Mercurial > hg
annotate tests/test-bdiff.py @ 46858:85e3a630cad9
revlog: move the details of revlog "v2" index inside revlog.utils.constants
the revlog module is quite large and this kind of format information would handy
for other module. So let us start to gather this information about the format in
a more appropriate place.
We update various reference to this information to use the new "source of truth"
in the process.
Differential Revision: https://phab.mercurial-scm.org/D10305
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Mon, 05 Apr 2021 12:21:12 +0200 |
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children | 6000f5b25c9b |
rev | line source |
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1 from __future__ import absolute_import, print_function |
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2 import collections |
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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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12 |
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13 |
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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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28 |
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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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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__) |