Fix typo (missing space) in exception message (redis#1334)

Author: jdufresne

redis/connection.py

@@ -1039,7 +1039,7 @@ def from_url(cls, url, db=None, decode_components=False, **kwargs):
                 url_options['connection_class'] = SSLConnection
         else:
             valid_schemes = ', '.join(('redis://', 'rediss://', 'unix://'))
-            raise ValueError('Redis URL must specify one of the following'
+            raise ValueError('Redis URL must specify one of the following '
                              'schemes (%s)' % valid_schemes)
 
         # last shot at the db value

tests/test_connection_pool.py

@@ -393,8 +393,12 @@ def test_client_creates_connection_pool(self):
         }
 
     def test_invalid_scheme_raises_error(self):
-        with pytest.raises(ValueError):
+        with pytest.raises(ValueError) as cm:
             redis.ConnectionPool.from_url('localhost')
+        assert str(cm.value) == (
+            'Redis URL must specify one of the following schemes '
+            '(redis://, rediss://, unix://)'
+        )
 
 
 class TestConnectionPoolUnixSocketURLParsing(object):