Mercurial > public > mercurial-scm > hg-stable

annotate tests/test-bdiff.py @ 39883:3e896b51aa5d

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storageutil: move metadata parsing and packing from revlog (API) Parsing and writing of revision text metadata is likely identical across storage backends. Let's move the code out of revlog so we don't need to import the revlog module in order to use it. Differential Revision: https://phab.mercurial-scm.org/D4754
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 24 Sep 2018 14:31:31 -0700
parents e961f18a0094
children 2372284d9457
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 (b"a\nc\n\n\n\n", b"a\nb\n\n\n"),
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33 (b"a\nb\nc\n", b"a\nc\n"),
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34 (b"", b""),
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35 (b"a\nb\nc", b"a\nb\nc"),
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36 (b"a\nb\nc\nd\n", b"a\nd\n"),
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37 (b"a\nb\nc\nd\n", b"a\nc\ne\n"),
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38 (b"a\nb\nc\n", b"a\nc\n"),
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39 (b"a\n", b"c\na\nb\n"),
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40 (b"a\n", b""),
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41 (b"a\n", b"b\nc\n"),
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42 (b"a\n", b"c\na\n"),
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43 (b"", b"adjfkjdjksdhfksj"),
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44 (b"", b"ab"),
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45 (b"", b"abc"),
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46 (b"a", b"a"),
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47 (b"ab", b"ab"),
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48 (b"abc", b"abc"),
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49 (b"a\n", b"a\n"),
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50 (b"a\nb", b"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 (b"x\n\nx\n\nx\n\nx\n\nz\n", b"x\n\nx\n\ny\n\nx\n\nx\n\nz\n",
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75 [b'x\n\nx\n\n',
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76 diffreplace(6, 6, b'', b'y\n\n'),
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77 b'x\n\nx\n\nz\n']),
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78 (b"x\n\nx\n\nx\n\nx\n\nz\n", b"x\n\nx\n\ny\n\nx\n\ny\n\nx\n\nz\n",
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79 [b'x\n\nx\n\n',
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80 diffreplace(6, 6, b'', b'y\n\n'),
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81 b'x\n\n',
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82 diffreplace(9, 9, b'', b'y\n\n'),
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83 b'x\n\nz\n']),
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84 ]
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85 for old, new, want in cases:
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86 self.assertEqual(self.showdiff(old, new), want)
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87
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88 def test_issue1295_varies_on_pure(self):
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89 # we should pick up abbbc. rather than bc.de as the longest match
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90 got = self.showdiff(b"a\nb\nb\nb\nc\n.\nd\ne\n.\nf\n",
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91 b"a\nb\nb\na\nb\nb\nb\nc\n.\nb\nc\n.\nd\ne\nf\n")
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92 want_c = [b'a\nb\nb\n',
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93 diffreplace(6, 6, b'', b'a\nb\nb\nb\nc\n.\n'),
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94 b'b\nc\n.\nd\ne\n',
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95 diffreplace(16, 18, b'.\n', b''),
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96 b'f\n']
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97 want_pure = [diffreplace(0, 0, b'', b'a\nb\nb\n'),
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98 b'a\nb\nb\nb\nc\n.\n',
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99 diffreplace(12, 12, b'', b'b\nc\n.\n'),
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100 b'd\ne\n',
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101 diffreplace(16, 18, b'.\n', b''), b'f\n']
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102 self.assertTrue(got in (want_c, want_pure),
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103 'got: %r, wanted either %r or %r' % (
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104 got, want_c, want_pure))
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105
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106 def test_fixws(self):
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107 cases = [
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108 (b" \ta\r b\t\n", b"ab\n", 1),
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109 (b" \ta\r b\t\n", b" a b\n", 0),
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110 (b"", b"", 1),
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111 (b"", b"", 0),
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112 ]
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113 for a, b, allws in cases:
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114 c = mdiff.fixws(a, allws)
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115 self.assertEqual(
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116 c, b, 'fixws(%r) want %r got %r (allws=%r)' % (a, b, c, allws))
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117
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118 def test_nice_diff_for_trivial_change(self):
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119 self.assertEqual(self.showdiff(
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120 b''.join(b'<%d\n-\n' % i for i in range(5)),
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121 b''.join(b'>%d\n-\n' % i for i in range(5))),
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122 [diffreplace(0, 3, b'<0\n', b'>0\n'),
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123 b'-\n',
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124 diffreplace(5, 8, b'<1\n', b'>1\n'),
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125 b'-\n',
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126 diffreplace(10, 13, b'<2\n', b'>2\n'),
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127 b'-\n',
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128 diffreplace(15, 18, b'<3\n', b'>3\n'),
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129 b'-\n',
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130 diffreplace(20, 23, b'<4\n', b'>4\n'),
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131 b'-\n'])
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132
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133 def test_prefer_appending(self):
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134 # 1 line to 3 lines
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135 self.assertEqual(self.showdiff(b'a\n', b'a\n' * 3),
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136 [b'a\n', diffreplace(2, 2, b'', b'a\na\n')])
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137 # 1 line to 5 lines
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138 self.assertEqual(self.showdiff(b'a\n', b'a\n' * 5),
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139 [b'a\n', diffreplace(2, 2, b'', b'a\na\na\na\n')])
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140
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141 def test_prefer_removing_trailing(self):
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142 # 3 lines to 1 line
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143 self.assertEqual(self.showdiff(b'a\n' * 3, b'a\n'),
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144 [b'a\n', diffreplace(2, 6, b'a\na\n', b'')])
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145 # 5 lines to 1 line
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146 self.assertEqual(self.showdiff(b'a\n' * 5, b'a\n'),
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147 [b'a\n', diffreplace(2, 10, b'a\na\na\na\n', b'')])
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148
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149 if __name__ == '__main__':
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150 import silenttestrunner
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151 silenttestrunner.main(__name__)