In_check?

app/models/game.rb

@@ -69,5 +69,21 @@ def populate_board!
       y2 = 7
       color = 0
     end  
+
+  end
+
+  def in_check?(color)
+    king = pieces.find_by(type: 'king', color: color)
+    opponents_pieces = pieces(!color)
+
+    opponents_pieces.each do |piece|
+      if piece.valid_move?(king.x_position, king.y_position)
+        @checking_piece = piece
+        return true
+      else
+        return false
+      end
+    end
   end
+
 end

app/views/shared/_chessboard.html.erb

@@ -10,7 +10,7 @@
           <% 1.upto(8) do |col| %>
             <td class= "<%= board_squares(row) %>">
               <%= link_to piece_path(id: @select_pc.id, x_position: col, y_position: row), method: :put do %>
-                <div class="squares">
+                <div class="squares draggable">
                   <%  @pieces.detect do |piece| %>
                     <% if piece.x_position == col && piece.y_position == row %>
                       <%= link_to piece_color(piece), piece_path(piece.id), :class => hilite(piece) %>

test/models/in_check_test.rb

@@ -0,0 +1,16 @@
+require 'test_helper'
+
+class GameInCheckTest < ActiveSupport::TestCase
+  test "game in check state" do
+     g = Game.create
+     expected = true
+
+     p = g.pieces.find_by(x_position: 4, y_position: 2, type: 'pawn', color: "black")
+     k = g.pieces.find_by(x_position: 5, y_position: 1, color: "white", type: 'King')
+
+     p.valid_move?(king.x_position: 5, king.y_position: 1)
+
+     assert_equal true, g.in_check?(1)
+  end
+
+end