update: test files should use the naming convention

Signed-off-by: Lorenzo Fontana <lo@linux.com>

tests/test_base.cpp

@@ -0,0 +1,22 @@
+/*
+Copyright (C) 2016-2019 Draios Inc dba Sysdig.
+
+This file is part of falco.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+#define CATCH_CONFIG_MAIN
+#include <catch.hpp>
+
+TEST_CASE( "1: All test cases reside in other .cpp files (empty)", "[multi-file:1]" ) {
+}