diff --git a/test/test_struct.py b/test/test_struct.py
index ad6fbee..51533d7 100644
--- a/test/test_struct.py
+++ b/test/test_struct.py
@@ -24,20 +24,23 @@ def test_which_builder(addressbook):
     alice = people[0]
     alice.employment.school = "MIT"
 
-    assert alice.employment.which() == "school"
+    assert alice.employment.which == addressbook.Person.Employment.school
+    assert alice.employment.which == "school"
 
     bob = people[1]
 
-    assert bob.employment.which() == "unemployed"
+    assert bob.employment.which == addressbook.Person.Employment.unemployed
+    assert bob.employment.which == "unemployed"
 
     bob.employment.unemployed = None
 
-    assert bob.employment.which() == "unemployed"
+    assert bob.employment.which == addressbook.Person.Employment.unemployed
+    assert bob.employment.which == "unemployed"
 
     with pytest.raises(ValueError):
-        addresses.which()
+        addresses.which
     with pytest.raises(ValueError):
-        addresses.which()
+        addresses.which
 
 
 def test_which_reader(addressbook):
@@ -63,15 +66,33 @@ def test_which_reader(addressbook):
     people = addresses.people
 
     alice = people[0]
-    assert alice.employment.which() == "school"
+    assert alice.employment.which == "school"
 
     bob = people[1]
-    assert bob.employment.which() == "unemployed"
+    assert bob.employment.which == "unemployed"
 
     with pytest.raises(ValueError):
-        addresses.which()
+        addresses.which
     with pytest.raises(ValueError):
-        addresses.which()
+        addresses.which
+
+
+def test_enum(addressbook):
+    addresses = addressbook.AddressBook.new_message()
+    people = addresses.init('people', 2)
+
+    alice = people[0]
+    phones = alice.init('phones', 2)
+
+    assert phones[0].type == phones[1].type
+
+    phones[0].type = addressbook.Person.PhoneNumber.Type.home
+
+    assert phones[0].type != phones[1].type
+
+    phones[1].type = 'home'
+
+    assert phones[0].type == phones[1].type
 
 
 def test_builder_set(addressbook):