diff --git a/test/test_helpers.hpp b/test/test_helpers.hpp
index 15d20f6..98ee090 100644
--- a/test/test_helpers.hpp
+++ b/test/test_helpers.hpp
@@ -34,23 +34,13 @@ struct buffer {
 
 [[maybe_unused]] inline buffer buff;
 
-std::string time_now_rand() {
-    std::stringstream ss;
-    auto t = std::time(nullptr);
-    auto tm = *std::localtime(&t);
-    ss << std::put_time(&tm, "%d%m%Y%H%M%S");
-    srand(time(nullptr));
-    return ss.str() + std::to_string(rand());
-}
-
 struct unique_file_name {
-    static inline int i = 0;
+    std::string name;
 
-    const std::string name;
-
-    unique_file_name(const std::string& test)
-        : name{"random_" + test + "_" + std::to_string(i++) + "_" +
-               time_now_rand() + "_file.csv"} {
+    unique_file_name(const std::string& test) {
+        do {
+            name = std::tmpnam(nullptr) + std::string{"_random_test_"} + test;
+        } while (std::filesystem::exists(name));
     }
 
     ~unique_file_name() {