Implementing test cases
GNUstep now has a test framework included as part of the gnustep-make package. It has no external dependencies other than the tools needed to build GNUstep itself ... so if you can build code you are guaranteed to be able to produce tests for it.
Similarly, if you install gnustep-make on an Apple OSX system, you can run test cases there against the Apple implementation of the code ... this is great for ensuring that GNUstep implementation of common APIs not only behaves s documented, but also matches the details of Apple's implemented behaviours.
You execute test cases using the gnustep-tests command.
Try 'gnustep-tests --help' to list the available options.
Try 'gnustep-tests --documentation' for full documentation on how to run tests.
Look in $GNUSTEP_MAKEFILES/TestFramework for examples of how to use the framework.
For gnustep-base test cases, look in the Tests/base subdirectory in the gnustep-base package
For gnustep-gui test cases, look in the Tests/gui subdirectory in the gnustep-gui package