def test_add_sequence(self):
contig = EMBLContig()
contig.header = self.create_blank_bit_of_contig()
contig.features['feature_1'] = self.create_blank_bit_of_contig()
contig.add_sequence('AAAACCCGGTNN')
self.assertIsInstance(contig.sequence, EMBLSequence)
self.assertRaises(ValueError, contig.add_sequence, 'AAAACCCGGTNN')
