Re-introduction of key slot chekcs

Signed-off-by: TRodziewicz <tomasz.rodziewicz@mobica.com>
diff --git a/tests/src/helpers.c b/tests/src/helpers.c
index 4d3d53d..bf25f21 100644
--- a/tests/src/helpers.c
+++ b/tests/src/helpers.c
@@ -274,3 +274,13 @@
         return( mbedtls_mpi_read_string( X, radix, s ) );
 }
 #endif
+
+#if defined(MBEDTLS_TEST_HOOKS)
+void mbedtls_test_hook_value_check( int test, const char * file, int line )
+{
+    if ( !test )
+    {
+        mbedtls_test_fail( "Wrong value in test", line, file );
+    }
+}
+#endif