You use this procedure to test new function modules before releasing them or to examine function modules written by other developers before using these modules in your programs.
The Test Function Module: Initial Screen appears. It displays all of the import and changing parameters of the function module.
The system runs the function module using your input and displays the values of the export parameters.
When you test a function module, the system displays all exceptions. It also calculates the time required to execute the module in microseconds.
Other Test Options
You can also run a test in the ABAP Debugger or create a runtime analysis performance file for a function.
To examine a function module in debugging mode:
The system executes the function module in debugging mode. You can step through the code and use all options offered in the ABAP Debugger
To test the performance of a function module:
The system executes the function module and records the performance function in a performance data file.