cubicweb #17047303 speed-up cube tests [open]

CubicWeb test are slooooow. Part of this is due to the fact that the test framework it provides handle by default the most complicated case where registered app objects may change from a fixture to another, while this is needed only for test in cubicweb itself.

Changing this default behaviour ends up with a desirable speed-up.

See https://hg.logilab.org/master/cubes/saem_ref/rev/290cb15e914a for inspiration

prioritynormal
typeenhancement
done in<not specified>
closed by<not specified>