test_count_frequency.rb

require_relative 'count_word_frequency.rb'
require 'test/unit'

class TestCountFrequency < Test::Unit::TestCase
  def test_empty_list
    assert_equal({}, count_frequency([]))
  end

  def test_single_word
    assert_equal({"cat" => 1}, count_frequency(["cat"]))
  end

  def test_two_different_word
    assert_equal({"cat" => 1, "sat" => 1}, count_frequency(["cat", "sat"]))
  end

  def test_two_words_with_adjacent_repeat
    assert_equal({"cat" => 2, "sat" => 1}, count_frequency(["cat", "cat", "sat"]))
  end

  def test_two_words_with_non_adjacent_repeat
    assert_equal({"cat" => 2, "sat" => 1}, count_frequency(["cat", "sat", "cat"]))
  end

end