Further improvements of launch tests

[norro]

Now using launch_ros node action

Signed-off-by: Nordmann Arne (CR/ADT3) arne.nordmann@de.bosch.com

[codecov]

Codecov Report

Merging #72 (98d067d) into master (0b90a5d) will increase coverage by 3.91%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
+ Coverage   27.57%   31.48%   +3.91%     
==========================================
  Files          14       14              
  Lines        1048     1048              
  Branches      754      754              
==========================================
+ Hits          289      330      +41     
+ Misses        272      159     -113     
- Partials      487      559      +72     

Impacted Files	Coverage Δ
system_modes/src/system_modes/mode_observer.cpp	20.00% <0.00%> (ø)
system_modes/src/system_modes/mode_inference.cpp	35.42% <0.00%> (+0.27%)	⬆️
system_modes/src/system_modes/mode.cpp	55.73% <0.00%> (+9.83%)	⬆️
system_modes/src/system_modes/mode_monitor.cpp	26.98% <0.00%> (+26.19%)	⬆️
system_modes/include/system_modes/mode_monitor.hpp	100.00% <0.00%> (+100.00%)	⬆️

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[ralph-lange]

LGTM