def test_make_positive(self):
seq_len = 8
gene = Gene(start=1, end=7, strand='-')
mrna = Mock()
mrna.type = 'mrna'
mrna.make_positive = Mock()
gene.add_child(mrna)
gene.make_positive(seq_len)
self.assertEqual(gene.start, 2)
self.assertEqual(gene.end, 8)
self.assertEqual(gene.strand, '+')
mrna.make_positive.assertCalledWith(seq_len)
