try to deflake tests

test/runtime-puppeteer/index.ts

@@ -57,8 +57,6 @@ async function launchPuppeteer() {
 const assert = fs.readFileSync(`${__dirname}/assert.js`, 'utf-8');
 
 describe('runtime (puppeteer)', function() {
-	// Note: Increase the timeout in preparation for restarting Chromium due to SIGSEGV.
-	this.timeout(10000);
 	before(async () => {
 		svelte = loadSvelte(false);
 		console.log('[runtime-puppeteer] Loaded Svelte');
@@ -75,7 +73,7 @@ describe('runtime (puppeteer)', function() {
 
 	const failed = new Set();
 
-	function runTest(dir, hydrate) {
+	function runTest(dir, hydrate, is_first_run) {
 		if (dir[0] === '.') return;
 		// MEMO: puppeteer can not execute Chromium properly with Node8,10 on Linux at GitHub actions.
 		const { version } = process;
@@ -254,11 +252,14 @@ describe('runtime (puppeteer)', function() {
 					prettyPrintPuppeteerAssertionError(err.message);
 					assertWarnings();
 				});
-		});
+		}).timeout(is_first_run ? 20000 : 10000);
 	}
 
+	// Increase the timeout on the first run in preparation for restarting Chromium due to SIGSEGV.
+	let first_run = true;
 	fs.readdirSync(`${__dirname}/samples`).forEach(dir => {
-		runTest(dir, false);
-		runTest(dir, true);
+		runTest(dir, false, first_run);
+		runTest(dir, true, first_run);
+		first_run = false;
 	});
 });