diff --git a/components/messaging/ffa/libsp/test/mock_sp_rxtx.cpp b/components/messaging/ffa/libsp/test/mock_sp_rxtx.cpp
new file mode 100644
index 0000000..24111b8
--- /dev/null
+++ b/components/messaging/ffa/libsp/test/mock_sp_rxtx.cpp
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) 2020-2021, Arm Limited. All rights reserved.
+ */
+
+#include <CppUTestExt/MockSupport.h>
+#include "mock_sp_rxtx.h"
+
+void expect_sp_rxtx_buffer_map(void *tx_buffer, const void *rx_buffer,
+			       size_t size, sp_result result)
+{
+	mock().expectOneCall("sp_rxtx_buffer_map")
+		.withPointerParameter("tx_buffer", tx_buffer)
+		.withConstPointerParameter("rx_buffer", rx_buffer)
+		.withUnsignedIntParameter("size", size)
+		.andReturnValue(result);
+}
+
+sp_result sp_rxtx_buffer_map(void *tx_buffer, const void *rx_buffer,
+			     size_t size)
+{
+	return mock()
+		.actualCall("sp_rxtx_buffer_map")
+		.withPointerParameter("tx_buffer", tx_buffer)
+		.withConstPointerParameter("rx_buffer", rx_buffer)
+		.withUnsignedIntParameter("size", size)
+		.returnIntValue();
+}
+
+void expect_sp_rxtx_buffer_unmap(sp_result result)
+{
+	mock().expectOneCall("sp_rxtx_buffer_unmap").andReturnValue(result);
+}
+
+sp_result sp_rxtx_buffer_unmap(void)
+{
+	return mock().actualCall("sp_rxtx_buffer_unmap").returnIntValue();
+}
+
+void expect_sp_rxtx_buffer_alignment_boundary_get(const uintptr_t *alignment,
+						  sp_result result)
+{
+	mock().expectOneCall("sp_rxtx_buffer_alignment_boundary_get")
+		.withOutputParameterReturning("alignment", alignment,
+					      sizeof(*alignment))
+		.andReturnValue(result);
+}
+
+sp_result sp_rxtx_buffer_alignment_boundary_get(uintptr_t *alignment)
+{
+	return mock()
+		.actualCall("sp_rxtx_buffer_alignment_boundary_get")
+		.withOutputParameter("alignment", alignment)
+		.returnIntValue();
+}
+
+void expect_sp_rxtx_buffer_rx_get(const void **buffer, size_t *size,
+				  sp_result result)
+{
+	mock().expectOneCall("sp_rxtx_buffer_rx_get")
+		.withOutputParameterReturning("buffer", buffer, sizeof(*buffer))
+		.withOutputParameterReturning("size", size, sizeof(*size))
+		.andReturnValue(result);
+}
+
+sp_result sp_rxtx_buffer_rx_get(const void **buffer, size_t *size)
+{
+	return mock()
+		.actualCall("sp_rxtx_buffer_rx_get")
+		.withOutputParameter("buffer", buffer)
+		.withOutputParameter("size", size)
+		.returnIntValue();
+}
+
+void expect_sp_rxtx_buffer_tx_get(void **buffer, size_t *size, sp_result result)
+{
+	mock().expectOneCall("sp_rxtx_buffer_tx_get")
+		.withOutputParameterReturning("buffer", buffer, sizeof(*buffer))
+		.withOutputParameterReturning("size", size, sizeof(*size))
+		.andReturnValue(result);
+}
+
+sp_result sp_rxtx_buffer_tx_get(void **buffer, size_t *size)
+{
+	return mock()
+		.actualCall("sp_rxtx_buffer_tx_get")
+		.withOutputParameter("buffer", buffer)
+		.withOutputParameter("size", size)
+		.returnIntValue();
+}
diff --git a/components/messaging/ffa/libsp/test/mock_sp_rxtx.h b/components/messaging/ffa/libsp/test/mock_sp_rxtx.h
new file mode 100644
index 0000000..c036d36
--- /dev/null
+++ b/components/messaging/ffa/libsp/test/mock_sp_rxtx.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: BSD-3-Clause */
+/*
+ * Copyright (c) 2020-2021, Arm Limited. All rights reserved.
