Basic movements.

games/maze/lib/maze/map.rb

@@ -4,14 +4,22 @@ def self.load(path)
 
   def initialize(blueprint, player1_start, player2_start)
     @blueprint = blueprint.split("\n").map { |row| row.scan(/./) }
-    @player1_position = player1_start
-    @player2_position = player2_start
+    @positions = { '1' => player1_start, '2' => player2_start }
   end
 
   def state
     state = @blueprint.dup
-    state[@player1_position.first][@player1_position.last] = '1'
-    state[@player2_position.first][@player2_position.last] = '2'
+    state[@positions['1'].first][@positions['1'].last] = '1'
+    state[@positions['2'].first][@positions['2'].last] = '2'
     state.map(&:join).join("\n")
   end
+
+  def move(player, direction)
+    axis = ['E', 'W'].include?(direction) ? 1 : 0
+    movement = ['N', 'W'].include?(direction) ? -1 : 1
+
+    @positions[player][axis] += movement
+    return nil
+  end
+
 end

games/maze/spec/maze/map_spec.rb

@@ -1,19 +1,54 @@
 require File.dirname(__FILE__) + '/../spec_helper'
 
 describe Map do
+  let(:blueprint) {
+    "*****\n" +
+    "*...*\n" +
+    "*...*\n" +
+    "**F**"
+  }
+  let(:map) { Map.new(blueprint, [2,1], [1,3]) }
+
   it 'places players in their starting positions' do
-    blueprint = "*****\n" +
-                "*...*\n" +
-                "*...*\n" +
-                "**F**"
-    player1_start = [1,1]
-    player2_start = [1,3]
+    map.state.should == "*****\n" +
+                        "*..2*\n" +
+                        "*1..*\n" +
+                        "**F**"
+  end
 
-    map = Map.new(blueprint, player1_start, player2_start)
+  it 'allows a player to move east to a valid space' do
+    map.move('1', 'E')
+
+    map.state.should == "*****\n" +
+                        "*..2*\n" +
+                        "*.1.*\n" +
+                        "**F**"
+  end
+
+  it 'allows a player to move north to a valid space' do
+    map.move('1', 'N')
 
     map.state.should == "*****\n" +
                         "*1.2*\n" +
                         "*...*\n" +
                         "**F**"
   end
+
+  it 'allows a player to move south to a valid space' do
+    map.move('2', 'S')
+
+    map.state.should == "*****\n" +
+                        "*...*\n" +
+                        "*1.2*\n" +
+                        "**F**"
+  end
+
+  it 'allows a player to move west to a valid space' do
+    map.move('2', 'W')
+
+    map.state.should == "*****\n" +
+                        "*.2.*\n" +
+                        "*1..*\n" +
+                        "**F**"
+  end
 end