[Bug 769637] rawparse: Unit test fixes and additions

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=769637
Bug 769637 depends on bug 769797, which changed state.

Bug 769797 Summary: videoparse: format i420, invalid buffer size (regression)
https://bugzilla.gnome.org/show_bug.cgi?id=769797

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

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