setupTests.sh can't successfully be run without first running setupDesktop.sh

[yaronyg]

When setupTests.sh runs it depends on things like node_modules having been installed in thali/install. But the setupTests.sh script doesn't do this. The setupDesktop.sh script does though. Normally we don't realize this problem because we either run build.sh (which runs setupDesktop.sh before setupTests.sh) or we run setupDesktop.sh first and then setupTests.sh. But the bug is there. I'm not fixing it now because it's not a priority. But it is embarrassing. :)