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diff --git a/src/H5VLtest.c b/src/H5VLtest.c
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+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the COPYING file, which can be found at the root of the source code       *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * If you do not have access to either file, you may request a copy from     *
+ * help@hdfgroup.org.                                                        *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*-------------------------------------------------------------------------
+ *
+ * Created:		H5VLtest.c
+ *			Jan  3 2021
+ *			Quincey Koziol
+ *
+ * Purpose:		Virtual Object Layer (VOL) testing routines.
+ *
+ *-------------------------------------------------------------------------
+ */
+
+/****************/
+/* Module Setup */
+/****************/
+
+#include "H5VLmodule.h" /* This source code file is part of the H5VL module */
+#define H5VL_TESTING    /* Suppress warning about H5VL testing funcs        */
+
+/***********/
+/* Headers */
+/***********/
+#include "H5private.h"  /* Generic Functions                    */
+#include "H5Eprivate.h" /* Error handling                       */
+#include "H5VLpkg.h"    /* Virtual Object Layer                 */
+
+/****************/
+/* Local Macros */
+/****************/
+
+/******************/
+/* Local Typedefs */
+/******************/
+
+/********************/
+/* Package Typedefs */
+/********************/
+
+/********************/
+/* Local Prototypes */
+/********************/
+
+/*********************/
+/* Package Variables */
+/*********************/
+
+/*****************************/
+/* Library Private Variables */
+/*****************************/
+
+/*******************/
+/* Local Variables */
+/*******************/
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__reparse_def_vol_conn_variable_test
+ *
+ * Purpose:     Re-parse the default VOL connector environment variable.
+ *
+ *              Since getenv(3) is fairly expensive, we only parse it once,
+ *              when the library opens. This test function is used to
+ *              re-parse the environment variable after we've changed it
+ *              with setenv(3).
+ *
+ * Return:      SUCCEED/FAIL
+ *
+ * Programmer:	Quincey Koziol
+ *              Feb 3, 2021
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5VL__reparse_def_vol_conn_variable_test(void)
+{
+    herr_t ret_value = SUCCEED;
+
+    FUNC_ENTER_PACKAGE
+
+    /* Re-check for the HDF5_VOL_CONNECTOR environment variable */
+    if (H5VL__set_def_conn() < 0)
+        HGOTO_ERROR(H5E_VOL, H5E_CANTINIT, FAIL, "unable to initialize default VOL connector")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__reparse_def_vol_conn_variable_test() */