SETUP_VITEST_IN_NODEJS

SETUP_VITEST_IN_NODEJS.md

Setup Vitest in NodeJS Project

1. You have to set up a nodejs project (Recommended version v22.18.0 to use typescript)

   yarn init

2. Create the file tsconfig.json in the root Documentation

  {
    "compilerOptions": {
      "noEmit": true, // Optional - see note below
      "target": "esnext",
      "module": "nodenext",
      "rewriteRelativeImportExtensions": true,
      "erasableSyntaxOnly": true,
      "verbatimModuleSyntax": true
    }
  }

4. You have to install the following packages

   yarn add vitest supertest -D

NOTE: There will be another packages wich the project will require to install in the process such as jsdom and coverage

3. Actualizar los scripts del package.json

   "scripts": {
     ...
     "test": "vitest",
     "test:coverage": "vitest --coverage"
   },

4. Crear la configuración de babel vite.config.ts and vitest.setup.ts

   • vite.config.ts

   /// <reference types="vitest" />
   import { defineConfig } from 'vite'
   
   // https://vite.dev/config/
   export default defineConfig({
     test: {
       // Use jsdom for maximum compatibility and realism; use happy-dom for faster, simpler tests where full browser accuracy is not required.
       environment: "node",
       setupFiles: "./vitest-setup.ts",
       coverage: {
         provider: "v8",
         reporter: ["text", "json", "html"],
         reportsDirectory: './coverage'
       }
     }
   })

   • vitest-setup.ts

5. And you are ready to begin with your first test case

     import {describe, test, expect} from "vitest";
   
     describe('Tests', () => {
      test('Prueba', () => {
        expect(1).toBe(1);
      });
     });