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diff --git a/src/bin/dhcp6/tests/dhcp6_message_test.h b/src/bin/dhcp6/tests/dhcp6_message_test.h
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+// Copyright (C) 2014-2015,2021 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 DHCP6_MESSAGE_TEST_H
+#define DHCP6_MESSAGE_TEST_H
+
+#include <asiolink/io_address.h>
+#include <dhcp/tests/iface_mgr_test_config.h>
+#include <dhcp6/tests/dhcp6_client.h>
+#include <dhcp6/tests/dhcp6_test_utils.h>
+
+namespace isc {
+namespace dhcp {
+namespace test {
+
+/// @brief Base class for test fixture classes used to validate the DHCPv6
+/// message processing by the server.
+class Dhcpv6MessageTest : public Dhcpv6SrvTest {
+public:
+    /// @brief Constructor.
+    ///
+    /// Sets up interfaces.
+    Dhcpv6MessageTest();
+
+    /// @brief Increases last byte of the address.
+    ///
+    /// This function is helpful to find a different address that is within
+    /// the same subnet as the input address. It is achieved by increasing
+    /// the last byte of the input address by one.
+    ///
+    /// @param input_addr An input address.
+    ///
+    /// @return New address.
+    asiolink::IOAddress bumpAddress(const asiolink::IOAddress& input_addr);
+
+    /// @brief Increases specific byte in the address by one.
+    ///
+    /// This function is called by @c bumpAddress and @c bumpSubnet.
+    ///
+    /// @warning This function is no-op if the byte index is out of range.
+    ///
+    /// @param input_addr An input address
+    /// @param byte_num An index of the byte which value should be increased..
+    ///
+    /// @return New address.
+    asiolink::IOAddress bumpByteInAddress(const asiolink::IOAddress& input_addr,
+                                          const size_t byte_num);
+
+    /// @brief Increases the first byte of the address.
+    ///
+    /// This function is helpful to find an address which belongs to the
+    /// different subnet than the input address. It is achieved by increasing
+    /// the first byte of the input address.
+    ///
+    /// @param input_addr An input addres.
+    ///
+    /// @return New address.
+    asiolink::IOAddress bumpSubnet(const asiolink::IOAddress& input_addr);
+
+    /// @brief Make 4-way exchange to obtain a lease.
+    ///
+    /// @param config Configuration in the JSON format to be applied before the
+    /// lease is requested..
+    /// @param subnets_num Number of subnets being created with the specified
+    /// configuration.
+    /// @param client Object representing a test DHCPv6 client to use.
+    void requestLease(const std::string& config, const int subnets_num,
+                      Dhcp6Client& client);
+
+
+protected:
+
+    /// @brief Interface Manager's fake configuration control.
+    IfaceMgrTestConfig iface_mgr_test_config_;
+
+};
+
+} // isc::dhcp::test
+} // isc::dhcp
+} // isc
+
+#endif // DHCP6_MESSAGE_TEST_H