Function tf_red

tests/test_framework.h:46–48

    return isatty(1) ? "\033[32m" : "";
}
static inline const char *tf_red(void) {
    return isatty(1) ? "\033[31m" : "";
}
static inline const char *tf_dim(void) {
    return isatty(1) ? "\033[90m" : "";
}