Demonstrating TTY Prompt testing with rspec

README.md

Run with:

$ bundle
$ bundle exec rspec tty-prompt-test.rb

Gemfile

# frozen_string_literal: true

source "https://rubygems.org"

git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }

gem "tty-prompt", github: 'piotrmurach/tty-prompt'
gem "tty-testing", github: 'DanielVartanov/tty-testing'
gem "rspec"

tty-prompt-test.rb

require 'tty-prompt'
require "tty/prompt/test"

class Subject
  def initialize(prompt=nil)
    @prompt = prompt
  end

  def run
    prompt.say "#{name} #{destiny}"
  end

  def name
    prompt.ask "Name:"
  end

  def destiny
    prompt.select("Destiny:", %w(Scorpion Kano Jax))
  end

  protected

  def prompt
    @prompt ||= TTY::Prompt.new
  end
end

describe Subject do
  let(:prompt) { TTY::Prompt::Test.new }

  subject do
    Subject.new(prompt)
  end

  before do
    prompt.on :keypress do |e|
      prompt.trigger :keyup   if e.value == "k"
      prompt.trigger :keydown if e.value == "j"
    end
  end

  it "works" do
    prompt.input << "Danny" << "\n" << "j" << "\n"
    prompt.input.rewind
    subject.run
    expect(prompt.output.string).to end_with "Danny Kano\n"
  end

  it "works for sure" do
    prompt.input << "Danny" << "\n" << "j" << "j" << "\n"
    prompt.input.rewind
    subject.run
    expect(prompt.output.string).to end_with "Danny Jax\n"
  end
end

tty-testing-test.rb

require "tty/prompt"
require "tty/testing"

class Subject
  def initialize(input, output)
    @input = input
    @output = output
  end

  def run
    prompt.say "#{name} #{destiny}"
  end

  def name
    prompt.ask "Name:"
  end

  def destiny
    prompt.select("Destiny:", %w(Scorpion Kano Jax))
  end

  protected

  def prompt
    @prompt ||= TTY::Prompt.new(input: @input, output: @output)
  end
end

describe Subject do
  let(:app) do
    TTY::Testing.app_wrapper do |input, output|
      Subject.new(input, output).run
    end
  end

  before { app.run! }

  it "works" do
    app.input.puts "Danny"
    app.input.puts "\e[B" # press arrow down and enter
    expect(app.output).to end_with "Danny Kano\n"
  end

  it "works for sure" do
    app.input.puts "Danny"
    app.input.puts "\e[B\e[B" # press arrow down twice and enter
    expect(app.output).to end_with "Danny Jax\n"
  end
end