In one embodiment, a software module is validated according to requirements associated with the software module. The software module has numeric and string variables, and is associated with first numeric constrains and first string constraints. Second numeric constraints applying to specific numeric variables and second string constraints applying to specific string variables are inferred. Each numeric constraint is represented with an equation, and each string constraint is represented with a finite state machine. Attempt to solve a solution for the numeric and string variables that satisfies all the first and second numeric constraints, all the first and second string constraints, and all the requirements associated with the software module by iteratively testing different possible values for the numeric and string variables.