start moving the rover forward.

2 files changed, 12 insertions, 0 deletions

diff --git a/lib/rover.rb b/lib/rover.rb
index f5bfa7d..127bd41 100644
--- a/lib/rover.rb
+++ b/lib/rover.rb
@@ -11,6 +11,9 @@ class Rover
   def turn_left
     @heading = @heading.turn_left
   end
+  def move_forward(terrain)
+    terrain.move_to(0,0)
+  end
 end
 
 class North
diff --git a/spec/rover_specs.rb b/spec/rover_specs.rb
index 1af2993..09b14ce 100644
--- a/spec/rover_specs.rb
+++ b/spec/rover_specs.rb
@@ -21,6 +21,15 @@ describe Rover do
         @sut.heading.must_equal :west
       end
     end
+    describe "when driving forward" do
+      before do
+        @terrain = fake
+        @sut.move_forward(@terrain)
+      end
+      it "should increment the y coordinate on the terrain" do
+        @terrain.received(:move_to).called_with(0,1).wont_match nil
+      end
+    end
   end
 
   describe "when facing south" do