annotate tests/test-bdiff.py @ 48598:a6f16ec07ed7

stream-clone: add a explicit test for format change during stream clone They are different kind of requirements, the one which impact the data storage and are relevant to the files being streamed and the one which does not. For example some requirements are only relevant to the working copy, like sparse, or dirstate-v2. Since they are irrelevant to the content being streamed, they do not prevent the receiving side to use streaming clone and mercurial skip adverting them over the wire and, ideally, within the bundle. In addition, this let the client decide to use whichever format it desire for the part that does not affect the store itself. So the configuration related to these format are used as normal when doing a streaming clone. In practice, the feature was not really tested and is badly broken with bundle-2, since the requirements are not filtered out from the stream bundle. So we start with adding simple tests as a good base before the fix and adjust the feature. Differential Revision: https://phab.mercurial-scm.org/D12029
author Pierre-Yves David <pierre-yves.david@octobus.net>
date Mon, 17 Jan 2022 18:51:47 +0100
parents 2372284d9457
children 6000f5b25c9b
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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 mdiff
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8
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9 class diffreplace(collections.namedtuple('diffreplace', 'start end from_ to')):
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10 def __repr__(self):
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11 return 'diffreplace(%r, %r, %r, %r)' % self
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14 class BdiffTests(unittest.TestCase):
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15 def assert_bdiff_applies(self, a, b):
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16 d = mdiff.textdiff(a, b)
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17 c = a
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18 if d:
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19 c = mdiff.patches(a, [d])
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20 self.assertEqual(
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21 c,
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22 b,
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23 (
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24 "bad diff+patch result from\n %r to\n "
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25 "%r: \nbdiff: %r\npatched: %r" % (a, b, d, c[:200])
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26 ),
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27 )
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29 def assert_bdiff(self, a, b):
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30 self.assert_bdiff_applies(a, b)
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31 self.assert_bdiff_applies(b, a)
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32
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33 def test_bdiff_basic(self):
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34 cases = [
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35 (b"a\nc\n\n\n\n", b"a\nb\n\n\n"),
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36 (b"a\nb\nc\n", b"a\nc\n"),
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37 (b"", b""),
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38 (b"a\nb\nc", b"a\nb\nc"),
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39 (b"a\nb\nc\nd\n", b"a\nd\n"),
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40 (b"a\nb\nc\nd\n", b"a\nc\ne\n"),
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41 (b"a\nb\nc\n", b"a\nc\n"),
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42 (b"a\n", b"c\na\nb\n"),
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43 (b"a\n", b""),
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44 (b"a\n", b"b\nc\n"),
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45 (b"a\n", b"c\na\n"),
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46 (b"", b"adjfkjdjksdhfksj"),
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47 (b"", b"ab"),
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48 (b"", b"abc"),
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49 (b"a", b"a"),
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50 (b"ab", b"ab"),
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51 (b"abc", b"abc"),
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52 (b"a\n", b"a\n"),
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53 (b"a\nb", b"a\nb"),
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54 ]
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55 for a, b in cases:
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56 self.assert_bdiff(a, b)
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57
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58 def showdiff(self, a, b):
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59 bin = mdiff.textdiff(a, b)
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60 pos = 0
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61 q = 0
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62 actions = []
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63 while pos < len(bin):
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64 p1, p2, l = struct.unpack(">lll", bin[pos : pos + 12])
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65 pos += 12
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66 if p1:
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67 actions.append(a[q:p1])
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68 actions.append(diffreplace(p1, p2, a[p1:p2], bin[pos : pos + l]))
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69 pos += l
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70 q = p2
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71 if q < len(a):
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72 actions.append(a[q:])
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73 return actions
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74
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75 def test_issue1295(self):
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76 cases = [
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77 (
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78 b"x\n\nx\n\nx\n\nx\n\nz\n",
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79 b"x\n\nx\n\ny\n\nx\n\nx\n\nz\n",
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80 [
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81 b'x\n\nx\n\n',
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82 diffreplace(6, 6, b'', b'y\n\n'),
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83 b'x\n\nx\n\nz\n',
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84 ],
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85 ),
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86 (
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87 b"x\n\nx\n\nx\n\nx\n\nz\n",
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88 b"x\n\nx\n\ny\n\nx\n\ny\n\nx\n\nz\n",
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89 [
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90 b'x\n\nx\n\n',
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91 diffreplace(6, 6, b'', b'y\n\n'),
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92 b'x\n\n',
