The Quartus simulator does not support general VHDL test benches, and can't automatically convert them to waveform files. You should use a 3rd party simulator if you want to use a VHDL testbench. If you bought the full version of Quartus, there will be an OEM version of ModelSim included with it that can read your VHDL test bench.
If you are using Quartus web edition and don't want to buy a 3rd party simulator, you will have to make a stimulus file in a format the Quartus simulator can read (e.g. .vwf or .vec).
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