mono/mcs/class/System.Data.OracleClient/README.tests

Some tests located in Test/System.Data.OracleClient require a connection to Oracle database to execute.
To configure a connection, copy System.Data.OracleClient_test_default.dll.config.example
to System.Data.OracleClient_test_default.dll.config and fill in the OracleConnectionString with appropriate values.

If no System.Data.OracleClient_test_default.dll.config is present, those tests will be ignored.