## Problem
When building openarm_ros2, the hardware interface tests fail because
the components_urdfs.hpp header from ros2_control_test_assets cannot be
found as
follows.
```console
$ colcon build
...
/home/otegami/work/cpp/ros2_ws/src/openarm_ros2/openarm_hardware/test/test_openarm_hardware.cpp:21:10: fatal error: ros2_control_test_assets/components_urdfs.hpp: No such file or directory
21 | #include "ros2_control_test_assets/components_urdfs.hpp"
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
gmake[2]: *** [CMakeFiles/test_openarm_hardware.dir/build.make:79: CMakeFiles/test_openarm_hardware.dir/test/test_openarm_hardware.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:237: CMakeFiles/test_openarm_hardware.dir/all] Error 2
gmake: *** [Makefile:146: all] Error 2
---
Failed <<< openarm_hardware [14.9s, exited with code 2]
Summary: 6 packages finished [15.1s]
1 package failed: openarm_hardware
5 packages had stderr output: openarm_bimanual_bringup openarm_bimanual_description openarm_bringup openarm_description openarm_hardware
1 package not processed
```
## Cause
Although ros2_control_test_assets was installed, it wasn’t declared as a
dependency of the GMock test
target.
## Solution
Add ros2_control_test_assets as a test dependency in both the
CMakeLists.txt and in the package.xml,
ensuring the test can locate its headers.
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