Count Tests

test_database.rb

...
  
  def test_count_happy_path
    db = Database.new

    db.set "Snowy", "Owl"
    assert_equal(1, db.count("Owl"))
    db.set "GreatHorned", "Owl"
    assert_equal(2, db.count("Owl"))
  end

  def test_count_no_value
    db = Database.new

    assert_equal(0, db.count("NoKey"))
  end

...