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diff --git a/src/lib/testutils/sandbox.h b/src/lib/testutils/sandbox.h
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+// Copyright (C) 2019,2021 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef SANDBOX_H
+#define SANDBOX_H
+
+#include <exceptions/exceptions.h>
+
+#include <iostream>
+#include <string>
+#include <cstdlib>
+#include <cstdio>
+#include <unistd.h>
+#include <ftw.h>
+
+namespace isc {
+namespace test {
+
+/// @brief A Sandbox class that provides access to unit test unique
+///    temporary folder.
+///
+/// The sandbox's temporary folder is created in constructor ie.
+/// in unit test setup phase, and then it is deleted with its content
+/// in destructor ie. in unit test tear down phase.
+class Sandbox {
+private:
+    /// Path to temporary folder
+    std::string path_;
+
+    /// @brief Method for deleting files and folders, used in nftw traversal function.
+    ///
+    /// @param fpath path to the file to be removed.
+    static int rmFile(const char *fpath, const struct stat *, int , struct FTW *) {
+        return(remove(fpath));
+    }
+
+public:
+    /// @brief Sandbox constructor.
+    Sandbox() {
+        char tmpl[] = {P_tmpdir "/kea-XXXXXX"};
+        path_ = mkdtemp(tmpl);
+    }
+
+    /// @brief Destructor, it deletes temporary folder with its content.
+    ~Sandbox() {
+        // Delete content of path_ recursively.
+        if (nftw(path_.c_str(), Sandbox::rmFile, 10, FTW_DEPTH | FTW_MOUNT | FTW_PHYS) < 0) {
+            auto msg = "Some error occurred while deleting unit test sandbox " + path_;
+            std::perror(msg.c_str());
+            exit(1);
+        }
+    }
+
+    /// @brief Join sandbox path with indicated file subpath.
+    ///
+    /// @param file path to file that should be joined to base path of sandbox.
+    std::string join(std::string file) {
+        return (path_ + "/" + file);
+    }
+};
+
+
+}; // end of isc::test namespace
+}; // end of isc namespace
+
+#endif // SANDBOX_H