Raise cx_Oracle minimum version to 5.2

The minimum cx_Oracle version supported is 5.2 (June 2015).  Previously,
the dialect asserted against version 5.0 but as of 1.2.2 we are using some
symbols that did not appear until 5.2.

Change-Id: I6fa4238f1722789924f4a6473fdce6f524333825
Fixes: #4211

1 files changed, 18 insertions, 1 deletions

diff --git a/test/dialect/oracle/test_dialect.py b/test/dialect/oracle/test_dialect.py
index 83a875c2e..fc6eba89a 100644
--- a/test/dialect/oracle/test_dialect.py
+++ b/test/dialect/oracle/test_dialect.py
@@ -28,7 +28,8 @@ import datetime
 import os
 from sqlalchemy import sql
 from sqlalchemy.testing.mock import Mock
-
+from sqlalchemy.testing import mock
+from sqlalchemy import exc
 
 class DialectTest(fixtures.TestBase):
     def test_cx_oracle_version_parse(self):
@@ -49,6 +50,22 @@ class DialectTest(fixtures.TestBase):
             (6, 0)
         )
 
+    def test_minimum_version(self):
+        with mock.patch(
+                "sqlalchemy.dialects.oracle.cx_oracle.OracleDialect_cx_oracle."
+                "_parse_cx_oracle_ver", lambda self, vers: (5, 1, 5)):
+            assert_raises_message(
+                exc.InvalidRequestError,
+                "cx_Oracle version 5.2 and above are supported",
+                cx_oracle.OracleDialect_cx_oracle,
+                dbapi=Mock()
+            )
+
+        with mock.patch(
+                "sqlalchemy.dialects.oracle.cx_oracle.OracleDialect_cx_oracle."
+                "_parse_cx_oracle_ver", lambda self, vers: (5, 3, 1)):
+            cx_oracle.OracleDialect_cx_oracle(dbapi=Mock())
+
 
 class OutParamTest(fixtures.TestBase, AssertsExecutionResults):
     __only_on__ = 'oracle+cx_oracle'