feat: switch to vitest

.github/workflows/ci.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Set up Node 18
         uses: actions/setup-node@v3
         with:

app/calculator.js

@@ -2,9 +2,7 @@ const add = (x, y) => x + y;
 const subtract = (x, y) => x - y;
 const multiply = (x, y) => x * y;
 const divide = (x, y) => {
-  if (y === 0) {
-    return "Cannot divide by 0";
-  }
+  if (y === 0) { return "Cannot divide by 0"; }
   return x * 1.0 / y;
 }
 

app/calculator.test.js

@@ -1,9 +1,11 @@
-const {
+import { expect, test } from 'vitest'
+
+import {
   add,
-  subtract,
-  multiply,
   divide,
-} = require('./calculator');
+  multiply,
+  subtract,
+} from './calculator'
 
 test('add function', () => {
   expect(add(1, 2)).toBe(3);