Provides the success rate as the result of conducting a test. Only
implemented method is for objects of class "test.result"
Calculates the success rate from the number of successful tests conducted as a function of the number of function evaluations used.
signature(object = "test.result")
This method is used internally by the graphical functions. Returns a list with components:
The number of function evaluations.
The corresponding success rate (between 0 and 1).