From f4154836aea19da5ac29a4855ea24caec193168b Mon Sep 17 00:00:00 2001
From: Andreas Fabri <andreas.fabri@geometryfactory.com>
Date: Mon, 11 Dec 2023 08:35:02 +0000
Subject: [PATCH] Kernel_23: Deal with concurrent executions and IO

---
 .../test/Kernel_23/include/CGAL/_test_io.h      | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/Kernel_23/test/Kernel_23/include/CGAL/_test_io.h b/Kernel_23/test/Kernel_23/include/CGAL/_test_io.h
index eebd53cd03f..886832d0508 100644
--- a/Kernel_23/test/Kernel_23/include/CGAL/_test_io.h
+++ b/Kernel_23/test/Kernel_23/include/CGAL/_test_io.h
@@ -17,26 +17,19 @@
 #ifndef CGAL__TEST_IO_H
 #define CGAL__TEST_IO_H
 
-#include <fstream>
+#include <sstream>
 #include <cassert>
 
-#ifndef TEST_FILENAME
-#  define TEST_FILENAME "Test_IO.out"
-#endif
-
 template <class T>
 void
 _test_io_for(const T& t)
 {
-    {
-        std::ofstream oFile(TEST_FILENAME, std::ios::out);
-        oFile << t << std::endl;
-    }
+    std::stringstream ss;
+    ss << t << std::endl;
 
-    std::ifstream iFile(TEST_FILENAME, std::ios::in);
     T u = t;
-    iFile >> u;
-    assert(!iFile.fail());
+    ss >> u;
+    assert(! ss.fail() );
     assert(u == t);
 }