approach is maintained for compatibility
with saucelabs.

Author: Robert Flack

package-lock.json

@@ -8,10 +8,10 @@
     "build": "microbundle -f iife",
     "dev": "run-all \"serve\" \" microbundle watch -f iife \"",
     "deploy": "npm run build",
-    "test:simple": "./test/setup/wpt-repo.sh && node ./test/webdriver/wpt-server-cli.js",
-    "test:simple-w": "test\\setup\\wpt-repo.sh.bat && node ./test/webdriver/wpt-server-cli.js",
-    "test:webdriver": "./test/setup/wpt-repo.sh && node test/webdriver/index.js",
-    "test:webdriver-w": "test\\setup\\wpt-repo.sh.bat && node test/webdriver/index.js"
+    "test-setup": "node test/setup/checkout-wpt.mjs",
+    "test:wpt": "npm run build && npm run test-setup && cd test && cd wpt && python wpt run --install-webdriver --inject-script ../../dist/scroll-timeline.js chrome scroll-animations",
+    "test:simple": "npm run build && npm run test-setup && cd test && cd wpt && python wpt serve --inject-script ../../dist/scroll-timeline.js",
+    "test:webdriver": "npm run test-setup && node test/webdriver/index.js"
   },
   "repository": {
     "type": "git",

package.json

@@ -1,2 +1,2 @@
 @call config silent
-npm run test:simple-w
+npm run test:simple

run-server-locally.bat

@@ -1,2 +1,2 @@
 @call config silent
-npm run test:webdriver-w
+npm run test:webdriver

run-tests-locally.bat

@@ -0,0 +1,29 @@
+#!/usr/bin/env node
+
+import path from 'path';
+import { fileURLToPath } from 'url';
+import { chdir, exit, env } from 'node:process';
+import { execSync } from 'node:child_process';
+import { existsSync } from 'node:fs';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+const repoUrl = 'https://github.com/web-platform-tests/wpt.git';
+const checkoutDir = 'wpt';
+const command = 'npm install';
+const execEnv = { stdio: [0, 1, 2] };
+
+chdir(__dirname);
+chdir('..');
+
+if (existsSync(checkoutDir)) {
+  console.log(`Checkout ${checkoutDir} already exists, updating`);
+  execSync(`git pull --ff-only`, {...execEnv, cwd: path.resolve(`${__dirname}/../${checkoutDir}`)});
+  exit(0);
+}
+
+execSync(`git clone ${repoUrl}`, {...execEnv, cwd: path.resolve(`${__dirname}/..`)});
+console.warn('Ensure that you setup wpt for local test runs per published instructions: https://web-platform-tests.org/running-tests/from-local-system.html');
+console.log(`Checked out ${checkoutDir}`);
+
+exit(0);