$ valgrind --leak-check=full ./test_parameter_client --gtest_filter="*.sync_parameter_load_parameters"
==1075091== Memcheck, a memory error detector
==1075091== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==1075091== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==1075091== Command: ./test_parameter_client --gtest_filter=*.sync_parameter_load_parameters
==1075091== 
Running main() from /home/chenlh/Projects/ROS2/ros2-master/local_install_test/gtest_vendor/src/gtest_vendor/src/gtest_main.cc
Note: Google Test filter = *.sync_parameter_load_parameters
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from TestParameterClient
[ RUN      ] TestParameterClient.sync_parameter_load_parameters
[       OK ] TestParameterClient.sync_parameter_load_parameters (6336 ms)
[----------] 1 test from TestParameterClient (6343 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test suite ran. (8835 ms total)
[  PASSED  ] 1 test.
==1075091== 
==1075091== HEAP SUMMARY:
==1075091==     in use at exit: 93,286 bytes in 178 blocks
==1075091==   total heap usage: 46,099 allocs, 45,921 frees, 8,914,054 bytes allocated
==1075091== 
==1075091== 46,251 (72 direct, 46,179 indirect) bytes in 1 blocks are definitely lost in loss record 73 of 73
==1075091==    at 0x4841D99: calloc (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==1075091==    by 0x56E109F: __default_zero_allocate (allocator.c:62)
==1075091==    by 0x5B79678: rcl_yaml_node_struct_init_with_capacity (parser.c:58)
==1075091==    by 0x5B795EF: rcl_yaml_node_struct_init (parser.c:46)
==1075091==    by 0x5383876: rclcpp::parameter_map_from_yaml_file(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) (parameter_map.cpp:148)
==1075091==    by 0x53235D8: rclcpp::AsyncParametersClient::load_parameters(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) (parameter_client.cpp:293)
==1075091==    by 0x5324A97: rclcpp::SyncParametersClient::load_parameters(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::chrono::duration<long, std::ratio<1l, 1000000000l> >) (parameter_client.cpp:495)
==1075091==    by 0x36B74D: std::vector<rcl_interfaces::msg::SetParametersResult_<std::allocator<void> >, std::allocator<rcl_interfaces::msg::SetParametersResult_<std::allocator<void> > > > rclcpp::SyncParametersClient::load_parameters<long, std::ratio<1l, 1000l> >(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::chrono::duration<long, std::ratio<1l, 1000l> >) (parameter_client.hpp:523)
==1075091==    by 0x358178: TestParameterClient_sync_parameter_load_parameters_Test::TestBody() (test_parameter_client.cpp:945)
==1075091==    by 0x422BA7: void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) (gtest.cc:2433)
==1075091==    by 0x41BEA4: void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) (gtest.cc:2469)
==1075091==    by 0x3F730F: testing::Test::Run() (gtest.cc:2508)
==1075091== 
==1075091== LEAK SUMMARY:
==1075091==    definitely lost: 72 bytes in 1 blocks
==1075091==    indirectly lost: 46,179 bytes in 24 blocks
==1075091==      possibly lost: 0 bytes in 0 blocks
==1075091==    still reachable: 47,035 bytes in 153 blocks
==1075091==         suppressed: 0 bytes in 0 blocks
==1075091== Reachable blocks (those to which a pointer was found) are not shown.
==1075091== To see them, rerun with: --leak-check=full --show-leak-kinds=all
==1075091== 
==1075091== For lists of detected and suppressed errors, rerun with: -s
==1075091== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)