Simple tests that will render a raster and a vector map and
hopefully the valgrind bot will detect something wrong if any.
The other test will look for application lifetime leaks that cannot
be detected with valgrind. It can also detect GL leaks if they are
very expressive. A threshold is needed because of memory will grow
anyway due to fragmentation.
The StupFileSource of the memory test will do the rendering
completely offline with a vector tile that is densly populated
with features and a raster tile of the same region.
The styles are streets and satellite respectivelly.