+ */
+
+#ifndef LIBSP_TEST_MOCK_SP_RXTX_H_
+#define LIBSP_TEST_MOCK_SP_RXTX_H_
+
+#include "../include/sp_rxtx.h"
+
+void expect_sp_rxtx_buffer_map(void *tx_buffer, const void *rx_buffer,
+			       size_t size, sp_result result);
+sp_result sp_rxtx_buffer_map(void *tx_buffer, const void *rx_buffer,
+			     size_t size);
+
+void expect_sp_rxtx_buffer_unmap(sp_result result);
+sp_result sp_rxtx_buffer_unmap(void);
+
+void expect_sp_rxtx_buffer_alignment_boundary_get(const uintptr_t *alignment,
+						  sp_result result);
+sp_result sp_rxtx_buffer_alignment_boundary_get(uintptr_t *alignment);
+
+void expect_sp_rxtx_buffer_rx_get(const void **buffer, size_t *size,
+				  sp_result sp_result);
+sp_result sp_rxtx_buffer_rx_get(const void **buffer, size_t *size);
+
+void expect_sp_rxtx_buffer_tx_get(void **buffer, size_t *size,
+				  sp_result result);
+sp_result sp_rxtx_buffer_tx_get(void **buffer, size_t *size);
+
+#endif /* LIBSP_TEST_MOCK_SP_RXTX_H_ */
diff --git a/components/messaging/ffa/libsp/test/test_mock_sp_rxtx.cpp b/components/messaging/ffa/libsp/test/test_mock_sp_rxtx.cpp
new file mode 100644
index 0000000..66f1f84
--- /dev/null
+++ b/components/messaging/ffa/libsp/test/test_mock_sp_rxtx.cpp
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) 2021, Arm Limited. All rights reserved.
+ */
+
+#include <CppUTestExt/MockSupport.h>
+#include <CppUTest/TestHarness.h>
+#include "mock_sp_rxtx.h"
+#include <stdint.h>
+#include <stdlib.h>
+
+static uint8_t tx_buf[16] = { 0 };
+static const uint8_t rx_buf[16] = { 0 };
+
+static void *expected_tx_buffer = tx_buf;
+static const void *expected_rx_buffer = rx_buf;
+static size_t expected_size = 1234;
+
+TEST_GROUP(mock_sp_rxtx)
+{
+	TEST_TEARDOWN()
+	{
+		mock().checkExpectations();
+		mock().clear();
+	}
+
+	static const sp_result result = -1;
+};
+
+TEST(mock_sp_rxtx, sp_rxtx_buffer_map)
+{
+	expect_sp_rxtx_buffer_map(expected_tx_buffer, expected_rx_buffer,
+				  expected_size, result);
+	LONGS_EQUAL(result,
+		    sp_rxtx_buffer_map(expected_tx_buffer, expected_rx_buffer,
+				       expected_size));
+}
+
+TEST(mock_sp_rxtx, sp_rxtx_buffer_unmap)
+{
+	expect_sp_rxtx_buffer_unmap(result);
+	LONGS_EQUAL(result, sp_rxtx_buffer_unmap());
+}
+
+TEST(mock_sp_rxtx, sp_rxtx_buffer_alignment_boundary_get)
+{
+	const uintptr_t expected_alignment = 4096;
+	uintptr_t alignment = 0;
+
+	expect_sp_rxtx_buffer_alignment_boundary_get(&expected_alignment,
+						     result);
+	LONGS_EQUAL(result, sp_rxtx_buffer_alignment_boundary_get(&alignment));
+	UNSIGNED_LONGLONGS_EQUAL(expected_alignment, alignment);
+}
+
+TEST(mock_sp_rxtx, sp_rxtx_buffer_rx_get)
+{
+	const void *buffer = NULL;
+	size_t size = 0;
+
+	expect_sp_rxtx_buffer_rx_get(&expected_rx_buffer, &expected_size,
+				     result);
+	LONGS_EQUAL(result, sp_rxtx_buffer_rx_get(&buffer, &size));
+	POINTERS_EQUAL(expected_rx_buffer, buffer);
+	UNSIGNED_LONGLONGS_EQUAL(expected_size, size);
+}
+
+TEST(mock_sp_rxtx, sp_rxtx_buffer_tx_get)
+{
+	void *buffer = NULL;
+	size_t size = 0;
+
+	expect_sp_rxtx_buffer_tx_get((void **)&expected_tx_buffer,
+				     &expected_size, result);
+	LONGS_EQUAL(result, sp_rxtx_buffer_tx_get(&buffer, &size));
+	POINTERS_EQUAL(expected_tx_buffer, buffer);
+	UNSIGNED_LONGLONGS_EQUAL(expected_size, size);
+}
diff --git a/components/messaging/ffa/libsp/tests.cmake b/components/messaging/ffa/libsp/tests.cmake
index bfa994f..200f8c0 100644
--- a/components/messaging/ffa/libsp/tests.cmake
+++ b/components/messaging/ffa/libsp/tests.cmake
@@ -70,3 +70,15 @@
 	COMPILE_DEFINITIONS
 		-DARM64
 )
+
+unit_test_add_suite(
+	NAME libsp_mock_sp_rxtx
+	SOURCES
+		${CMAKE_CURRENT_LIST_DIR}/test/test_mock_sp_rxtx.cpp
+		${CMAKE_CURRENT_LIST_DIR}/test/mock_sp_rxtx.cpp
+	INCLUDE_DIRECTORIES
+		${CMAKE_CURRENT_LIST_DIR}/include/
+		${PROJECT_PATH}/components/common/utils/include
+	COMPILE_DEFINITIONS
+		-DARM64
+)