Kings are obstructed

lib/chess/moves/king.ex

@@ -1,12 +1,12 @@
 defmodule Chess.Moves.King do
   @moduledoc false
 
-  def moves(_board, {file, rank}) do
-    patterns()
-    |> Enum.map(fn ({fv, rv}) -> {file + fv, rank + rv} end)
-    |> Enum.reject(fn ({file, rank}) ->
-      file < 0 || rank < 0 || file > 7 || rank > 7
-    end)
+  alias Chess.Moves.Generator
+
+  def moves(board, {file, rank}) do
+    board["#{file},#{rank}"]
+    |> Map.get("colour")
+    |> Generator.moves(board, {file, rank}, patterns())
   end
 
   defp patterns do

test/chess/moves/king_test.exs

@@ -13,12 +13,25 @@ defmodule Chess.Moves.KingTest do
     assert Enum.sort(moves) == expected_moves
   end
 
-  test "knights cannot move beyond the edges of the board" do
-    board = %{"0,0" => %{"type" => "knight", "colour" => "white"}}
+  test "kings cannot move beyond the edges of the board" do
+    board = %{"0,0" => %{"type" => "king", "colour" => "white"}}
     moves = Moves.available(board, {0, 0})
 
     expected_moves = Enum.sort([
-      {1, 2}, {2, 1}
+      {0, 1}, {1, 1}, {1, 0},
+    ])
+    assert Enum.sort(moves) == expected_moves
+  end
+
+  test "kings are blocked by pieces of the same colour" do
+    board = %{
+      "0,0" => %{"type" => "king", "colour" => "white"},
+      "1,1" => %{"type" => "rook", "colour" => "white"},
+    }
+    moves = Moves.available(board, {0, 0})
+
+    expected_moves = Enum.sort([
+      {0, 1}, {1, 0},
     ])
     assert Enum.sort(moves) == expected_moves
   end