TEL-26: Add Unit tests for mysql plugin

https://perconadev.atlassian.net/browse/TEL-26

Percona Telemetry Component unit tests added

Author: kamil-holubicki

components/percona_telemetry/data_provider.h

@@ -61,7 +61,7 @@ class DataProvider {
       SERVICE_TYPE(mysql_command_thread) & command_thread_service,
       Logger &logger);
 
-  ~DataProvider() = default;
+  virtual ~DataProvider() = default;
 
   DataProvider(const DataProvider &rhs) = delete;
   DataProvider(DataProvider &&rhs) = delete;
@@ -73,9 +73,9 @@ class DataProvider {
   std::string get_report();
 
  private:
-  bool do_query(const std::string &query, QueryResult *result,
-                unsigned int *err_no = nullptr,
-                bool suppress_query_error_log = false);
+  virtual bool do_query(const std::string &query, QueryResult *result,
+                        unsigned int *err_no = nullptr,
+                        bool suppress_query_error_log = false);
   bool collect_db_instance_id_info(rapidjson::Document *document);
   bool collect_product_version_info(rapidjson::Document *document);
   bool collect_plugins_info(rapidjson::Document *document);

unittest/gunit/CMakeLists.txt

@@ -467,6 +467,7 @@ ADD_SUBDIRECTORY(innodb)
 ADD_SUBDIRECTORY(keyring)
 ADD_SUBDIRECTORY(components/mysql_server)
 ADD_SUBDIRECTORY(components/keyring_common)
+ADD_SUBDIRECTORY(components/percona_telemetry)
 ADD_SUBDIRECTORY(xplugin)
 ADD_SUBDIRECTORY(group_replication)
 ADD_SUBDIRECTORY(libmysqlgcs)

unittest/gunit/components/percona_telemetry/CMakeLists.txt

@@ -0,0 +1,43 @@
+# Copyright (c) 2024 Percona LLC and/or its affiliates. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; version 2 of
+# the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+   
+MY_CHECK_CXX_COMPILER_WARNING("-Wno-unused-local-typedefs" HAS_WARN_FLAG)
+IF(HAS_WARN_FLAG)
+  STRING_APPEND(CMAKE_CXX_FLAGS " ${HAS_WARN_FLAG}")
+ENDIF()
+
+INCLUDE_DIRECTORIES(SYSTEM
+  ${GMOCK_INCLUDE_DIRS}
+)
+
+SET(PERCONA_TELEMETRY_COMPONENT_SRC
+  ${CMAKE_SOURCE_DIR}/components/percona_telemetry/data_provider.cc
+)
+
+SET(LOCAL_MOCK_SRC
+  logger.cc
+)
+
+# Add tests
+SET(TESTS
+  data_provider
+  )
+
+FOREACH(test ${TESTS})
+  MYSQL_ADD_EXECUTABLE(${test}-t ${PERCONA_TELEMETRY_COMPONENT_SRC} ${LOCAL_MOCK_SRC} ${test}-t.cc ADD_TEST ${test} LINK_LIBRARIES ${PERCONA_TELEMETRY_COMPONENT_LIBS} DEPENDENCIES component_percona_telemetry)
+  TARGET_LINK_LIBRARIES(${test}-t mysys gunit_small)
+ENDFOREACH()
+