Alexander
8d2f2fa11c
difflib's SequenceMatcher underrates adjacent transpositions, so the flagship examples (gti->git 0.667, greo->grep 0.75, psuh->push 0.75) fell below the 0.8 ratio gates and were declined. Per the plan amendment, the token and candidate gates in the history resolver, guess_from_path and the help resolver additionally accept a first-char-equal single edit (one substitution, insertion, deletion or adjacent transposition; new thefuck/typo.py), with the ratio cutoffs, the exact-one-candidate rule and the 0.79 boundary (edit distance >= 2) unchanged.
85 lines
2.6 KiB
Python
85 lines
2.6 KiB
Python
from thefuck.typo import single_edit
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class TestSubstitution(object):
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def test_single_substitution(self):
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assert single_edit('greo', 'grep')
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def test_single_substitution_one_char_words(self):
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assert single_edit('a', 'b')
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class TestTransposition(object):
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def test_adjacent_transposition_gti(self):
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assert single_edit('gti', 'git')
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def test_adjacent_transposition_psuh(self):
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assert single_edit('psuh', 'push')
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def test_adjacent_transposition_bulid(self):
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assert single_edit('bulid', 'build')
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def test_transposition_is_symmetric(self):
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assert single_edit('git', 'gti')
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def test_non_adjacent_swap_is_two_edits(self):
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# Swapping two NON-adjacent characters takes two moves:
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# abcd -> badc diverges at every position.
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assert not single_edit('abcd', 'badc')
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def test_two_differing_positions_not_crossed(self):
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# Two substitutions shaped like a swap but with distinct
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# characters are two edits, not one transposition.
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assert not single_edit('ab', 'cd')
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class TestInsertionAndDeletion(object):
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def test_single_insertion(self):
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assert single_edit('clea', 'clear')
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def test_single_deletion(self):
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assert single_edit('clear', 'clea')
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def test_insertion_in_the_middle(self):
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assert single_edit('gt', 'git')
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def test_two_insertions(self):
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assert not single_edit('cl', 'clear')
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class TestBoundaries(object):
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def test_equal_strings(self):
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assert not single_edit('git', 'git')
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def test_empty_strings(self):
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assert not single_edit('', '')
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def test_empty_to_single_char(self):
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assert single_edit('', 'a')
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def test_single_char_to_empty(self):
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assert single_edit('a', '')
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def test_empty_to_two_chars(self):
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assert not single_edit('', 'ab')
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def test_length_difference_over_one(self):
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assert not single_edit('g', 'git')
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def test_shifted_words_are_two_edits(self):
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# abc -> bcd keeps no common alignment: a deletion plus an
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# insertion, i.e. two edits.
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assert not single_edit('abc', 'bcd')
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def test_two_substitutions(self):
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# Adjacent but not crossed: two substitutions, not one
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# transposition.
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assert not single_edit('abcd', 'abxy')
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def test_help_flag_boundary_pair(self):
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# The pair the history-resolver boundary test pins: under the
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# 0.8 ratio cutoff (0.769) AND not a single edit, so the
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# amended gate still declines it.
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assert not single_edit('--ignore-whitespaces',
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'--ignore-all-spaces')
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