trouble with Quartus II error

[Altera_Forum]

i write a testbench for a decoder but when i compile this file in quartus,this error comes out. 

 error: can't synthesize current design -- top partition does not contain any logic   but the same design files can be compiled in modelsim successfully.    who can tell me why? how to solve it?

[Altera_Forum]

--- Quote Start ---  i write a testbench for a decoder but when i compile this file in quartus,this error comes out.   error: can't synthesize current design -- top partition does not contain any logic   but the same design files can be compiled in modelsim successfully.    who can tell me why? how to solve it?  --- Quote End ---    Hi,  did you try to synthesize the testbench ? The testbench has no inputs or outputs. I expect that Quartus will remove all your logic, because no output depends on an input. A Testbench is only used for simulation.  Kind regards  GPK

[Altera_Forum]

--- Quote Start ---  Hi,  did you try to synthesize the testbench ? The testbench has no inputs or outputs. I expect that Quartus will remove all your logic, because no output depends on an input. A Testbench is only used for simulation.  Kind regards  GPK  --- Quote End ---        thank you very much! now i knows.