Merge pull request #125 from OpenTrons/288-s-add-robot-comment

adds robot.comment for printing custom messages during protocol run

opentrons/robot/robot.py

@@ -478,6 +478,16 @@ def _do():
             log.info('Executing: Home now')
             return _do()
 
+    def comment(self, description):
+        def _do():
+            pass
+
+        def _setup():
+            pass
+
+        c = Command(do=_do, setup=_setup, description=description)
+        self.add_command(c)
+
     def add_command(self, command):
 
         if command.description:

tests/opentrons/protocol/test_robot.py

@@ -32,6 +32,12 @@ def test_add_container(self):
         }
         self.assertEquals(res, expected)
 
+    def test_comment(self):
+        self.robot.clear_commands()
+        self.robot.comment('hello')
+        self.assertEquals(len(self.robot.commands()), 1)
+        self.assertEquals(self.robot._commands[0].description, 'hello')
+
     def test_home_after_disconnect(self):
         self.robot.disconnect()
         self.assertRaises(RuntimeError, self.robot.home)