Node.js built-in test runner in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Node.js built-in test module.

Node.js

import [1] from 'node:test';

Drag options to blanks, or click blank then click option'

Ahttp

Bassert

Cfs

Dtest

Attempts:

3 left

💡 Hint

Common Mistakes

Importing 'assert' instead of 'test'.

Using incorrect module names like 'fs' or 'http'.

The Node.js built-in test runner is imported using test from the node:test module.

2fill in blank

medium

Complete the code to define a test case using the Node.js built-in test runner.

Node.js

test('addition works', () => {
  const result = 2 + 3;
  [1].strictEqual(result, 5);
});

Drag options to blanks, or click blank then click option'

Aconsole

Bassert

Ctest

Drequire

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'console' instead of 'assert' for assertions.

Trying to call 'strictEqual' on 'test' or 'require'.

The assert module is used to check if the test result matches the expected value.

3fill in blank

hard

Fix the error in the test function declaration to correctly use the Node.js test runner.

Node.js

import test from 'node:test';
import assert from 'node:assert';

test('check truth', async () => {
  const value = true;
  [1].ok(value);
});

Drag options to blanks, or click blank then click option'

Aassert

Bconsole

Ctest

Drequire

Attempts:

3 left

💡 Hint

Common Mistakes

Calling 'ok' on 'test' instead of 'assert'.

Using 'console' or 'require' incorrectly.

The assert module provides the ok method to check if a value is truthy.

4fill in blank

hard

Fill both blanks to create a test that checks if a function throws an error.

Node.js

test('throws error', () => {
  [1](() => {
    throw new Error('fail');
  }, [2]);
});

Drag options to blanks, or click blank then click option'

Aassert.throws

Bconsole.log

C/fail/

Dassert.ok

Attempts:

3 left

💡 Hint

Common Mistakes

Using console.log instead of assert.throws.

Passing assert.ok instead of a regex.

The assert.throws method checks if a function throws an error matching the given regular expression.

5fill in blank

hard

Fill the blanks to write a test that checks if an async function resolves correctly.

Node.js

test('async test', async () => {
  const data = await fetchData();
  [1].strictEqual(typeof [2], 'string');
});

Drag options to blanks, or click blank then click option'

Aassert

Bdata

Cdone

Dconsole

Attempts:

3 left

💡 Hint

Common Mistakes

Using done() unnecessarily in async tests with Node.js built-in test runner.

Using console instead of assert.

The assert.strictEqual checks if the type of data is 'string'. The Node.js built-in test runner natively supports async functions with await, so no done() callback is needed.