lib/mastermind/game/piece.rb in mastermind-game-0.0.1 vs lib/mastermind/game/piece.rb in mastermind-game-0.0.2

@@ -4,10 +4,10 @@
       COLORS = [:red, :green, :blue, :yellow, :white, :black]
 
       attr_reader :color
 
       def initialize(color: COLORS.sample)
-        raise ArgumentError.new("Invalid color.") unless COLORS.include?(color)
+        raise ArgumentError.new("Invalid color: #{color}.") unless COLORS.include?(color)
         @color = color
       end
 
       def ==(piece)
         piece.is_a?(Piece) && color == piece.color