Node.js built-in test runner in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the Node.js built-in test runner?

It is a simple testing tool included with Node.js that lets you write and run tests without installing extra packages.

beginner

How do you run tests using the Node.js built-in test runner?

Use the command node --test in your terminal to run test files automatically detected by Node.js.

beginner

Which module do you import to write tests with Node.js built-in test runner?

You import the <code>test</code> function from the <code>node:test</code> module to define your tests.

beginner

What is the purpose of assertions in Node.js built-in test runner?

Assertions check if your code behaves as expected. If an assertion fails, the test fails and shows an error.

intermediate

How do you write an asynchronous test using Node.js built-in test runner?

You define the test function as async and use await inside it. The test runner waits for the async code to finish.

Which command runs tests using the Node.js built-in test runner?

A node test.js

B node --test

C npm test

D npm run test

The correct command is node --test which runs tests using the built-in test runner.

Which module provides the test function in Node.js built-in test runner?

A node:test

B assert

C mocha

D jest

The node:test module provides the test function for writing tests.

What happens if an assertion fails in a Node.js built-in test runner test?

A The test runner crashes

B The test passes anyway

C The test fails and shows an error

D Nothing happens

If an assertion fails, the test fails and the error is reported.

How do you write an asynchronous test with Node.js built-in test runner?

A Define the test function as async and use await inside

B Use callbacks only

C Use setTimeout to delay assertions

D Asynchronous tests are not supported

You write async tests by marking the test function async and using await inside it.

Which of these is NOT a feature of Node.js built-in test runner?

A Runs tests without extra packages

B Supports test grouping and hooks

C Automatically detects test files

D Provides a graphical user interface

The built-in test runner does not have a graphical user interface; it runs tests in the terminal.

Explain how to write and run a simple test using the Node.js built-in test runner.

Think about the steps from writing code to running it in terminal.

Describe how asynchronous code is tested using the Node.js built-in test runner.

Consider how async/await works in JavaScript tests.