add test case for when the server returns tooBig.. make sure we

subdivide the query into smaller chunks..   perfect example of how
the pysnmp hlapi isn't that high level...

vlanmang.py

@@ -555,6 +555,32 @@ class _TestSNMPSwitch(unittest.TestCase):
 		# and call _getmany w/ the correct arg
 		gm.assert_called_with(arg)
 
+	@mock.patch('pysnmp.hlapi.ContextData')
+	@mock.patch('vlanmang.getCmd')
+	def test_getmany(self, gc, cd):
+		# that a switch
+		switch = SNMPSwitch(None, None)
+
+		# when getCmd returns tooBig when too many oids are asked for
+		def custgetcmd(eng, cd, targ, contextdata, *oids):
+			# induce a too big error
+			if len(oids) > 3:
+				res = ( None, 'tooBig', None, None )
+			else:
+				#import pdb; pdb.set_trace()
+				[ oid.resolveWithMib(_mvc) for oid in oids ]
+				res = ( None, None, None, oids )
+
+			return iter([res])
+
+		gc.side_effect = custgetcmd
+
+		#import pdb; pdb.set_trace()
+		res = switch.getegress(*xrange(1, 10))
+
+		# will still return the complete set of results
+		self.assertEqual(res, { x: '' for x in xrange(1, 10) })
+
 _skipSwitchTests = True
 
 class _TestSwitch(unittest.TestCase):