mtest: Refactor test data checking
mtest: Refactor test data checking

jpakkane/meson,jpakkane/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,pexip/meson,pexip/meson,mesonbuild/meson,QuLogic/meson,QuLogic/meson,QuLogic/meson,QuLogic/meson,mesonbuild/meson,pexip/meson,pexip/meson,mesonbuild/meson,jpakkane/meson,jpakkane/meson,mesonbuild/meson,mesonbuild/meson,QuLogic/meson,QuLogic/meson,pexip/meson,jpakkane/meson,jpakkane/meson,mesonbuild/meson,mesonbuild/meson,jpakkane/meson,pexip/meson,QuLogic/meson,pexip/meson,pexip/meson,pexip/meson,QuLogic/meson,mesonbuild/meson,QuLogic/meson,jpakkane/meson,jpakkane/meson