update puppeteer and add logs (#4938)

Author: tanhauhau

package-lock.json

@@ -85,7 +85,7 @@
     "magic-string": "^0.25.3",
     "mocha": "^6.2.0",
     "periscopic": "^2.0.1",
-    "puppeteer": "^1.19.0",
+    "puppeteer": "^2.1.1",
     "rollup": "^1.27.14",
     "source-map": "^0.7.3",
     "source-map-support": "^0.5.13",

package.json

@@ -25,7 +25,7 @@ describe('custom-elements', function() {
 	let code;
 
 	function create_server() {
-		return new Promise((fulfil) => {
+		return new Promise((fulfil, reject) => {
 			const server = http.createServer((req, res) => {
 				if (req.url === '/') {
 					res.end(page);
@@ -36,6 +36,8 @@ describe('custom-elements', function() {
 				}
 			});
 
+			server.on('error', reject);
+
 			server.listen('6789', () => {
 				fulfil(server);
 			});
@@ -44,13 +46,16 @@ describe('custom-elements', function() {
 
 	before(async () => {
 		svelte = loadSvelte();
+		console.log('[custom-element] Loaded Svelte');
 		server = await create_server();
+		console.log('[custom-element] Started server');
 		browser = await puppeteer.launch();
+		console.log('[custom-element] Launched puppeteer browser');
 	});
 
 	after(async () => {
-		server.close();
-		await browser.close();
+		if (server) server.close();
+		if (browser) await browser.close();
 	});
 
 	fs.readdirSync(`${__dirname}/samples`).forEach(dir => {