// single-header unit test framework.
// if you want to keep your sanity, do not use this.

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

// globals.
int tests_passed = 0;
char *current_label;
int current_num;

/* Basic idea:

TEST("...", {
    ASSERT(...)
    ASSERT(...)
    ...
})


TEST("...", {
    ASSERT(...)
    ASSERT(...)
    ...
})

DONE

*/

#define TEST(LABEL, BLOCK) \
current_label = LABEL; \
current_num = __COUNTER__ + 1; \
BLOCK; \
fprintf(stderr, "[%3d] \x1b[32m%s ✓\x1b[0m\n", current_num, current_label); \
tests_passed++;

#define ASSERT(EXPR) \
if (!(EXPR)) { \
  fprintf(stderr, "[%3d] \x1b[31m%s ❌\x1b[0m\n", current_num, current_label); \
  fprintf(stderr, "       Assertion failed in %s:%d:\n", __FILE__, __LINE__); \
  fprintf(stderr, "       " #EXPR "\n"); \
  goto after_tests; \
}

#define DONE \
after_tests: { \
  int tests_total = __COUNTER__; \
  fprintf(stderr, "[\x1b[%dm***\x1b[0m] %d/%d tests passed.\n", tests_passed == tests_total ? 32 : 31, tests_passed, tests_total); \
  if (tests_passed != tests_total) exit(1); \
}