question: private void validateTableMetaDataSingleRow ( String tableNamePattern , String [ ] types , Map < TableMetaData , Object > validationRules ) throws Exception { checkValidationRulesComplete ( validationRules ) ; try ( ResultSet tables = dbmd . getTables ( null , null , tableNamePattern , types ) ) { assertTrue ( "Expected row in table metadata" , tables . next ( ) ) ; validateRowValues ( tables , validationRules ) ; assertFalse ( "Expected only one row in result set" , tables . next ( ) ) ; } }
target:  Helper method for test methods that retrieve a single metadata row.