Elaborate: add left/right movement

mars-rover/src/rover.py

@@ -25,16 +25,25 @@ def move_backward(self, delta):
         self.x -= delta[0]
         self.y -= delta[1]
 
+    def move_right(self, delta):
+        self.orientation = delta[3]
+
+    def move_left(self, delta):
+        self.orientation = delta[2]
+
     # commands to dispatch for each move key
     commands = {
         'f': move_forward,
-        'b': move_backward
+        'b': move_backward,
+        'r': move_right,
+        'l': move_left
     }
 
     # x,y deltas to move forward for each orientation
+    # compoents are dx, dy, leftOrientation, rightOrientation
     deltas = {
-        'N': [ +0, +1 ],
-        'S': [ +0, -1 ],
-        'E': [ +1, +0 ],
-        'W': [ -1, +0 ]
+        'N': [ +0, +1, 'W', 'E' ],
+        'S': [ +0, -1, 'E', 'W' ],
+        'E': [ +1, +0, 'N', 'S' ],
+        'W': [ -1, +0, 'S', 'N' ]
     }

mars-rover/test/test_rover.py

@@ -32,6 +32,14 @@ def test_move_b(self):
         assert_equal(10, r.x)
         assert_equal(20, r.y)
 
+    def test_move_right(self):
+        r.move(list('r'))
+        assert_equal('E', r.orientation)
+
+    def test_move_left(self):
+        r.move(list('l'));
+        assert_equals('W', r.orientation)
+
 class TestMovesOrientationSouth:
 
     def setup(self):
@@ -49,6 +57,14 @@ def test_move_backward(self):
         assert_equal(10, r.x)
         assert_equal(22, r.y)
 
+    def test_move_right(self):
+        r.move(list('r'))
+        assert_equal('W', r.orientation)
+
+    def test_move_left(self):
+        r.move(list('l'));
+        assert_equals('E', r.orientation)
+
 # would love use use test generators!
 class TestMovesOrientationEast:
 
@@ -66,6 +82,14 @@ def test_move_backward(self):
         assert_equal(9, r.x)
         assert_equal(21, r.y)
 
+    def test_move_right(self):
+        r.move(list('r'))
+        assert_equal('S', r.orientation)
+
+    def test_move_left(self):
+        r.move(list('l'));
+        assert_equals('N', r.orientation)
+
 class TestMovesOrientationWest:
 
     def setup(self):
@@ -81,3 +105,11 @@ def test_move_backward(self):
         r.move(list("b"))
         assert_equal(11, r.x)
         assert_equal(21, r.y)
+
+    def test_move_right(self):
+        r.move(list('r'))
+        assert_equal('N', r.orientation)
+
+    def test_move_left(self):
+        r.move(list('l'));
+        assert_equals('S', r.orientation)