jianyu-cli/test/commands/hello/index.test.ts

import { expect, test } from '@oclif/test'

describe('hello', () => {
  test
  .stdout()
  .command(['hello', 'friend', '--from=oclif'])
  .it('runs hello cmd', ctx => {
    expect(ctx.stdout).to.contain('hello friend from oclif!')
  })
})