Fix: failing unittest connection.WL14263 unable to load ldap plugin

Test connection.WL14263.test_authentication_ldap_sasl_client must
be skipped if authentication_ldap_sasl does not support SCRAM-SHA-256.

Author: isrgomez

tests/__init__.py

@@ -996,6 +996,7 @@ def is_plugin_available(plugin_name, config_vars=None, in_server=None):
     server = in_server if in_server else MYSQL_SERVERS[0]
     plugin_config_vars = config_vars if config_vars else []
     server_cnf = server._cnf
+    server_cnf_bkp = server._cnf
     config = get_mysql_config(server.name)
 
     ext = "dll" if os.name == "nt" else "so"
@@ -1029,14 +1030,14 @@ def is_plugin_available(plugin_name, config_vars=None, in_server=None):
         cnx.close()
         return available
     except:
-        pass
+        LOGGER.warning("# Unable to load plugin '{}'.".format(plugin_name))
     finally:
         server.stop()
         server.wait_down()
-        server.start(my_cnf=server_cnf)
+        server.start(my_cnf=server_cnf_bkp)
         server.wait_up()
         sleep(1)
-    return available
+        return available
 
 def check_tls_versions_support(tls_versions):
     """Check whether we can connect with given TLS version

tests/test_connection.py

@@ -2837,12 +2837,14 @@ def test_clear_text_pass(self):
         self.assertRaises(InterfaceError, self.cnx.__class__, **conn_args)
 
 
-@unittest.skipIf(tests.MYSQL_VERSION < (5, 7),
+plugin_opts = (("authentication_ldap_sasl_auth_method_name", "SCRAM-SHA-256"),)
+@unittest.skipIf(tests.MYSQL_VERSION < (8, 2, 22),
                  "Authentication with ldap_simple not supported")
 #Skip if remote ldap server is not reachable.
 @unittest.skipIf(not tests.is_host_reachable("100.103.19.5"),
                  "ldap server is not reachable")
-@unittest.skipIf(not tests.is_plugin_available("authentication_ldap_sasl"),
+@unittest.skipIf(not tests.is_plugin_available("authentication_ldap_sasl",
+                                               plugin_opts),
                  "Plugin authentication_ldap_simple not available")
 class WL14263(tests.MySQLConnectorTests):
     """WL#14110: Add support for SCRAM-SHA-256