Mocha run configuration with file filter

Hi

Using IDEA  13.0.3

I am running tests from IDEA with a mocha run configuration/

I have dircetory with tests , and I need a way to filter several of the tests in the directory. I dont want to run all of them

I couldnt find a way to filter specific js test . it only allows me to select a Test Directory

Can someone please help

Thanks.