Simualtion of test benches

Modelsim is a proper VHDL / verilog simulator - yes, it will simulate your VHDL testbenches.

A proper simulator handles VHDL and doesn't care which bits of it happen to be synthesisable as it does not do synthesis.

When you sign up for your Quartus web edition licence you have to select whether or not you want the Modelsim licence included with it. If you have licensing problems then double check what box you ticked.