annotate tests/test-bdiff.py @ 50824:489268c8ee7e

cmdutil: migrate `opts` on commitstatus() to native kwargs
author Matt Harbison <matt_harbison@yahoo.com>
date Sat, 19 Aug 2023 23:06:40 -0400
parents 6000f5b25c9b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import collections
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2 import struct
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3 import unittest
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4
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5 from mercurial import mdiff
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6
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7
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8 class diffreplace(collections.namedtuple('diffreplace', 'start end from_ to')):
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9 def __repr__(self):
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10 return 'diffreplace(%r, %r, %r, %r)' % self
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13 class BdiffTests(unittest.TestCase):
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14 def assert_bdiff_applies(self, a, b):
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15 d = mdiff.textdiff(a, b)
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16 c = a
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17 if d:
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18 c = mdiff.patches(a, [d])
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19 self.assertEqual(
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20 c,
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21 b,
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22 (
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23 "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 )
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27
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28 def assert_bdiff(self, a, b):
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29 self.assert_bdiff_applies(a, b)
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30 self.assert_bdiff_applies(b, a)
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31
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32 def test_bdiff_basic(self):
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33 cases = [
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34 (b"a\nc\n\n\n\n", b"a\nb\n\n\n"),
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35 (b"a\nb\nc\n", b"a\nc\n"),
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36 (b"", b""),
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37 (b"a\nb\nc", b"a\nb\nc"),
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38 (b"a\nb\nc\nd\n", b"a\nd\n"),
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39 (b"a\nb\nc\nd\n", b"a\nc\ne\n"),
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40 (b"a\nb\nc\n", b"a\nc\n"),
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41 (b"a\n", b"c\na\nb\n"),
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42 (b"a\n", b""),
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43 (b"a\n", b"b\nc\n"),
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44 (b"a\n", b"c\na\n"),
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45 (b"", b"adjfkjdjksdhfksj"),
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46 (b"", b"ab"),
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47 (b"", b"abc"),
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48 (b"a", b"a"),
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49 (b"ab", b"ab"),
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50 (b"abc", b"abc"),
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51 (b"a\n", b"a\n"),
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52 (b"a\nb", b"a\nb"),
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53 ]
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54 for a, b in cases:
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55 self.assert_bdiff(a, b)
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57 def showdiff(self, a, b):
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58 bin = mdiff.textdiff(a, b)
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59 pos = 0
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60 q = 0
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61 actions = []
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62 while pos < len(bin):
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63 p1, p2, l = struct.unpack(">lll", bin[pos : pos + 12])
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64 pos += 12
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65 if p1:
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66 actions.append(a[q:p1])
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67 actions.append(diffreplace(p1, p2, a[p1:p2], bin[pos : pos + l]))
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68 pos += l
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69 q = p2
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70 if q < len(a):
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71 actions.append(a[q:])
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72 return actions
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73
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74 def test_issue1295(self):
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75 cases = [
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76 (
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77 b"x\n\nx\n\nx\n\nx\n\nz\n",
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78 b"x\n\nx\n\ny\n\nx\n\nx\n\nz\n",
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79 [
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80 b'x\n\nx\n\n',
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81 diffreplace(6, 6, b'', b'y\n\n'),
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82 b'x\n\nx\n\nz\n',
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83 ],
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84 ),
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85 (
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86 b"x\n\nx\n\nx\n\nx\n\nz\n",
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87 b"x\n\nx\n\ny\n\nx\n\ny\n\nx\n\nz\n",
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88 [
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89 b'x\n\nx\n\n',
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90 diffreplace(6, 6, b'', b'y\n\n'),
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91 b'x\n\n',
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92 diffreplace(9, 9, b'', b'y\n\n'),
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93 b'x\n\nz\n',
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94 ],
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95 ),
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96 ]
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97 for old, new, want in cases:
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98 self.assertEqual(self.showdiff(old, new), want)
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99
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100 def test_issue1295_varies_on_pure(self):
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101 # we should pick up abbbc. rather than bc.de as the longest match
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102 got = self.showdiff(
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103 b"a\nb\nb\nb\nc\n.\nd\ne\n.\nf\n",
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104 b"a\nb\nb\na\nb\nb\nb\nc\n.\nb\nc\n.\nd\ne\nf\n",
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105 )
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106 want_c = [
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107 b'a\nb\nb\n',
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108 diffreplace(6, 6, b'', b'a\nb\nb\nb\nc\n.\n'),
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109 b'b\nc\n.\nd\ne\n',
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110 diffreplace(16, 18, b'.\n', b''),
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111 b'f\n',
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112 ]
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113 want_pure = [
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114 diffreplace(0, 0, b'', b'a\nb\nb\n'),
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115 b'a\nb\nb\nb\nc\n.\n',
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116 diffreplace(12, 12, b'', b'b\nc\n.\n'),
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117 b'd\ne\n',
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118 diffreplace(16, 18, b'.\n', b''),
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119 b'f\n',
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120 ]
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121 self.assertTrue(
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122 got in (want_c, want_pure),
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123 'got: %r, wanted either %r or %r' % (got, want_c, want_pure),
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124 )
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125
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126 def test_fixws(self):
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127 cases = [
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128 (b" \ta\r b\t\n", b"ab\n", 1),
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129 (b" \ta\r b\t\n", b" a b\n", 0),
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130 (b"", b"", 1),
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131 (b"", b"", 0),
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132 ]
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133 for a, b, allws in cases:
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134 c = mdiff.fixws(a, allws)
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135 self.assertEqual(
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136 c, b, 'fixws(%r) want %r got %r (allws=%r)' % (a, b, c, allws)
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137 )
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138
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139 def test_nice_diff_for_trivial_change(self):
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140 self.assertEqual(
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141 self.showdiff(
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142 b''.join(b'<%d\n-\n' % i for i in range(5)),
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143 b''.join(b'>%d\n-\n' % i for i in range(5)),
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144 ),
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145 [
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146 diffreplace(0, 3, b'<0\n', b'>0\n'),
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147 b'-\n',
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148 diffreplace(5, 8, b'<1\n', b'>1\n'),
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149 b'-\n',
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150 diffreplace(10, 13, b'<2\n', b'>2\n'),
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151 b'-\n',
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152 diffreplace(15, 18, b'<3\n', b'>3\n'),
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153 b'-\n',
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154 diffreplace(20, 23, b'<4\n', b'>4\n'),
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155 b'-\n',
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156 ],
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157 )
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158
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159 def test_prefer_appending(self):
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160 # 1 line to 3 lines
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161 self.assertEqual(
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162 self.showdiff(b'a\n', b'a\n' * 3),
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163 [b'a\n', diffreplace(2, 2, b'', b'a\na\n')],
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164 )
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165 # 1 line to 5 lines
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166 self.assertEqual(
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167 self.showdiff(b'a\n', b'a\n' * 5),
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168 [b'a\n', diffreplace(2, 2, b'', b'a\na\na\na\n')],
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169 )
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170
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171 def test_prefer_removing_trailing(self):
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172 # 3 lines to 1 line
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173 self.assertEqual(
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174 self.showdiff(b'a\n' * 3, b'a\n'),
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175 [b'a\n', diffreplace(2, 6, b'a\na\n', b'')],
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176 )
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177 # 5 lines to 1 line
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178 self.assertEqual(
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179 self.showdiff(b'a\n' * 5, b'a\n'),
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180 [b'a\n', diffreplace(2, 10, b'a\na\na\na\n', b'')],
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181 )
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182
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183
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184 if __name__ == '__main__':
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185 import silenttestrunner
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186
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187 silenttestrunner.main(__name__)