Add exception check.

Author: zancas

f5/bigip/resource.py

@@ -1039,4 +1039,15 @@ def load(self, **kwargs):
 
 
 class Stats(UnnamedResource):
+    '''For stats resources.'''
+
+    def modify(self, **kwargs):
+        '''Modify is not supported for unnamed resources
+
+        :raises: UnsupportedOperation
+        '''
+        raise UnsupportedMethod(
+            "%s does not support the modify method" % self.__class__.__name__
+        )
+
     pass

test/functional/tm/ltm/test_virtual.py

@@ -17,6 +17,7 @@
 
 from f5.bigip.resource import MissingRequiredCreationParameter
 from f5.bigip.resource import MissingRequiredReadParameter
+from f5.sdk_exception import UnsupportedMethod
 
 import copy
 from pprint import pprint as pp
@@ -81,7 +82,17 @@ def test_stats(self, request, mgmt_root, setup_device_snapshot):
         virtual1, vc1 = setup_virtual_test(
             request, mgmt_root, 'Common', 'modtest1'
         )
-
+        stats = virtual1.stats.load()
+        assert virtual1.cmpEnabled == u'yes'
+        assert stats.entries['cmpEnabled']['description'] == u'enabled'
+        virtual1.modify(cmpEnabled=u'no')
+        stats.refresh()
+        assert stats.entries['cmpEnabled']['description'] == u'disabled'
+        with pytest.raises(UnsupportedMethod) as USMEIO:
+            stats.modify(description='foo')
+        assert USMEIO.value.message ==\
+            "Stats does not support the modify method"
+        
 
 def test_profiles_CE(
         mgmt_root, opt_release, setup_device_snapshot