Player: Add `initialize` method, use insignia constants

Add an `initialize` method to get rid of our test errors and use the
constants we created in 231060de4c493a9c6ba3510a9be4d405517af5c6 when
creating new `Player`s.

1 files changed, 1 insertions, 1 deletions

diff --git a/spec/player_spec.rb b/spec/player_spec.rb
index 3306095..4dee7e7 100644
--- a/spec/player_spec.rb
+++ b/spec/player_spec.rb
@@ -16,7 +16,7 @@ describe Player do
   describe '#move' do
     before do
       board = Board.new
-      @player = Player.new('X', board)
+      @player = Player.new(Player::INSIGNIAS[:x], board)
     end
     
     it 'raises an ArgumentError given invalid coordinates' do