def test_sort_by_distance(self):
rna_sort = FeatureSet('Transcripts-ex1.txt')
position = 4250000
# Do sort on distance
# Sort is done in place, so assignment is not required
# however the sort function should return a reference to
# the initial object
result = rna_sort.sortByDistanceFrom(position)
self.assertEqual(result,rna_sort,
"Returned object doesn't match subject")
# Check that each distance is greater than the previous one
last_rna_data = None
for rna_data in rna_sort:
if not last_rna_data:
last_rna_data = rna_data
else:
self.assertTrue((abs(rna_data.getTSS() - position) >=
abs(last_rna_data.getTSS() - position)),
"Sort by distance failed")
