client_test could be more generic

[infinity0]

I'm building pond without the GUI (-tags nogui) but then client_test fails to build with undefined: FileOpen. It seems very specific to the GUI, maybe some parts could be applied to the CLI too?

[burdges]

A partial fix was merged here : #165

[infinity0]

Ah, I just need to set nogtk instead of nogui, looks like it works. But then the built client thinks that haveGUI = true; I'll send in a patch.

[burdges]

Any client actually built for usage only from the command command line should still use nogui. The abstract GUI built by nogtk is needed for testing, but not for CLI operation.

[infinity0]

But it's quite annoying to have to build it twice, once for running and once for tests. That's not a normal workflow for doing builds.