[Bug 728368] check: add GstHarness convenience API for unit tests

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=728368
  GStreamer | gstreamer (core) | git

--- Comment #5 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2014-08-12 11:48:28 UTC ---
I plan to get to it this cycle. I will try to put my WIP branch up somewhere
soon.

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