Function tf_dim

tests/test_framework.h:49–51

    return isatty(1) ? "\033[31m" : "";
}
static inline const char *tf_dim(void) {
    return isatty(1) ? "\033[90m" : "";
}
static inline const char *tf_reset(void) {
    return isatty(1) ? "\033[0m" : "";
}