When the Mars rover is at the bottom edge, moving forward makes it

reappear at the top edge.
simplybusiness · Oct 25, 2023 · 0e5e80f · 0e5e80f
1 parent 61a6fd8
commit 0e5e80f
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Showing 2 changed files with 13 additions and 2 deletions.
diff --git a/lib/map.rb b/lib/map.rb
@@ -23,7 +23,11 @@ def next_coordinate_forwards(current_position:, direction:)
         Coordinates.new(x: current_position.x + 1, y: current_position.y)
       end
     when 'S'
-      Coordinates.new(x: current_position.x, y: current_position.y - 1)
+      if current_position.y == @bottom_edge
+        Coordinates.new(x: current_position.x, y: @top_edge)
+      else
+        Coordinates.new(x: current_position.x, y: current_position.y - 1)
+      end
     when 'W'
       if at_left_hand_edge?(current_position)
         Coordinates.new(x: @right_hand_edge, y: current_position.y)

diff --git a/spec/moving_forwards_spec.rb b/spec/moving_forwards_spec.rb
@@ -132,6 +132,13 @@
       expect(mars_rover).to be_located_at(bottom_edge)
     end
 
-    it 'can move from the bottom edge of the planet and reappear at the top edge'
+    it 'can move from the bottom edge of the planet and reappear at the top edge' do
+      mars_rover = MarsRover.new(map: Map.new, starting_position: Coordinates.new(x: 5, y: 0), direction: 'S')
+
+      mars_rover.execute(['f'])
+
+      bottom_edge = Coordinates.new(x: 5, y: 10)
+      expect(mars_rover).to be_located_at(bottom_edge)
+    end
   end
 end