TEST: Using negative selections (see #366)

[ThomasRitaine]

Content

Contribution demandée dans le dernier exercice du TD du 15/04/2021

---

Checklist

Please check that your pull request is correct:

• Each commit:
  • [ ] corresponds to a contribution that should be notified to users,
  • [X] does not generate new errors or warnings at compile or test time,
  • [X] must be attributed to its real authors (with correct GitHub IDs and correct syntax for multiple authors).
• The title of a commit should:
  • [X] begin with a contribution type
    • FEATURE for a behaviour allowing a user to do something new,
    • FIX for a behaviour which has been changed in order to meet user’s expectations,
    • TEST when it concerns an acceptance test,
    • PROCESS for a change in the way the software is built, tested, deployed,
    • DOC when it concerns only internal documentation (however it is better to combine it with the contribution that required this documentation change),
  • [X] be followed by a colon (:) with one space after and no space before,
  • [X] be followed by a title (written in English) as short, as user-centered and as explicit as possible
    • If it is a feature, the title must be the user action (beginning with a verb, and please not manage),
    • If it is a fix, the title must describe the intended behavior (with should).
  • [X] ends with a reference to the corresponding ticket with the following syntax:
    • (closes #xx) if xx is a feature ticket (and the commit is a complete implementation),
    • (fixes #xx) if xx is a fix ticket (and the commit is a complete fix),
    • (see #xx) otherwise,
• Each committed line is:
  • [X] useful (it would not work if removed)
    • if it is a comment line, its information could not be conveyed by better variables and function naming, better code structuring, or better commit message,
  • [X] related to this very contribution (feature, fix...),
  • [X] in English (with the exception of Gherkin scenarios in French and resulting steps),
  • [X] without any typo in variable, class or function names,
  • [X] correctly indented (spaces rather than tabs, same number of characters as in the rest of the file).