Currently the -n switch requires a presence of two files (name.spec & name.srpm). It would be nice if you could introduce a new switch to skip the name*.spec presence check and to use the spec file contained in the srpm package instead. This is useful for checks performed by the maintainer prior to the review request creation.
Fixed in 005f481ad158c7. PLease use current master when testing, there are bugfixes applied after the initial commit.
Also note the current code includes a standard test verifying that the spec file given in a URL is identical to the one in the srpm.
Closing. Please feel free to reopen bug if need be.