Single header C test framework

etest.h

#ifndef _E_TEST_H_
#define _E_TEST_H_

#include <stdint.h>
#include <stdio.h>

#define TEST(suite, name)                                                      \
  if (_etest_is_test_included_in_run(#suite, #name, test_context)) {           \
    _etest_register_running_test(#suite, #name, test_context);                 \
  }                                                                            \
  if (_etest_is_test_included_in_run(#suite, #name, test_context))

#define ASSERT(assertion, message)                                             \
  _etest_assert(assertion, message, __FILE__, __LINE__, test_context)

typedef struct {
  uint32_t tests_run;
  uint32_t test_failures;
} etest_context_t;

etest_context_t etest_create_context(void) {
  etest_context_t test_context = {.tests_run = 0u, .test_failures = 0u};

  return test_context;
}

void etest_report(const etest_context_t *test_context) {
  printf(
      "%d Tests, %d Failures\n",
      test_context->tests_run,
      test_context->test_failures);
}

uint8_t _etest_is_test_included_in_run(
    const char const *suite,
    const char const *name,
    etest_context_t * test_context) {
  return (uint8_t)1u;
}

void _etest_register_running_test(
    const char const *suite,
    const char const *name,
    etest_context_t * test_context) {
  printf("[%s] %s\n", suite, name);
  test_context->tests_run++;
}

void _etest_assert(
    const int32_t     assertion,
    const char const *message,
    const char const *file,
    const int32_t     line,
    etest_context_t * test_context) {
  if (!assertion) {
    printf("Assertion failed in %s line %d: \"%s\"\n", file, line, message);
    test_context->test_failures++;
  }
}

#endif // _E_TEST_H_

example_test.c

#include "etest.h"

void test_suite(etest_context_t *test_context) {

  TEST(DemoSuite, PassingTrivial) { 
    ASSERT(1, "1 is always true"); 
  }

  TEST(DemoSuite, FailingTrivial) { 
    ASSERT(0, "0 is always false"); 
  }
  
}

int main(int argc, char *argv[]) {
  etest_context_t test_context = etest_create_context();

  test_suite(&test_context);

  etest_report(&test_context);

  return 0;
}

output

$ gcc -O2 -g -o example_test example_test.c
$ ./example_test
[DemoSuite] PassingTrivial
[DemoSuite] FailingTrivial
Assertion failed in test/test_suite.c line 11: "0 is always false"
2 Tests, 1 Failures