given:
        sourceFile << """
            #define HEADER_3 "hello.h"
            #define FUNC(X, Y) X
            #define CONCAT_(X, Y) X ## Y
            #define CONCAT(X, Y) CONCAT_(X, Y)
            #define ARGS (HEADER_ ## 3, ~)
            #include CONCAT(FUNC, ARGS)
        """

        expect:
        resolve() == [header]
    }