Add a test for the unicode handling in unknown types.

tests/test_pgexecute.py

@@ -1,7 +1,9 @@
 # coding=UTF-8
 
+import pytest
+import psycopg2
 from textwrap import dedent
-from utils import *
+from utils import run, dbtest
 
 @dbtest
 def test_conn(executor):
@@ -91,3 +93,7 @@ def test_bytea_field_support_in_output(executor):
         "insert into binarydata (c) values (decode('DEADBEEF', 'hex'))")
 
     assert u'\\xdeadbeef' in run(executor, "select * from binarydata", join=True)
+
+@dbtest
+def test_unicode_support_in_unknown_type(executor):
+    assert u'日本語' in run(executor, "SELECT '日本語' AS japanese;", join=True)