new(test): add test for gvisor config generator

Signed-off-by: Luca Guerra <[email protected]>

userspace/libsinsp/test/CMakeLists.txt

@@ -95,6 +95,7 @@ set(LIBSINSP_UNIT_TESTS_SOURCES
 	events_proc.ut.cpp
 	events_user.ut.cpp
 	external_processor.ut.cpp
+	gvisor_config.ut.cpp
 	mpsc_priority_queue.ut.cpp
 	token_bucket.ut.cpp
 	ppm_api_version.ut.cpp

userspace/libsinsp/test/gvisor_config.ut.cpp

@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+Copyright (C) 2024 The Falco Authors.
+
+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.
+
+*/
+
+#include <memory>
+
+#include <gtest/gtest.h>
+#include <json/json.h>
+
+#include <libsinsp/gvisor_config.h>
+#include <libscap/engine/gvisor/gvisor.h>
+
+TEST(gvisor_config, generate_parse)
+{
+	std::string socket_path = "/run/falco/gvisor.sock";
+	std::string config = gvisor_config::generate(socket_path);
+	Json::Value root;
+	Json::CharReaderBuilder builder;
+	const std::unique_ptr<Json::CharReader> reader(builder.newCharReader());
+	std::string err;
+
+	// check that the output is valid json
+	bool json_parse = reader->parse(config.c_str(), config.c_str() + config.size(), &root, &err);
+	EXPECT_TRUE(json_parse) << "Could not parse configuration file contents: " + err;
+
+	// check that the sink is defined
+	// according to https://github.com/google/gvisor/blob/master/tools/tracereplay/README.md#how-to-use-it
+	EXPECT_EQ(root["trace_session"]["sinks"][0]["config"]["endpoint"].asCString(), socket_path);
+}