What type of data "tests"? aka modeling, simulation, statistical regression, etc.
Wide variety of "what if" data environments/systems which have web accessible interfaces to backends (that are not just database systems).
commerical mathlab, sass
open source[0]: scilab; sagemath; numpy; gnu octave; julia; juniper
[0] : additional link references beyond "5 open source alternatives to MATHLAB" : https://opensource.com/alternatives/matlab