I have rolled this simple unit test library for C:

com_github_coderodde_my_assert.h:

#ifndef COM_GITHUB_CODERODDE_MY_ASSERT_H#define COM_GITHUB_CODERODDE_MY_ASSERT_H#include <stdbool.h>#include <stdio.h>extern size_t passes;extern size_t failed;void print_test_statistics();#define ASSERT_IMPL(COND, LINE) assert_impl(COND, #COND, __LINE__);#define ASSERT(COND) ASSERT_IMPL(COND, __LINE__)#endif

com_github_coderodde_my_assert.c:

#include "com_github_coderodde_my_assert.h"#include <stdlib.h>static size_t passes = 0;static size_t failed = 0;void assert_impl(bool passed,                        const char* condition_text,                        size_t line_number) {    if (passed) {        passes++;    } else {        failed++;        printf("Failed condition \"%s\" at line %zu.\n",            condition_text,            line_number);    }}static void print_bar(size_t passes, size_t failed) {    size_t total_assertions = passes + failed;    char bar[81];    bar[0] = '[';    bar[79] = ']';    bar[80] = '\0';    float ratio = (float)(passes) / (float)(total_assertions);    size_t hash_symbols = (size_t)(78 * ratio);    for (size_t i = 0; i < hash_symbols; i++) {        bar[i + 1] = '#';    }    for (size_t i = 0; i < 78 - hash_symbols; i++) {        bar[i + 1 + hash_symbols] = '';    }    if (failed != 0) {        printf("\033[0;31m");        printf("%s: %.2f%%.\n", bar, 100.0f * ratio);    } else {        printf("\033[0;32m");        printf("%s: %.2F%%.\n", bar, 100.0f * ratio);    }    printf("\033[0m");}void print_test_statistics() {    printf("Passes: %zu, failures: %zu, total assertions: %zu.\n",           passes,           failed,           passes + failed);    print_bar(passes, failed);}

main.c:

#include "com_github_coderodde_my_assert.h"#include <stdbool.h>int main() {    ASSERT(true);    ASSERT(false);    ASSERT(1 + 1 == 3);    print_test_statistics();    return 0;}

Critique request

As always, I would love to hear any comments on how to improve my result.