Remove unused variables and correctly override test class method

[christophfroehlich]

ros-controls/ros2_control_cmake#15

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.25%. Comparing base (7b7ecb7) to head (2d666dc).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1918      +/-   ##
==========================================
- Coverage   85.26%   85.25%   -0.02%     
==========================================
  Files         143      143              
  Lines       13793    13790       -3     
  Branches     1196     1197       +1     
==========================================
- Hits        11760    11756       -4     
  Misses       1636     1636              
- Partials      397      398       +1     

Flag	Coverage Δ
unittests	85.25% <100.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...ory_controller/test/test_trajectory_controller.cpp	99.80% <ø> (-0.01%)	⬇️
...ntroller/test/test_trajectory_controller_utils.hpp	84.52% <100.00%> (ø)

... and 1 file with indirect coverage changes

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