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 "rspec"

tty-prompt-test.rb

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

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

  def run
    "#{name} #{destiny}"
  end

  def name
    prompt.ask "Name:"
  end

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

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

  before do
    prompt.on :keypress do |e|
      prompt.trigger :keyup   if e.value == "k"
      prompt.trigger :keydown if e.value == "j"
    end
    
    allow(subject).to receive(:prompt).and_return prompt
  end

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

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