Simple Fake Console

Create fake consoles for testing purpose

Usage

Use it directly

const { ConsoleInstance, ActionType, getString } = require('simple-fake-console')
const console = new ConsoleInstance()

console.log('hello', 'world')
console.info(0, 1, 2, 3)
console.error(new Error('foo'))
console.warn('Warning')
console.clear()

// Get all actions
//
// Result: Array<
//   {
//     type: 'log' | 'info' | 'error' | 'warn',
//     data: any[]
//   } | {
//     type: 'clear'
//   }
// >
console.getActions()

// Get string from selected types of actions
//
// Result: string
getString({
  console,
  types: [ActionType.Log, ActionType.Info]
})

Use it in test via dependency injection

// main.ts

import { Console } from 'simple-fake-console'

export function main (console: Console) {
  console.log('hello', 'world')
}

// test.ts

import assert from 'assert'
import { ConsoleInstance, ActionType, getString } from 'simple-fake-console'
import { main } from './main'

const fakeConsole = new ConsoleInstance()
main(fakeConsole)

assert.deepStrictEqual(
  fakeConsole.getActions(),
  [{
    type: 'log',
    data: ['hello', 'world']
  }]
)

assert.strictEqual(
  getString({ console, types: [ActionType.Log] }),
  'hello world'
)

License

MIT © Hoàng Văn Khải