annotate tests/test-bdiff.py @ 33648:47ea28293d30 stable

tests: show cache of audited paths is never invalidated
author Yuya Nishihara <yuya@tcha.org>
date Tue, 01 Aug 2017 21:03:25 +0900
parents 0c73634d0570
children e05d7c71f209
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 from __future__ import absolute_import, print_function
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2 import collections
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3 import struct
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4 import unittest
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5
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6 from mercurial import (
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7 mdiff,
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8 )
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9
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10 class diffreplace(
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11 collections.namedtuple('diffreplace', 'start end from_ to')):
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12 def __repr__(self):
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13 return 'diffreplace(%r, %r, %r, %r)' % self
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14
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15 class BdiffTests(unittest.TestCase):
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16
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17 def assert_bdiff_applies(self, a, b):
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18 d = mdiff.textdiff(a, b)
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19 c = a
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20 if d:
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21 c = mdiff.patches(a, [d])
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22 self.assertEqual(
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23 c, b, ("bad diff+patch result from\n %r to\n "
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24 "%r: \nbdiff: %r\npatched: %r" % (a, b, d, c[:200])))
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25
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26 def assert_bdiff(self, a, b):
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27 self.assert_bdiff_applies(a, b)
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28 self.assert_bdiff_applies(b, a)
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29
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30 def test_bdiff_basic(self):
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31 cases = [
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32 ("a\nc\n\n\n\n", "a\nb\n\n\n"),
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33 ("a\nb\nc\n", "a\nc\n"),
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34 ("", ""),
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35 ("a\nb\nc", "a\nb\nc"),
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36 ("a\nb\nc\nd\n", "a\nd\n"),
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37 ("a\nb\nc\nd\n", "a\nc\ne\n"),
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38 ("a\nb\nc\n", "a\nc\n"),
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39 ("a\n", "c\na\nb\n"),
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40 ("a\n", ""),
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41 ("a\n", "b\nc\n"),
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42 ("a\n", "c\na\n"),
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43 ("", "adjfkjdjksdhfksj"),
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44 ("", "ab"),
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45 ("", "abc"),
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46 ("a", "a"),
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47 ("ab", "ab"),
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48 ("abc", "abc"),
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49 ("a\n", "a\n"),
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50 ("a\nb", "a\nb"),
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51 ]
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52 for a, b in cases:
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53 self.assert_bdiff(a, b)
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54
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55 def showdiff(self, a, b):
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56 bin = mdiff.textdiff(a, b)
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57 pos = 0
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58 q = 0
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59 actions = []
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60 while pos < len(bin):
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61 p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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62 pos += 12
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63 if p1:
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64 actions.append(a[q:p1])
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65 actions.append(diffreplace(p1, p2, a[p1:p2], bin[pos:pos + l]))
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66 pos += l
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67 q = p2
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68 if q < len(a):
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69 actions.append(a[q:])
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70 return actions
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71
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72 def test_issue1295(self):
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73 cases = [
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74 ("x\n\nx\n\nx\n\nx\n\nz\n", "x\n\nx\n\ny\n\nx\n\nx\n\nz\n",
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75 ['x\n\nx\n\n', diffreplace(6, 6, '', 'y\n\n'), 'x\n\nx\n\nz\n']),
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76 ("x\n\nx\n\nx\n\nx\n\nz\n", "x\n\nx\n\ny\n\nx\n\ny\n\nx\n\nz\n",
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77 ['x\n\nx\n\n',
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78 diffreplace(6, 6, '', 'y\n\n'),
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79 'x\n\n',
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80 diffreplace(9, 9, '', 'y\n\n'),
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81 'x\n\nz\n']),
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82 ]
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83 for old, new, want in cases:
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84 self.assertEqual(self.showdiff(old, new), want)
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85
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86 def test_issue1295_varies_on_pure(self):
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87 # we should pick up abbbc. rather than bc.de as the longest match
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88 got = self.showdiff("a\nb\nb\nb\nc\n.\nd\ne\n.\nf\n",
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89 "a\nb\nb\na\nb\nb\nb\nc\n.\nb\nc\n.\nd\ne\nf\n")
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90 want_c = ['a\nb\nb\n',
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91 diffreplace(6, 6, '', 'a\nb\nb\nb\nc\n.\n'),
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92 'b\nc\n.\nd\ne\n',
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93 diffreplace(16, 18, '.\n', ''),
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94 'f\n']
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95 want_pure = [diffreplace(0, 0, '', 'a\nb\nb\n'),
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96 'a\nb\nb\nb\nc\n.\n',
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97 diffreplace(12, 12, '', 'b\nc\n.\n'),
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98 'd\ne\n',
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99 diffreplace(16, 18, '.\n', ''), 'f\n']
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100 self.assert_(got in (want_c, want_pure),
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101 'got: %r, wanted either %r or %r' % (
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102 got, want_c, want_pure))
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103
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104 def test_fixws(self):
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105 cases = [
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106 (" \ta\r b\t\n", "ab\n", 1),
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107 (" \ta\r b\t\n", " a b\n", 0),
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108 ("", "", 1),
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109 ("", "", 0),
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110 ]
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111 for a, b, allws in cases:
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112 c = mdiff.fixws(a, allws)
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113 self.assertEqual(
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114 c, b, 'fixws(%r) want %r got %r (allws=%r)' % (a, b, c, allws))
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115
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116 def test_nice_diff_for_trivial_change(self):
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117 self.assertEqual(self.showdiff(
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118 ''.join('<%s\n-\n' % i for i in range(5)),
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119 ''.join('>%s\n-\n' % i for i in range(5))),
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120 [diffreplace(0, 3, '<0\n', '>0\n'),
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121 '-\n',
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122 diffreplace(5, 8, '<1\n', '>1\n'),
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123 '-\n',
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124 diffreplace(10, 13, '<2\n', '>2\n'),
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125 '-\n',
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126 diffreplace(15, 18, '<3\n', '>3\n'),
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127 '-\n',
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128 diffreplace(20, 23, '<4\n', '>4\n'),
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129 '-\n'])
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130
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131 def test_prefer_appending(self):
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132 # 1 line to 3 lines
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133 self.assertEqual(self.showdiff('a\n', 'a\n' * 3),
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134 ['a\n', diffreplace(2, 2, '', 'a\na\n')])
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135 # 1 line to 5 lines
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136 self.assertEqual(self.showdiff('a\n', 'a\n' * 5),
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137 ['a\n', diffreplace(2, 2, '', 'a\na\na\na\n')])
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138
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139 def test_prefer_removing_trailing(self):
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140 # 3 lines to 1 line
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141 self.assertEqual(self.showdiff('a\n' * 3, 'a\n'),
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142 ['a\n', diffreplace(2, 6, 'a\na\n', '')])
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143 # 5 lines to 1 line
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144 self.assertEqual(self.showdiff('a\n' * 5, 'a\n'),
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145 ['a\n', diffreplace(2, 10, 'a\na\na\na\n', '')])
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146
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147 if __name__ == '__main__':
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148 import silenttestrunner
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149 silenttestrunner.main(__name__)