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command-test

The easy way to test commands.

Install

npm i command-test --save

Docs

command(cmd)

This function runs the given command.

Returns a <Promise> that resolves to a Command object.

const command = require('command-test')

async function example() {
  const cmd = await command('node -v')

  cmd.code // 0
  cmd.out // "v8.1.4"
  cmd.err // ""
}

example()

command.works(cmd)

This function runs the given command. If the command's exit code is not 0, an error gets thrown.

Returns a <Promise> that resolves to a Command object.

const command = require('command-test')

async function example() {
  const cmd = await command.works('node -v')
  command.code // 0
  command.out // "v8.1.4"
  command.err // ""

  await command.fails('non-existent-command')
  // Throws an error because the command has an exit code 1
}

example()

command.fails(cmd)

This function runs the given command. If the command's exit code is 0, an error gets thrown.

Returns a <Promise> that resolves to a Command object.

const command = require('command-test')

async function example() {
  const cmd = await command.fails('non-existent-command')
  cmd.code // 1
  cmd.err // "/bin/sh: 1: huhn: not found\n"
  cmd.out // ""

  await command.fails('node -v')
  // Throws an error because the command has an exit code 0
}

example()

Class: Command

Represents a command.

This class extends BetterEvents. Therefore you can await events if you don't pass a listener to the .once() method.

Example

const { Command } = require('command-test')

async function example() {
  const command = new Command('node -v')

  await command.once('done')

  command.code // 0
  command.out // "v8.1.4"
  command.err // ""
}

example()

Event: "done"

This event is emitted as soon as the command exits.

await command.once('done')

// or
command.once('done', () => {

})

// or
command.on('done', () => {

})

Property: out

This property is a <string> that stores everything that the command has written to the stdout stream.

Property: err

This property is a <string> that stores everything that the command has written to the stderr stream.

Property: code

This property stores the exit code <number> of the command.

Property: stdout

This property is a reference to the stdout of the command's child_process

Property: stderr

This property is a reference to the stderr of the command's child_process