Add (failing) test for loading tm2z for string uri.
Add (failing) test for loading tm2z for string uri.

kartotherian/kartotherian,mapbox/tilelive-vector,kartotherian/kartotherian,nyurik/kartotherian,kartotherian/kartotherian,jaredbrookswhite/tilelive-vector,nyurik/kartotherian,nyurik/kartotherian,nyurik/kartotherian,nyurik/tilelive-vector,kartotherian/kartotherian