Issues with ament CmakeLists

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Hello All,

I just started out with ROS 2.0. I have the latest build. I am unsure if I am doing something stupid or missing out something. However, I can’t build these simple files. If I should have posted somewhere else kindly let me know.

The command used for building:

ament build --symlink-install --only-package testpackage

Error thrown:

Process package 'testpackage' with context:
--------------------------------------------------------------------------------
 source_space => /home/artc/ros2_ws/src/ros2/testpackage
  build_space => /home/artc/ros2_ws/build/testpackage
install_space => /home/artc/ros2_ws/install
   make_flags => -j4, -l4
  build_tests => False
--------------------------------------------------------------------------------
+++ Building 'testpackage'
==> '. /home/artc/ros2_ws/build/testpackage/cmake__build.sh && /usr/bin/make cmake_check_build_system' in '/home/artc/ros2_ws/build/testpackage'
==> '. /home/artc/ros2_ws/build/testpackage/cmake__build.sh && /usr/bin/make -j4 -l4' in '/home/artc/ros2_ws/build/testpackage'
[ 50%] Built target test_lib
[ 75%] Linking CXX executable test_node
CMakeFiles/test_node.dir/src/test_node.cpp.o: In function `main':
test_node.cpp:(.text+0x161): undefined reference to `testRos2::testRos2()'
test_node.cpp:(.text+0x174): undefined reference to `testRos2::initialize(std::shared_ptr<rclcpp::node::Node>&)'
test_node.cpp:(.text+0x1b0): undefined reference to `testRos2::~testRos2()'
test_node.cpp:(.text+0x1ef): undefined reference to `testRos2::~testRos2()'
collect2: error: ld returned 1 exit status
CMakeFiles/test_node.dir/build.make:123: recipe for target 'test_node' failed
make[2]: *** [test_node] Error 1
CMakeFiles/Makefile2:136: recipe for target 'CMakeFiles/test_node.dir/all' failed
make[1]: *** [CMakeFiles/test_node.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2

<== Command '. /home/artc/ros2_ws/build/testpackage/cmake__build.sh && /usr/bin/make -j4 -l4' failed in '/home/artc/ros2_ws/build/testpackage' with exit code '2'
<== Command '. /home/artc/ros2_ws/build/testpackage/cmake__build.sh && /usr/bin/make -j4 -l4' failed in '/home/artc/ros2_ws/build/testpackage' with exit code '2'

This is my test_node.cpp

#include <testpackage/testpackage.h>
 int main(int argc, char * argv[]){
 rclcpp::init(argc, argv);
 auto node = rclcpp::node::Node::make_shared("test");
 testRos2 test_object;
 test_object.initialize(node);
 rclcpp::spin(node);
 return 0;
}

This is my test.cpp

#include <testpackage/testpackage.h>
 testRos2::testRos2(){    }
 testRos2::~testRos2(){  }
 void testRos2::initialize(std::shared_ptr<rclcpp::node::Node>& n){
}

This is my header:

#pragma once
#ifndef TESTPACKAGE
#define TESTPACKAGE

#include <iostream>
#include <string>

#include "rclcpp/rclcpp.hpp"
#include "std_msgs/msg/string.hpp"

using namespace std;

class testRos2{

public:
 testRos2();
~testRos2();
 void initialize(std::shared_ptr<rclcpp::node::Node>&);
 };
#endif

CMakeLists:

project(testpackage)

if(NOT WIN32)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -Wall -Wextra")
endif()

find_package(ament_cmake REQUIRED)
find_package(rclcpp REQUIRED)
find_package(std_msgs REQUIRED)

include_directories(include 
            ${rclcpp_INCLUDE_DIRS}
            ${rmw_implementation_INCLUDE_DIRS}
            ${std_msgs_INCLUDE_DIRS})

add_library(test_lib
  src/test.cpp
 )
target_link_libraries(test_lib ${rclcpp_LIBRARIES} ${rmw_implementation_LIBRARIES} ${std_msgs})

add_executable(test_node src/test_node.cpp)
ament_target_dependencies(test_node test_lib rclcpp std_msgs)

install(
 DIRECTORY include/${PROJECT_NAME}/
 DESTINATION include
)

 install(
  TARGETS test_lib test_node 
 ARCHIVE DESTINATION lib
 LIBRARY DESTINATION lib
 RUNTIME DESTINATION bin
)

ament_package()