[Bug 776710] document how to run tests

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776710

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 342713
  --> https://bugzilla.gnome.org/attachment.cgi?id=342713&action=edit
README: document how to run tests

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