support unicode in EmailField

tests/fields/fields.py

@@ -342,8 +342,6 @@ class FieldTest(MongoDBTestCase):
         class Link(Document):
             url = URLField()
 
-        Link.drop_collection()
-
         link = Link()
         link.url = 'google'
         self.assertRaises(ValidationError, link.validate)
@@ -356,8 +354,6 @@ class FieldTest(MongoDBTestCase):
         class Link(Document):
             url = URLField()
 
-        Link.drop_collection()
-
         link = Link()
         link.url = u'http://привет.com'
 
@@ -3456,25 +3452,57 @@ class FieldTest(MongoDBTestCase):
         class User(Document):
             email = EmailField()
 
-        user = User(email="ross@example.com")
-        self.assertTrue(user.validate() is None)
+        user = User(email='ross@example.com')
+        user.validate()
 
-        user = User(email="ross@example.co.uk")
-        self.assertTrue(user.validate() is None)
+        user = User(email='ross@example.co.uk')
+        user.validate()
 
-        user = User(email=("Kofq@rhom0e4klgauOhpbpNdogawnyIKvQS0wk2mjqrgGQ5S"
-                           "aJIazqqWkm7.net"))
-        self.assertTrue(user.validate() is None)
+        user = User(email=('Kofq@rhom0e4klgauOhpbpNdogawnyIKvQS0wk2mjqrgGQ5S'
+                           'aJIazqqWkm7.net'))
+        user.validate()
 
-        user = User(email="new-tld@example.technology")
-        self.assertTrue(user.validate() is None)
+        user = User(email='new-tld@example.technology')
+        user.validate()
 
+        user = User(email='ross@example.com.')
+        self.assertRaises(ValidationError, user.validate)
+
+        # localhost should be whitelisted by default
         user = User(email='me@localhost')
+        user.validate()
+
+        # valid IPv4 domain
+        user = User(email='email@[127.0.0.1]')
+        user.validate()
+
+        # valid IPv6 domain
+        user = User(email='email@[2001:dB8::1]')
+        user.validate()
+
+        # invalid IP
+        user = User(email='email@[324.0.0.1]')
         self.assertRaises(ValidationError, user.validate)
 
-        user = User(email="ross@example.com.")
+        # unicode domain
+        user = User(email=u'user@пример.рф')
+        user.validate()
+
+        # invalid unicode domain
+        user = User(email=u'user@пример')
         self.assertRaises(ValidationError, user.validate)
 
+        # unicode user shouldn't validate by default...
+        user = User(email=u'Dörte@Sörensen.example.com')
+        self.assertRaises(ValidationError, user.validate)
+
+        # ...but it should be fine with allow_utf8_user set to True
+        class User(Document):
+            email = EmailField(allow_utf8_user=True)
+
+        user = User(email=u'Dörte@Sörensen.example.com')
+        user.validate()
+
     def test_email_field_honors_regex(self):
         class User(Document):
             email = EmailField(regex=r'\w+@example.com')