Braille Letters

braille_letters.rb

require 'pry'

class FileReader
  def self.input_filename
    ARGV[0]
  end
  
  def read
    filename = FileReader.input_filename
    File.read(filename)
  end
end

class NightWriter
  attr_reader :reader, :string

  def initialize
    @reader = FileReader.new
    @string = reader.read
  end

  ALPHABET_TO_BRAILLE = {
    "a" => ["0.", "..", ".."],
    "b" => ["0.", "0.", ".."],
    "c" => ["00", "..", ".."],
    "d" => ["00", ".0", ".."],
    "e" => ["0.", ".0", ".."],
    "f" => ["00", "0.", ".."],
    "g" => ["00", "00", ".."],
    "h" => ["0.", "00", ".."],
    "i" => [".0", "0.", ".."],
    "j" => [".0", "00", ".."],
    "k" => ["0.", "..", "0."],
    "l" => ["0.", "0.", "0."],
    "m" => ["00", "..", "0."],
    "n" => ["00", ".0", "0."],
    "o" => ["0.", ".0", "0."],
    "p" => ["00", "0.", "0."],
    "q" => ["00", "00", "0."],
    "r" => ["0.", "00", "0."],
    "s" => [".0", "0.", "0."],
    "t" => [".0", "00", "0."],
    "u" => ["0.", "..", "00"],
    "v" => ["0.", "0.", "00"],
    "w" => [".0", "00", ".0"],
    "x" => ["00", "..", "00"],
    "y" => ["00", ".0", "00"],
    "z" => ["0.", ".0", "00"]
  }

  BRAILLE_TO_ALPHABET = ALPHABET_TO_BRAILLE.invert
end

braille_letters_test.rb

require './braille_letters'
require 'minitest'
require 'minitest/autorun'
require 'minitest/pride'

class NightWriterTest < Minitest::Test
  def setup
    @file = File.new("tempfile.txt", "w")
	@file.print("TEST TEST TEST")
	@file.close
  end

  def teardown
  	File.delete("tempfile.txt")
  end

  def test_it_can_read_file
	  FileReader.stub(:input_filename, -> { @file }) do
      night = NightWriter.new
      assert_equal "TEST TEST TEST", night.string
    end
  end
end