#define STR STR1 #define STR1 "this is a test!" #define STR2 "This is a test!" #define STR3 "This is A tEst!" void do_tests() { string str; str = STR1; ASSERT(lower_case(str) == STR); ASSERT(str == STR1); str = STR2; ASSERT(lower_case(str) == STR); ASSERT(str == STR2); str = STR3; ASSERT(lower_case(str) == STR); ASSERT(str == STR3); }