unit test case for MDEV-4576

unittest/mysys/CMakeLists.txt

@@ -19,3 +19,7 @@ INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/sql
 
 MY_ADD_TESTS(bitmap base64 my_vsnprintf my_atomic my_rdtsc lf my_malloc
              LINK_LIBRARIES mysys)
+
+IF(WIN32)
+  MY_ADD_TESTS(my_delete LINK_LIBRARIES mysys)
+ENDIF()
\ No newline at end of file

unittest/mysys/my_delete-t.c

+/* Copyright (c) 2011, Monty Program Ab
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+#include <my_global.h>
+#include <my_sys.h>
+#include "tap.h"
+
+
+int main(int argc __attribute__((unused)),char *argv[])
+{
+  char tmp_dir[MAX_PATH];
+  char tmp_filename[MAX_PATH];
+  HANDLE h, h2;
+
+  MY_INIT(argv[0]);
+
+  plan(6);
+
+  GetTempPathA(MAX_PATH, tmp_dir);
+  ok(GetTempFileNameA(tmp_dir, "foo", 0,  tmp_filename) != 0, "create temp file");
+  ok(my_delete(tmp_filename,MYF(0)) == 0, "Delete closed file");
+
+
+  /* Delete an open file */
+  ok(GetTempFileNameA(tmp_dir, "foo", 0,  tmp_filename) != 0, "create temp file 2");
+  h = CreateFileA(tmp_filename, GENERIC_READ|GENERIC_WRITE, 
+      FILE_SHARE_DELETE, NULL, OPEN_EXISTING, 0, NULL);
+  ok (h != INVALID_HANDLE_VALUE || h != 0, "open temp file");
+  ok(my_delete(tmp_filename, MYF(0)) == 0, "Delete open file");
+
+
+  /* 
+    Check if it is possible to reuse file name after delete (not all handles 
+    to it are closed.
+  */
+  h2 = CreateFileA(tmp_filename, GENERIC_READ|GENERIC_WRITE, 
+        FILE_SHARE_DELETE, NULL, CREATE_NEW, FILE_FLAG_DELETE_ON_CLOSE, NULL);
+  ok(h2 != 0 && h2 != INVALID_HANDLE_VALUE, "Reuse file name");
+  CloseHandle(h);
+  CloseHandle(h2);
+
+  my_end(0);
+  return exit_status();
+}
+