diff --git a/test/basic.js b/test/basic.js
index 599376c..3bc8b46 100644
--- a/test/basic.js
+++ b/test/basic.js
@@ -2,13 +2,13 @@ const tap = require('tap')
 
 const config = require('../index.js')
 
+const isObject = (object) => {
+  return typeof object === 'object' && object !== null
+}
+
 tap.test('test basic properties of config', async (t) => {
   t.ok(isObject(config.parserOptions))
   t.ok(isObject(config.env))
   t.ok(isObject(config.rules))
   t.ok(isObject(config.overrides))
 })
-
-function isObject(object) {
-  return typeof object === 'object' && object !== null
-}
diff --git a/test/fixtures/top-level-await.mjs b/test/fixtures/top-level-await.mjs
index e814772..b66c7f6 100644
--- a/test/fixtures/top-level-await.mjs
+++ b/test/fixtures/top-level-await.mjs
@@ -1,3 +1,3 @@
 const foo = await 1
-const bar = function () {}
+const bar = () => {}
 await bar(foo)