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93 diffreplace(9, 9, b'', b'y\n\n'),
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94 b'x\n\nz\n',
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95 ],
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96 ),
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97 ]
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98 for old, new, want in cases:
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99 self.assertEqual(self.showdiff(old, new), want)
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100
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101 def test_issue1295_varies_on_pure(self):
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102 # we should pick up abbbc. rather than bc.de as the longest match
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103 got = self.showdiff(
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104 b"a\nb\nb\nb\nc\n.\nd\ne\n.\nf\n",
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105 b"a\nb\nb\na\nb\nb\nb\nc\n.\nb\nc\n.\nd\ne\nf\n",
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106 )
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107 want_c = [
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108 b'a\nb\nb\n',
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109 diffreplace(6, 6, b'', b'a\nb\nb\nb\nc\n.\n'),
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110 b'b\nc\n.\nd\ne\n',
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111 diffreplace(16, 18, b'.\n', b''),
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112 b'f\n',
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113 ]
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114 want_pure = [
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115 diffreplace(0, 0, b'', b'a\nb\nb\n'),
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116 b'a\nb\nb\nb\nc\n.\n',
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117 diffreplace(12, 12, b'', b'b\nc\n.\n'),
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118 b'd\ne\n',
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119 diffreplace(16, 18, b'.\n', b''),
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120 b'f\n',
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121 ]
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122 self.assertTrue(
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123 got in (want_c, want_pure),
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124 'got: %r, wanted either %r or %r' % (got, want_c, want_pure),
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125 )
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126
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127 def test_fixws(self):
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128 cases = [
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129 (b" \ta\r b\t\n", b"ab\n", 1),
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130 (b" \ta\r b\t\n", b" a b\n", 0),
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131 (b"", b"", 1),
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132 (b"", b"", 0),
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133 ]
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134 for a, b, allws in cases:
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135 c = mdiff.fixws(a, allws)
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136 self.assertEqual(
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137 c, b, 'fixws(%r) want %r got %r (allws=%r)' % (a, b, c, allws)
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138 )
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139
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140 def test_nice_diff_for_trivial_change(self):
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141 self.assertEqual(
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142 self.showdiff(
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143 b''.join(b'<%d\n-\n' % i for i in range(5)),
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144 b''.join(b'>%d\n-\n' % i for i in range(5)),
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145 ),
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146 [
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147 diffreplace(0, 3, b'<0\n', b'>0\n'),
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148 b'-\n',
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149 diffreplace(5, 8, b'<1\n', b'>1\n'),
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150 b'-\n',
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151 diffreplace(10, 13, b'<2\n', b'>2\n'),
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152 b'-\n',
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153 diffreplace(15, 18, b'<3\n', b'>3\n'),
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154 b'-\n',
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155 diffreplace(20, 23, b'<4\n', b'>4\n'),
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156 b'-\n',
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157 ],
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158 )
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159
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160 def test_prefer_appending(self):
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161 # 1 line to 3 lines
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162 self.assertEqual(
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163 self.showdiff(b'a\n', b'a\n' * 3),
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164 [b'a\n', diffreplace(2, 2, b'', b'a\na\n')],
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165 )
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166 # 1 line to 5 lines
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167 self.assertEqual(
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168 self.showdiff(b'a\n', b'a\n' * 5),
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169 [b'a\n', diffreplace(2, 2, b'', b'a\na\na\na\n')],
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170 )
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171
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172 def test_prefer_removing_trailing(self):
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173 # 3 lines to 1 line
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174 self.assertEqual(
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175 self.showdiff(b'a\n' * 3, b'a\n'),
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176 [b'a\n', diffreplace(2, 6, b'a\na\n', b'')],
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177 )
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178 # 5 lines to 1 line
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179 self.assertEqual(
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180 self.showdiff(b'a\n' * 5, b'a\n'),
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181 [b'a\n', diffreplace(2, 10, b'a\na\na\na\n', b'')],
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182 )
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183
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184
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185 if __name__ == '__main__':
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186 import silenttestrunner
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187
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188 silenttestrunner.main(__name__)