c.Assert(err, check.IsNil)
c.Check(tseq, check.DeepEquals, tileSeq{"test-seq": []tileLibRef{{0, 1}, {1, 1}, {3, 1}, {4, 1}}})
c.Assert(err, check.IsNil)
c.Check(tseq, check.DeepEquals, tileSeq{"test-seq": []tileLibRef{{0, 1}, {1, 1}, {3, 1}, {4, 1}}})