From 08389a6d306570fc4575988e62a8397a5ff49bee Mon Sep 17 00:00:00 2001
From: Mosder <xmosder12@gmail.com>
Date: Fri, 31 Jul 2026 18:51:21 +0200
Subject: feat: created tester

---
 src/tester.c | 191 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 191 insertions(+)

(limited to 'src')

diff --git a/src/tester.c b/src/tester.c
index e69de29..361cfb9 100644
--- a/src/tester.c
+++ b/src/tester.c
@@ -0,0 +1,191 @@
+#include "moslib/tester.h"
+
+#include <setjmp.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "moslib/mem/alloc.h"
+
+#define INIT_GROUP_CAP 8
+#define INIT_TEST_CAP 16
+
+#define RED 91
+#define GREEN 92
+#define WHITE 97
+
+#define RENDER_WIDTH 80
+
+int failed = 0;
+
+#define print_color(template, ...) printf("\033[%dm" template "\033[0m", __VA_ARGS__)
+#define nl printf("\n")
+
+void print_center(const char *text, int color, char padding_char) {
+    size_t post_char_count = (RENDER_WIDTH - strlen(text)) / 2;
+    size_t pre_char_count = RENDER_WIDTH - post_char_count - strlen(text);
+
+    for (size_t i = 1; i < pre_char_count; i++)
+        printf("%c", padding_char);
+
+    print_color(" %s ", color, text);
+
+    for (size_t i = 1; i < post_char_count; i++)
+        printf("%c", padding_char);
+
+    nl;
+}
+
+typedef struct {
+    TestFn test;
+    const char *name;
+} TestName;
+
+struct Tester {
+    TestGroup *groups;
+    size_t n_groups;
+    size_t group_cap;
+};
+
+struct TestGroup {
+    const char *name;
+    TestName *tests;
+    size_t n_tests;
+    size_t test_cap;
+};
+
+Tester *new_tester() {
+    Tester *tester = safe_malloc(sizeof(Tester));
+    *tester = (Tester){
+        .groups = safe_malloc(INIT_GROUP_CAP * sizeof(TestGroup)),
+        .n_groups = 0,
+        .group_cap = INIT_GROUP_CAP,
+    };
+    return tester;
+}
+
+TestGroup *add_test_group_fn(Tester *tester, const char *group_name) {
+    if (tester->n_groups >= tester->group_cap) {
+        tester->group_cap *= 2;
+        tester->groups = safe_realloc(tester->groups, tester->group_cap * sizeof(TestGroup));
+    }
+
+    TestGroup *group = tester->groups + tester->n_groups++;
+    // clang-format off
+    *group = (TestGroup){
+        .name = group_name,
+        .tests = safe_malloc(INIT_TEST_CAP * sizeof(TestName)),
+        .n_tests = 0,
+        .test_cap = INIT_TEST_CAP
+    };
+    // clang-format on
+    return group;
+}
+
+void test_assert(int expression, const char *fail_message) {
+    if (!expression) {
+        failed = 1;
+        print_color("ASSERT FAILED: ", RED);
+        printf("%s\n", fail_message);
+    }
+}
+
+jmp_buf jump_env;
+int expected_code;
+const char *fn_name;
+void exit(int code) {
+    if (code != expected_code) {
+        failed = 1;
+        print_color("ASSERT FAILED: ", RED);
+        printf("exit code was %d, expected %d (in function %s)\n", code, expected_code, fn_name);
+    }
+    longjmp(jump_env, 1);
+}
+
+void test_assert_exit_fn(TestFn function, int code, const char *name) {
+    expected_code = code;
+    fn_name = name;
+    if (setjmp(jump_env) == 0) {
+        function();
+        failed = 1;
+        print_color("ASSERT FAILED: ", RED);
+        printf("exit was not called (in function %s)\n", name);
+    }
+}
+
+void add_test_fn(TestGroup *group, TestFn test, const char *name) {
+    if (group->n_tests >= group->test_cap) {
+        group->test_cap *= 2;
+        group->tests = safe_realloc(group->tests, group->test_cap * sizeof(TestName));
+    }
+
+    group->tests[group->n_tests++] = (TestName){.test = test, .name = name};
+}
+
+void run_tests(Tester *tester) {
+    if (!tester)
+        return;
+
+    size_t total_passed = 0;
+    size_t total_failed = 0;
+    char buf[80];
+
+    print_center("START", WHITE, '=');
+
+    for (size_t i = 0; i < tester->n_groups; i++) {
+        nl;
+        TestGroup *group = tester->groups + i;
+        size_t tests_passed = 0;
+        size_t tests_failed = 0;
+
+        print_center(group->name, WHITE, '-');
+
+        for (size_t j = 0; j < group->n_tests; j++) {
+            failed = 0;
+            printf("%s:\n", group->tests[j].name);
+            group->tests[j].test();
+            if (failed) {
+                tests_failed += 1;
+                print_color("--- FAILED ---\n", RED);
+            }
+            else {
+                tests_passed += 1;
+                print_color("--- PASSED ---\n", GREEN);
+            }
+        }
+
+        print_center("GROUP SUMMARY", WHITE, '-');
+
+        sprintf(buf, "%zu PASSED", tests_passed);
+        print_center(buf, GREEN, ' ');
+        sprintf(buf, "%zu FAILED", tests_failed);
+        print_center(buf, RED, ' ');
+        if (i < tester->n_groups - 1) {
+            nl;
+            print_center("TESTING", WHITE, '=');
+        }
+
+        total_passed += tests_passed;
+        total_failed += tests_failed;
+    }
+
+    nl;
+    print_center("TESTS SUMMARY", WHITE, '=');
+    sprintf(buf, "%zu PASSED", total_passed);
+    print_center(buf, GREEN, ' ');
+    sprintf(buf, "%zu FAILED", total_failed);
+    print_center(buf, RED, ' ');
+    print_center("END", WHITE, '=');
+}
+
+void free_tester(Tester *tester) {
+    if (!tester)
+        return;
+
+    for (size_t i = 0; i < tester->n_groups; i++) {
+        free(tester->groups[i].tests);
+    }
+    free(tester->groups);
+    free(tester);
+}
-- 
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