def test_no_lcs(self):
seq1 = 'abc'
seq2 = 'xyz'
expected_lcs = []
lcs_gen = diff._backtrack(diff._build_lcs_matrix(seq1, seq2))
self.assertEqual(
expected_lcs,
[i for i in reversed([x for x in lcs_gen])])
def test_lcs_is_not_aligned(self):
seq1 = '---a-bc'
seq2 = 'ab.c..'
expected_lcs = [(3, 0), (5, 1), (6, 3)]
lcs_gen = diff._backtrack(diff._build_lcs_matrix(seq1, seq2))
self.assertEqual(
expected_lcs,
[i for i in reversed([x for x in lcs_gen])])
def test_lcs_is_not_contiguous(self):
seq1 = '-a-b-c-'
seq2 = '.a.b.c.'
expected_lcs = [(1, 1), (3, 3), (5, 5)]
lcs_gen = diff._backtrack(diff._build_lcs_matrix(seq1, seq2))
self.assertEqual(
expected_lcs,
[i for i in reversed([x for x in lcs_gen])])
def test_more_than_one_possible_lcs(self):
'''When there is a choice only one value should be returned'''
# IMPORTANT if we swap in a different lcs function this test may have
# to change because it may choose a different one.
seq1 = 'aabb'
seq2 = 'bbaa'
expected_lcs = [(0, 2), (1, 3)]
lcs_gen = diff._backtrack(diff._build_lcs_matrix(seq1, seq2))
self.assertEqual(
expected_lcs,
[i for i in reversed([x for x in lcs_gen])])