Cypress error when trying test

I actually don’t have the folder cypress in lib/pkp in my installation

If I am not mistaken , you have downloaded the OJS from release page rather than cloning from git . In that case, the cypress test related files/folder are not included into the download package as I think no cypress folder also not available in your installation path. One possible way to include those is to get those from github for branch stable-3_3_0 and put accordingly each cypress folder in installation directory and lib/pkp directory .