chore: switch to jest for testing

test/multi-entry/test.js

@@ -1,6 +1,6 @@
 import {resolve, join, dirname} from "node:path";
+import {test, expect} from "@jest/globals";
 
-import test from "ava";
 import { rollup } from "rollup";
 import {debugPrintOutput, getCode} from "../util/index.ts";
 
@@ -17,7 +17,7 @@ const __dirname = dirname(fileURLToPath(import.meta.url));
 process.chdir(join(__dirname, 'fixtures'));
 
 
-test.serial('multi-entry', async (t) => {
+test('multi-entry', async () => {
   const bundle = await rollup({
     input: {
       ['index']: 'index.html',
@@ -30,7 +30,7 @@ test.serial('multi-entry', async (t) => {
   });
   const code = await getCode(bundle, output);
   debugPrintOutput('multi-entry',code);
-  t.snapshot(code);
+  expect(code).toMatchSnapshot();
 });
 
 // TODO various parameters