testIDEA can be used to create and configure target independent test cases, while test execution is controlled in winIDEA. Most settings can be configured in testIDEA with command File | Properties. These settings are stored in iyaml file. See also testIDEA and Project Configuration.
Low level configuration of isystem.test, which includes also target dependent settings, is accessible in winIDEA with command Test | isystem.test Options ... These settings are stored in winIDEA project (xjrf) file.
It is highly recommended to review these settings before running tests. Because some of them depend also on compiler flags, winIDEA can not always set correct defaults!