tests: add test for trimming

tests/test_trim.py

@@ -0,0 +1,34 @@
+#!/usr/bin/python
+
+
+"""
+test for trimming under Python 3
+"""
+
+from __future__ import absolute_import, print_function
+import unittest
+import os
+import pkg_resources
+import sys
+from pymavlink import mavutil
+
+class PayLoadTrimZeros(unittest.TestCase):
+    '''Trivial test for trimming zeros from end of messages'''
+
+    def test_dump_length(self):
+        mavutil.mavlink.WIRE_PROTOCOL_VERSION = 2
+        mav = mavutil.mavudp(":12345")
+
+        ts = [ ((1, 1), 10),
+              ((1, 0), 9),
+              ((0, 0), 9)
+              ]
+        for t in ts:
+            ((sysid, compid), result) = t
+            m = mavutil.mavlink.MAVLink_param_request_list_message(sysid, compid)
+            packed = m.pack(mav.mav)
+            print("(%u/%u should be %u" % (sysid,compid, result))
+            self.assertEqual(len(packed), result)
+
+if __name__ == '__main__':
+    unittest.main()