Use ``;`` instead of ``select 1`` to ping PostgreSQL

Fixes: #8491
Change-Id: I941d2a3cf92e5609e2045a53cec94522340951db

1 files changed, 11 insertions, 0 deletions

diff --git a/lib/sqlalchemy/testing/suite/test_dialect.py b/lib/sqlalchemy/testing/suite/test_dialect.py
index 55276e21b..bb2dd6574 100644
--- a/lib/sqlalchemy/testing/suite/test_dialect.py
+++ b/lib/sqlalchemy/testing/suite/test_dialect.py
@@ -8,6 +8,7 @@ from .. import config
 from .. import engines
 from .. import eq_
 from .. import fixtures
+from .. import is_true
 from .. import ne_
 from .. import provide_metadata
 from ..assertions import expect_raises_message
@@ -24,6 +25,16 @@ from ... import select
 from ... import String
 
 
+class PingTest(fixtures.TestBase):
+    __backend__ = True
+
+    def test_do_ping(self):
+        with testing.db.connect() as conn:
+            is_true(
+                testing.db.dialect.do_ping(conn.connection.dbapi_connection)
+            )
+
+
 class ExceptionTest(fixtures.TablesTest):
     """Test basic exception wrapping.