My Question: I need to send a test fax somewhere, can i do this with windows somehow without an actual landline?
Faxes use the Plain Old Telephone System with its analog signalling. So you can’t send a Fax directly from your PC without a regular (not DSL) phone line. However there are pay services that will send a fax on your behalf directly from your PC. One is EFax. I’m sure there are others. Unfortunately, they are a subscription service at around per month.
There used to be some free services around, but since the internet has grown so large, I think they have all disbanded.