tests: add test_utils.h to git (was ignored by tests/test_* rule)

.gitignore

@@ -77,6 +77,7 @@ logs/
 # Test binaries (executables without extension), but track source/config files
 tests/test_*
 !tests/test_*.c
+!tests/test_*.h
 !tests/test_*.conf
 !tests/test_*.json
 tests/bench_*

tests/test_utils.h

@@ -0,0 +1,73 @@
+/**
+ * @file test_utils.h
+ * @brief Utility functions for cross-platform tests
+ */
+
+#ifndef TEST_UTILS_H
+#define TEST_UTILS_H
+
+#include "../lib/platform_compat.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef _WIN32
+#include <windows.h>
+#include <direct.h>
+
+// Windows temp directory buffer
+static char test_temp_dir[MAX_PATH];
+
+// Cross-platform mkdtemp for Windows
+static inline int test_mkdtemp(char *template_str) {
+    char tmp_path[MAX_PATH];
+    GetTempPathA(MAX_PATH, tmp_path);
+    
+    // Generate unique directory name
+    srand((unsigned int)GetTickCount());
+    int attempts = 0;
+    while (attempts < 100) {
+        snprintf(test_temp_dir, sizeof(test_temp_dir), "%s\\utun_test_%08x", 
+                 tmp_path, (unsigned int)rand());
+        if (_mkdir(test_temp_dir) == 0) {
+            // Copy path back to caller's buffer if provided
+            if (template_str) {
+                size_t len = strlen(test_temp_dir);
+                memcpy(template_str, test_temp_dir, len + 1);  // Include null terminator
+            }
+            return 0;  // Success
+        }
+        attempts++;
+    }
+    return -1;  // Failed after 100 attempts
+}
+
+// Cross-platform unlink for Windows
+static inline int test_unlink(const char *path) {
+    return _unlink(path);
+}
+
+// Cross-platform rmdir for Windows
+static inline int test_rmdir(const char *path) {
+    return _rmdir(path);
+}
+
+#else
+// Linux/macOS - use standard functions
+#include <unistd.h>
+
+static inline int test_mkdtemp(char *template_str) {
+    return (mkdtemp(template_str) == NULL) ? -1 : 0;
+}
+
+static inline int test_unlink(const char *path) {
+    return unlink(path);
+}
+
+static inline int test_rmdir(const char *path) {
+    return rmdir(path);
+}
+
+#endif
+
+#endif // TEST_UTILS_H