Apprendre Ruby: semaine #2

# A triangle method
def triangle(a, b, c)
  
  if (a <= 0) || (b <= 0) || (c <= 0)
    raise TriangleError, "a or b or c can't be 0 or negative"
    
  elsif ((a + b) <= c) || ((a + c) <= b) || ((c + b) <= a)
    raise TriangleError, "sum of first and second smallest must be > third"
  
  elsif (a == b) && (b == c)
    :equilateral
  elsif (a == b && a != c) || (a == c && c != b) || (b == c && b != a)
    :isosceles
  elsif (a != b) && (a != c) && (b != c)
    :scalene
  end
end

# A dice class with some requirements (see below)
class DiceSet
  def initialize
    @h = {}
  end
      
  def roll(number)
    @h.clear
    number.times do |i|
      @h[i + 1] = rand(6) + 1
    end
    @h
  end
  
  def values
    @h.values
  end
end

# Not written by me
  def test_can_create_a_dice_set
    dice = DiceSet.new
    assert_not_nil dice
  end

  def test_rolling_the_dice_returns_a_set_of_integers_between_1_and_6
    dice = DiceSet.new

    dice.roll(5)
    assert dice.values.is_a?(Array), "should be an array"
    assert_equal 5, dice.values.size
    dice.values.each do |value|
      assert value >= 1 && value <= 6, "value #{value} must be between 1 and 6"
    end
  end

  def test_dice_values_do_not_change_unless_explicitly_rolled
    dice = DiceSet.new
    dice.roll(5)
    first_time = dice.values
    second_time = dice.values
    assert_equal first_time, second_time
  end

  def test_dice_values_should_change_between_rolls
    dice = DiceSet.new

    dice.roll(5)
    first_time = dice.values

    dice.roll(5)
    second_time = dice.values

    assert_not_equal first_time, second_time,
      "Two rolls should not be equal"
  end

  def test_you_can_roll_different_numbers_of_dice
    dice = DiceSet.new

    dice.roll(3)
    assert_equal 3, dice.values.size

    dice.roll(1)
    assert_equal 1, dice.values.size
  end