test: use Vitest for testing

Signed-off-by: Alfi Maulana <alfi.maulana.f@gmail.com>

README.md

@@ -8,7 +8,7 @@ This template provides a basic Node.js project containing a sample library writt
 
 - Minimal Node.js project written in TypeScript with [ESM](https://nodejs.org/api/esm.html) support.
 - Uses [Yarn](https://yarnpkg.com/) as the package manager, with [Plug'n'Play](https://yarnpkg.com/features/pnp) support.
-- Supports formatting with [Prettier](https://prettier.io/), linting with [ESLint](https://eslint.org/), and testing with [Jest](https://jestjs.io/).
+- Supports formatting with [Prettier](https://prettier.io/), linting with [ESLint](https://eslint.org/), and testing with [Vitest](https://vitest.dev/).
 - Preconfigured workflows for [Dependabot](https://docs.github.com/en/code-security/dependabot) and [GitHub Actions](https://github.com/features/actions).
 
 ## Usage
@@ -82,7 +82,7 @@ yarn build
 
 ### Testing the Library
 
-Test files in this template are named `*.test.ts` and typically correspond to the source files being tested. This template uses [Jest](https://jestjs.io/) as the testing framework. For more information on testing with Jest, refer to [this documentation](https://jestjs.io/docs/getting-started).
+Test files in this template are named `*.test.ts` and typically correspond to the source files being tested. This template uses [Vitest](https://vitest.dev/) as the testing framework. For more information on testing with Vitest, refer to [this documentation](https://vitest.dev/guide/).
 
 After creating your test files, run tests with:
 

package.json

@@ -26,22 +26,21 @@
     "format": "prettier --write --cache .",
     "lint": "eslint",
     "prepack": "tsc",
-    "test": "jest"
+    "test": "vitest"
   },
   "dependencies": {
     "yargs": "^17.7.2"
   },
   "devDependencies": {
     "@eslint/js": "^9.17.0",
-    "@types/jest": "^29.5.14",
     "@types/node": "^22.10.2",
     "@types/yargs": "^17.0.33",
+    "@vitest/coverage-v8": "^2.1.8",
     "eslint": "^9.17.0",
-    "jest": "^29.7.0",
     "prettier": "^3.4.2",
-    "ts-jest": "^29.2.5",
     "typescript": "^5.7.2",
-    "typescript-eslint": "^8.18.2"
+    "typescript-eslint": "^8.18.2",
+    "vitest": "^2.1.8"
   },
   "packageManager": "yarn@4.5.3"
 }

src/sequence.test.ts

@@ -1,3 +1,4 @@
+import { it, expect } from "vitest";
 import { fibonacciSequence } from "./sequence.js";
 
 it("should generate a fibonacci sequence", () => {

vitest.config.ts

@@ -0,0 +1,13 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    watch: false,
+    coverage: {
+      all: false,
+      enabled: true,
+      reporter: ["text"],
+      thresholds: { 100: true },
+    },
+  },
+});