TDD Word Count - Create an object that takes a long string and returns the frequency of each word in it.

tdd_word_count.rb

class WordTracker
  attr_reader :string
  def initialize(string)
    @string = string
    @word_hash = {}
  end

  def log_lowercase_words
    @words_in_string = @string.split.map.each {|word| word.downcase.to_s}
  end

  def id_unique_words
    @unique_words = log_lowercase_words.uniq
  end

  def count_words(word)
    @words_in_string.count(word)
  end

  def word_count_to_hash
    id_unique_words
    @unique_words.each do |word|
      @word_hash[word] = count_words(word)
    end
    @word_hash
  end
end

word_count_spec.rb

require 'rspec'
require_relative 'tdd_word_count'

describe WordTracker do

  it 'should only initialize with a string as an argument' do
    words = WordTracker.new('Toy boat toy boat toy boat')
    expect(words.string.class).to eql(String)
  end

  it 'should handle words of varying cases' do
    words = WordTracker.new('Toy boat toy boat toy boat')
    expect(words.log_lowercase_words).to eql(["toy", "boat", "toy", "boat", "toy", "boat"])
  end

  it 'should identify each unique word in the string' do
    words = WordTracker.new('Toy boat toy boat toy boat')
    expect(words.id_unique_words).to eql(['toy', 'boat'])
  end

  it 'should count the number of times a word appears in the given string' do
    words = WordTracker.new('Toy boat toy boat toy boat')
    words.log_lowercase_words
    expect(words.count_words('toy')).to eql(3)
  end

  it 'should add each unique word in the string and its word count to an array' do
    words = WordTracker.new('Toy boat toy boat toy boat')
    expect(words.word_count_to_hash).to eql({"toy"=>3, "boat"=>3})
  end
end