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Contents
"""Tests for the nucleotide-count exercise
Implementation note:
The count function must raise a ValueError with a meaningful error message
in case of a bad argument.
"""
import unittest
from nucleotide_count import count, nucleotide_counts
class DNATest(unittest.TestCase):
def test_empty_dna_string_has_no_adenosine(self):
self.assertEqual(count('', 'A'), 0)
def test_empty_dna_string_has_no_nucleotides(self):
expected = {'A': 0, 'T': 0, 'C': 0, 'G': 0}
self.assertEqual(nucleotide_counts(""), expected)
def test_repetitive_cytidine_gets_counted(self):
self.assertEqual(count('CCCCC', 'C'), 5)
def test_repetitive_sequence_has_only_guanosine(self):
expected = {'A': 0, 'T': 0, 'C': 0, 'G': 8}
self.assertEqual(nucleotide_counts('GGGGGGGG'), expected)
def test_counts_only_thymidine(self):
self.assertEqual(count('GGGGGTAACCCGG', 'T'), 1)
def test_validates_nucleotides(self):
with self.assertRaisesWithMessage(ValueError):
count("GACT", 'X')
def test_counts_all_nucleotides(self):
dna = ('AGCTTTTCATTCTGACTGCAACGGGCAATATGTCT'
'CTGTGTGGATTAAAAAAAGAGTGTCTGATAGCAGC')
expected = {'A': 20, 'T': 21, 'G': 17, 'C': 12}
self.assertEqual(nucleotide_counts(dna), expected)
# Utility functions
def setUp(self):
try:
self.assertRaisesRegex
except AttributeError:
self.assertRaisesRegex = self.assertRaisesRegexp
def assertRaisesWithMessage(self, exception):
return self.assertRaisesRegex(exception, r".+")
if __name__ == '__main__':
unittest.main()
Version data entries
64 entries across 64 versions & 1 rubygems