Fix help_cd() to not raise an exception

CHANGES.txt

@@ -1,5 +1,8 @@
 0.12-dev *Next Release*
 
+  - Fixed a bug that caused ``help cd`` to raise an exception
+    in the monitor.
+
 0.11 (2012-01-07)
 
   - Added a new 65Org16 MPU simulation written by Ed Spittles.

src/py65/monitor.py

@@ -452,7 +452,7 @@ class Monitor(cmd.Cmd):
                 except KeyError, why:
                     self._output(why[0])
 
-    def help_cd(self, args):
+    def help_cd(self):
         self._output("cd <directory>")
         self._output("Change the working directory.")
 

src/py65/tests/test_monitor.py

@@ -139,6 +139,16 @@ class MonitorTests(unittest.TestCase):
         out = stdout.getvalue()
         self.assertTrue(out.startswith("assemble <address>"))
 
+    # cd
+
+    def test_help_cd(self):
+        stdout = StringIO()
+        mon = Monitor(stdout=stdout)
+        mon.help_cd()
+
+        out = stdout.getvalue()
+        self.assertTrue(out.startswith("cd <directory>"))
+
     # delete_label
 
     def test_shortcut_for_delete_label(self):