@oclif/test

What is @oclif/test?

@oclif/test is a testing framework specifically designed for testing oclif-based CLI applications. It provides utilities to simulate command execution, check outputs, and handle various test scenarios.

What are @oclif/test's main functionalities?

Simulate Command Execution

This feature allows you to simulate the execution of a CLI command and check the output. In this example, the command 'hello --name world' is executed, and the test checks if the output contains 'hello world'.

const {expect, test} = require('@oclif/test');

test
  .stdout()
  .command(['hello', '--name', 'world'])
  .it('runs hello --name world', ctx => {
    expect(ctx.stdout).to.contain('hello world');
  });

Check Command Errors

This feature allows you to test how your CLI handles errors. In this example, the command 'hello --name' is missing a required value, and the test checks if the error message contains 'Missing required flag'.

const {expect, test} = require('@oclif/test');

test
  .stderr()
  .command(['hello', '--name'])
  .catch(err => {
    expect(err.message).to.contain('Missing required flag');
  })
  .it('runs hello --name with missing value', ctx => {});

Mocking HTTP Requests

This feature allows you to mock HTTP requests during your tests. In this example, a GET request to 'https://api.example.com/data' is mocked to return 'test data', and the test checks if the command 'fetch-data' outputs 'test data'.

const {expect, test} = require('@oclif/test');
const nock = require('nock');

test
  .nock('https://api.example.com', api => api
    .get('/data')
    .reply(200, {data: 'test data'})
  )
  .stdout()
  .command(['fetch-data'])
  .it('runs fetch-data and mocks HTTP request', ctx => {
    expect(ctx.stdout).to.contain('test data');
  });

Other packages similar to @oclif/test

mocha

Mocha is a feature-rich JavaScript test framework running on Node.js and in the browser, making asynchronous testing simple and fun. While Mocha is a general-purpose testing framework, @oclif/test is specifically designed for testing oclif-based CLI applications.

jest

Jest is a delightful JavaScript Testing Framework with a focus on simplicity. It works with projects using Babel, TypeScript, Node.js, React, Angular, Vue.js, and Svelte. Jest is more general-purpose compared to @oclif/test, which is tailored for oclif CLI applications.

chai

Chai is a BDD / TDD assertion library for node and the browser that can be paired with any JavaScript testing framework. Chai provides assertions that can be used in conjunction with @oclif/test, but it does not provide the CLI-specific testing utilities that @oclif/test offers.

README

@oclif/test

test helpers for oclif components