add tests

tests/test_octodns_provider_base.py

@@ -214,9 +214,11 @@ class TestBaseProvider(TestCase):
                    for i in range(int(Plan.MIN_EXISTING_RECORDS *
                                       Plan.MAX_SAFE_UPDATE_PCENT) + 1)]
 
-        with self.assertRaises(UnsafePlan):
+        with self.assertRaises(UnsafePlan) as ctx:
             Plan(zone, zone, changes).raise_if_unsafe()
 
+        self.assertTrue('Too many updates' in ctx.exception.message)
+
     def test_safe_updates_min_existing_pcent(self):
         # MAX_SAFE_UPDATE_PCENT is safe when more
         # than MIN_EXISTING_RECORDS exist
@@ -260,9 +262,11 @@ class TestBaseProvider(TestCase):
                    for i in range(int(Plan.MIN_EXISTING_RECORDS *
                                       Plan.MAX_SAFE_DELETE_PCENT) + 1)]
 
-        with self.assertRaises(UnsafePlan):
+        with self.assertRaises(UnsafePlan) as ctx:
             Plan(zone, zone, changes).raise_if_unsafe()
 
+        self.assertTrue('Too many deletes' in ctx.exception.message)
+
     def test_safe_deletes_min_existing_pcent(self):
         # MAX_SAFE_DELETE_PCENT is safe when more
         # than MIN_EXISTING_RECORDS exist