main.c

#include <stdio.h>
#include "test.h"

int register_parse_tests();

int main(int argc, char*argv[]) 
{
    int r = 0;

    r = register_parse_tests();
    if (r < 0) 
    {
        printf("Registering parse tests failed.\n");
        return -1;
    }

    return tst_run();
}

parse_tests.c

/* example usage from ezscript */

#include "test.h"
#include "ezscript.h"

int test_empty() 
{  
    char* code = "";
    
    int r = ez_compile(code);
    
    return r == EZ_OK;
}

int test_variable() 
{
    char* code = "var a = 1;";
    
    int r = ez_compile(code);
    
    return r == EZ_OK;
}

int register_parse_tests()
{
    TST_REGISTER(test_empty);
    TST_REGISTER(test_variable);
    
    return 0;
}

test.c

#include <assert.h>
#include <stdlib.h> 
#include <stdio.h>
#include "test.h"

typedef struct Test {
  const char*  name;
  test_fun     fun;
  struct Test* next;
} Test;

Test* test_root = NULL;

int tst_register(const char* name, test_fun fun)
{
  Test* test = malloc(sizeof(Test));
  if (test == NULL)
  {
    printf("Failed to alocate structures for %s.\n", name);
    // this will probably do nothing sensible, because this code is executed premain
    return -1; 
  }
  
  test->name = name; // safe if used with TEST macro
  test->fun  = fun;
  test->next = NULL;
  
  if (test_root == NULL) {
    test_root = test;
  }
  else
  {
    Test* tmp = test_root;
    while (tmp->next != NULL) 
    {
      tmp = tmp->next;
    }
    tmp->next = test;
  }
  
  return 0;
}

int tst_run() 
{
  int success = 0;
  int fail    = 0;
  int sum;
  
  Test* tmp = test_root;
  while (tmp != NULL) 
  {
    int r = tmp->fun();
    if (r) 
    {
      success++;
    }
    else
    {
      fail++;
      printf("Test %s failed.\n", tmp->name);
    }
    
    tmp = tmp->next;
  }
  
  sum = success + fail;
  printf("Ran %d tests: %d success %d fail\n", sum, success, fail);
  
  return 0;
}

test.h

#include <stdio.h>

typedef int (*test_fun)();

int tst_register(const char* name, test_fun fun);
int tst_run();

#define TST_REGISTER(NAME) \
    int result ## NAME = tst_register(#NAME, NAME); \
    if (result ## NAME < 0) \
    { \
        printf("Failed to register %s test.", #NAME); \
        return result ## NAME; \
    }