diff --git a/trtests.py b/trtests.py
index 4fee01c..53ed6a2 100644
--- a/trtests.py
+++ b/trtests.py
@@ -115,6 +115,14 @@ class ToyRobotTests(unittest.TestCase):
         self.assertTrue(robot.get_position() == (0, 1))
 
     def test_rotate_left(self):
+        robot = toyrobot.Robot()
+        robot.place(0, 0, "SOUTH")
+        robot.rotate_left()
+        self.assertTrue(robot.get_direction() == "EAST")
+
+    def test_rotate_left_2(self):
+        # Blackbox test - ensures internal numerical direction using modulus
+        # correctly on decrement.
         robot = toyrobot.Robot()
         robot.place(0, 0, "NORTH")
         robot.rotate_left()
@@ -128,11 +136,33 @@ class ToyRobotTests(unittest.TestCase):
 
     def test_rotate_right_2(self):
         # Blackbox test - ensures internal numerical direction using modulus
-        # correctly.
+        # correctly on increment.
         robot = toyrobot.Robot()
         robot.place(0, 0, "WEST")
         robot.rotate_right()
         self.assertTrue(robot.get_direction() == "NORTH")
 
+    def test_example_d_calls(self):
+        robot = toyrobot.Robot()
+        robot.place(1, 2, "EAST")
+        robot.move()
+        robot.rotate_left()
+        robot.move()
+        robot.place(3, 1)
+        robot.move()
+        self.assertTrue(robot.is_initialized() and \
+            robot.get_position() == (3, 2) and \
+            robot.get_direction() == "NORTH")
+
+    def test_example_d_commands(self):
+        robot = toyrobot.Robot()
+        robot.interpret_command("PLACE 1,2,EAST")
+        robot.interpret_command("MOVE")
+        robot.interpret_command("LEFT")
+        robot.interpret_command("MOVE")
+        robot.interpret_command("PLACE 3,1")
+        robot.interpret_command("MOVE")
+        self.assertTrue(str(robot) == "3,2,NORTH")
+
 if __name__ == '__main__':
     unittest.main()