diff --git a/app/test_app.h b/app/test_app.h
new file mode 100644
index 0000000..d60827c
--- /dev/null
+++ b/app/test_app.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2017-2022, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#ifndef __TFM_TEST_APP_H__
+#define __TFM_TEST_APP_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Simple macro to mark UNUSED variables
+ *
+ */
+#define UNUSED_VARIABLE(X) ((void)(X))
+
+/**
+ * \brief Main test application for the RTX-TFM core
+ *        integration tests
+ *
+ */
+void test_app(void *argument);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __TFM_TEST_APP_H__ */