Update source/installation/test_situations.md
Update source/installation/test_situations.md

Co-authored-by: Hajar AIT EL KADI <ccb9f0d3a0a174d2804cee97f21102b7ba11b999@users.noreply.github.com>
openfisca/openfisca-doc,openfisca/openfisca-doc,openfisca/openfisca-doc,openfisca/openfisca-doc