Add checkout message

[SandrineP]

Add checkout message
Improve test coverage

[codecov]

Codecov Report

❌ Patch coverage is 79.71014% with 14 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@8c48282). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/subcommand/status_subcommand.cpp	80.95%	8 Missing ⚠️
src/subcommand/checkout_subcommand.cpp	77.77%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #103   +/-   ##
=======================================
  Coverage        ?   86.16%           
=======================================
  Files           ?       60           
  Lines           ?     2219           
  Branches        ?      253           
=======================================
  Hits            ?     1912           
  Misses          ?      307           
  Partials        ?        0           

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