feat: added tests

tests/test.h

@@ -0,0 +1,67 @@
+#ifndef TEST_H
+#define TEST_H
+
+#include <stdio.h>
+#include <setjmp.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+static int _stdout_fd_backup = -1;
+static int _devnull_fd = -1;
+
+static void mute_stdout(void) {
+    fflush(stdout);
+    _stdout_fd_backup = dup(STDOUT_FILENO);
+    _devnull_fd = open("/dev/null", O_WRONLY);
+    dup2(_devnull_fd, STDOUT_FILENO);
+}
+
+static void unmute_stdout(void) {
+    fflush(stdout);
+    if (_stdout_fd_backup != -1) {
+        dup2(_stdout_fd_backup, STDOUT_FILENO);
+        close(_stdout_fd_backup);
+        _stdout_fd_backup = -1;
+    }
+    if (_devnull_fd != -1) {
+        close(_devnull_fd);
+        _devnull_fd = -1;
+    }
+}
+
+
+#define GREEN   "\033[1;32m"
+#define RED     "\033[1;31m"
+#define RESET   "\033[0m"
+
+#define TEST(name) void name(void)
+#define RUN_TEST(test) do { \
+    mute_stdout(); \
+    int result = test_runner(test); \
+    unmute_stdout(); \
+    if (result) \
+        printf("  OK\t%s\n", #test); \
+    else \
+        printf("  FAIL\t%s\n", #test); \
+} while (0)
+
+static jmp_buf env;
+
+static int test_runner(void (*test_func)(void)) {
+    int failed = 0;
+    if (setjmp(env) == 0) {
+        test_func();
+    } else {
+        failed = 1;
+    }
+    return !failed;
+}
+
+#define ASSERT(expr) do { \
+    if (!(expr)) { \
+        longjmp(env, 1); \
+    } \
+} while (0)
+
+#endif