Particular embodiment compile a C++ program having one or more input variables to obtain bytecode of the C++ program; compile a C++ library to obtain bytecode of the C++ library; symbolically execute the bytecode of the C++ program and the bytecode of the C++ library, comprising assign a symbolic input to each input variable of the C++ program; determine one or more execution paths in the C++ program; and for each execution path, construct a symbolic expression that if satisfied, causes the C++ program to proceed down the execution path; and generate one or more test cases for the C++ program by solving the symbolic expressions.