An important warning confused me--tri-state nodes do not directly drive top-level

you wouldnt get this warning in modelsim, because it's to do with the physical chip you are compiling for.

Quartus has decided that you have logic internal to the FPGA that uses tri-state buffers. For some time now no FPGAs have internal tri-state drivers, they only exist on the device pins. If it detects internal tri-states from your code, it converts them to muxes, hence the warning.

It might be because you have dataout declared as an "in" on your test component. But without seeing the code for "test" thats about as much as I can gather.