Added missing test case

tests/test_tsvector_type.py

@@ -0,0 +1,20 @@
+import sqlalchemy as sa
+from sqlalchemy_utils import TSVectorType
+from tests import TestCase
+
+
+class TestTSVector(TestCase):
+    def create_models(self):
+        class User(self.Base):
+            __tablename__ = 'user'
+            id = sa.Column(sa.Integer, primary_key=True)
+            name = sa.Column(sa.Unicode(255))
+            search_index = sa.Column(TSVectorType())
+
+            def __repr__(self):
+                return 'User(%r)' % self.id
+
+        self.User = User
+
+    def test_generates_table(self):
+        assert 'search_index' in self.User.__table__.c