Step 1: Set Up Your TypeScript Project
Create a new folder
mkdir test
cd test
Create a new TypeScript project.
Initialize your project and create a package.json file if you don't have one already:
pnpm init
pnpm init -y
Install TypeScript and Jest as development dependencies:
npm i jest typescript ts-jest ts-node @types/jest @types/node -D
pnpm add jest typescript ts-jest ts-node @types/jest @types/node -D
Step 2: Configure TypeScript
Create a tsconfig.json file to configure TypeScript.
You can use the tsc --init command or create it manually.
{
"compilerOptions": {
"target": "ES6",
"module": "CommonJS",
"outDir": "./dist",
"rootDir": "./src"
}
},
"include": [
"src"
]
Create a jest.config.ts file to configure Jest
pnpm create jest
import type {Config} from 'jest';
const config: Config = {
collectCoverage: true,
coverageProvider: "v8",
preset: 'ts-jest',
roots: [
"<rootDir>"
],
testEnvironment: "node",
verbose: true,
transform: {}
}
Create a src directory for your TypeScript source files and a tests directory for your test files.
Creates a file insider the folder src you migh named operation.ts
export function Sum(a: number, b: number): number {
return a + b;
}
import the file we created in the test location into a new file named operation.test.ts or operation.spec.ts
import { Sum} from "../src/operation";
describe("Math functions", () => {
test("should add two numbers correctly", () => {
expect(add(1, 2)).toEqual(3);
});
});
Step 3: Run Your Tests
Add a script to your package.json to run the tests:
"scripts": {
"test": "jest"
}
Run your tests using:
npm run test
pnpm run test
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