Random Ruby Quiz –– count words in a phrase

You will need minitest gem:

gem install minitest

Quiz: Write a program that given a phrase can count the occurrences of each word in that phrase. Your code should pass this test suite:

test_phrase.rb

gem "minitest"
require 'minitest/autorun'
require_relative 'phrase'

class PhraseTest < Minitest::Test

  def test_count_one_word
    phrase = Phrase.new("word")
    counts = {"word" => 1}
    assert_equal counts, phrase.word_count
  end

  def test_count_one_of_each
    phrase = Phrase.new("one of each")
    counts = {"one" => 1, "of" => 1, "each" => 1}
    assert_equal counts, phrase.word_count
  end

  def test_count_multiple_occurrences
    phrase = Phrase.new("one fish two fish red fish blue fish")
    counts = {"one"=>1, "fish"=>4, "two"=>1, "red"=>1, "blue"=>1}
    assert_equal counts, phrase.word_count
  end

  def test_count_everything_just_once
    phrase = Phrase.new("all the kings horses and all the kings men")
    phrase.word_count # count it an extra time
    counts = {
      "all"=>2, "the"=>2, "kings"=>2, "horses"=>1, "and"=>1, "men"=>1
    }
    assert_equal counts, phrase.word_count
  end

  def test_ignore_punctuation
    phrase = Phrase.new("car : carpet as java : javascript!!&@$%^&")
    counts = {"car"=>1, "carpet"=>1, "as"=>1, "java"=>1, "javascript"=>1}
    assert_equal counts, phrase.word_count
  end

  def test_handles_cramped_lists
    phrase = Phrase.new("one,two,three")
    counts = {"one"=>1, "two"=>1, "three" => 1}
    assert_equal counts, phrase.word_count
  end

  def test_include_numbers
    phrase = Phrase.new("testing, 1, 2 testing")
    counts = {"testing" => 2, "1" => 1, "2" => 1}
    assert_equal counts, phrase.word_count
  end

  def test_normalize_case
    phrase = Phrase.new("go Go GO")
    counts = {"go" => 3}
    assert_equal counts, phrase.word_count
  end
end

write code in phrase.rb that pass this test suite

.
├── phrase.rb
└── test_phrase.rb

You could run the test via:

ruby test_phrase.rb

Answer is in the comment.