diff --git a/tests/fields/fields.py b/tests/fields/fields.py
index ffee25e6..4360f298 100644
--- a/tests/fields/fields.py
+++ b/tests/fields/fields.py
@@ -312,6 +312,27 @@ class FieldTest(MongoDBTestCase):
 
         self.assertEqual(1, TestDocument.objects(long_fld__ne=None).count())
 
+    def test_callable_validation(self):
+        """Ensure that callable validation works"""
+        def check_even(value):
+            return value % 2 == 0
+
+        class Order(Document):
+            number = IntField(validation=check_even)
+
+        Order.drop_collection()
+
+        order = Order(number=3)
+        self.assertRaises(ValidationError, order.validate)
+
+        class User(Document):
+            name = StringField(validation=1)
+
+        User.drop_collection()
+
+        user = User(name='test')
+        self.assertRaises(ValidationError, user.validate)
+
     def test_object_id_validation(self):
         """Ensure that invalid values cannot be assigned to an
         ObjectIdField.
@@ -334,7 +355,7 @@ class FieldTest(MongoDBTestCase):
     def test_string_validation(self):
         """Ensure that invalid values cannot be assigned to string fields."""
         class Person(Document):
-            name = StringField(max_length=20)
+            name = StringField(max_length=20, min_length=5)
             userid = StringField(r'[0-9a-z_]+$')
 
         person = Person(name=34)
@@ -352,6 +373,10 @@ class FieldTest(MongoDBTestCase):
         person = Person(name='Name that is more than twenty characters')
         self.assertRaises(ValidationError, person.validate)
 
+        # Test max length validation on name
+        person = Person(name='aa')
+        self.assertRaises(ValidationError, person.validate)
+
         person.name = 'Shorter name'
         person.validate()
 
@@ -437,6 +462,10 @@ class FieldTest(MongoDBTestCase):
         doc.age = 'ten'
         self.assertRaises(ValidationError, doc.validate)
 
+        # Test max_value validation
+        doc.value = 200
+        self.assertRaises(ValidationError, doc.validate)
+
     def test_float_validation(self):
         """Ensure that invalid values cannot be assigned to float fields.
         """
@@ -519,6 +548,11 @@ class FieldTest(MongoDBTestCase):
             class User(Document):
                 name = StringField(db_field='name\0')
 
+        # db field should be a string
+        with self.assertRaises(TypeError):
+            class User(Document):
+                name = StringField(db_field=1)
+
     def test_decimal_comparison(self):
         class Person(Document):
             money = DecimalField()
diff --git a/tests/queryset/geo.py b/tests/queryset/geo.py
index 38c0377e..acfd9364 100644
--- a/tests/queryset/geo.py
+++ b/tests/queryset/geo.py
@@ -429,6 +429,10 @@ class GeoQueriesTest(MongoDBTestCase):
         roads = Road.objects.filter(line__geo_within=polygon).count()
         self.assertEqual(1, roads)
 
+        sphere = [[-1, 42,], 2]
+        roads = Road.objects.filter(line__geo_within_sphere=sphere).count()
+        self.assertEqual(0, roads)
+
         roads = Road.objects.filter(line__geo_within={"$geometry": polygon}).count()
         self.assertEqual(1, roads)
 
diff --git a/tests/queryset/queryset.py b/tests/queryset/queryset.py
index 43800fff..984314ed 100644
--- a/tests/queryset/queryset.py
+++ b/tests/queryset/queryset.py
@@ -1861,6 +1861,10 @@ class QuerySetTest(unittest.TestCase):
         post = BlogPost(name="Test Post", hits=5, tags=['test'])
         post.save()
 
+        BlogPost.objects.update(hits=11)
+        post.reload()
+        self.assertEqual(post.hits, 11)
+
         BlogPost.objects.update(set__hits=10)
         post.reload()
         self.assertEqual(post.hits, 10)
@@ -1882,6 +1886,12 @@ class QuerySetTest(unittest.TestCase):
         post.reload()
         self.assertTrue('mongo' in post.tags)
 
+        # Push with arrays
+        BlogPost.objects.update(push__tags=['python', 'scala'])
+        post.reload()
+        self.assertTrue('python' in post.tags)
+        self.assertTrue('scala' in post.tags)
+
         BlogPost.objects.update_one(push_all__tags=['db', 'nosql'])
         post.reload()
         self.assertTrue('db' in post.tags and 'nosql' in post.tags)