Mercurial > hg
annotate tests/test-rust-ancestor.py @ 50979:4c5f6e95df84
rust: make `Revision` a newtype
This change is the one we've been building towards during this series.
The aim is to make `Revision` mean more than a simple integer, holding
the information that it is valid for a given revlog index.
While this still allows for programmer error, since creating a revision
directly and querying a different index with a "checked" revision are
still possible, the friction created by the newtype will hopefully make
us think twice about which type to use.
Enough of the Rust ecosystem relies on the newtype pattern to be
efficiently optimized away (even compiler in codegen testsĀ¹), so I'm not
worried about this being a fundamental problem.
[1] https://github.com/rust-lang/rust/blob/7a70647f195f6b0a0f1ebd72b1542ba91a32f43a/tests/codegen/vec-in-place.rs#L47
author | Raphaël Gomès <rgomes@octobus.net> |
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date | Fri, 18 Aug 2023 14:34:29 +0200 |
parents | 6000f5b25c9b |
children | 7eea2e4109ae |
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1 import sys |
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2 import unittest |
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3 |
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4 from mercurial.node import wdirrev |
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6 from mercurial.testing import revlog as revlogtesting |
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7 |
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8 try: |
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9 from mercurial import rustext |
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10 |
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11 rustext.__name__ # trigger immediate actual import |
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12 except ImportError: |
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13 rustext = None |
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14 else: |
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15 # this would fail already without appropriate ancestor.__package__ |
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16 from mercurial.rustext.ancestor import ( |
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17 AncestorsIterator, |
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18 LazyAncestors, |
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19 MissingAncestors, |
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20 ) |
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21 from mercurial.rustext import dagop |
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22 |
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23 try: |
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24 from mercurial.cext import parsers as cparsers |
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25 except ImportError: |
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26 cparsers = None |
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27 |
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28 |
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29 @unittest.skipIf( |
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30 rustext is None, |
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31 'The Rust version of the "ancestor" module is not available. It is needed' |
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32 ' for this test.', |
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33 ) |
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34 @unittest.skipIf( |
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35 rustext is None, |
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36 'The Rust or C version of the "parsers" module, which the "ancestor" module' |
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37 ' relies on, is not available.', |
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38 ) |
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39 class rustancestorstest(revlogtesting.RevlogBasedTestBase): |
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40 """Test the correctness of binding to Rust code. |
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41 |
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42 This test is merely for the binding to Rust itself: extraction of |
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43 Python variable, giving back the results etc. |
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44 |
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45 It is not meant to test the algorithmic correctness of the operations |
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46 on ancestors it provides. Hence the very simple embedded index data is |
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47 good enough. |
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48 |
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49 Algorithmic correctness is asserted by the Rust unit tests. |
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50 """ |
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51 |
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52 def testiteratorrevlist(self): |
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53 idx = self.parseindex() |
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54 # checking test assumption about the index binary data: |
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55 self.assertEqual( |
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56 {i: (r[5], r[6]) for i, r in enumerate(idx)}, |
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57 {0: (-1, -1), 1: (0, -1), 2: (1, -1), 3: (2, -1)}, |
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58 ) |
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59 ait = AncestorsIterator(idx, [3], 0, True) |
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60 self.assertEqual([r for r in ait], [3, 2, 1, 0]) |
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61 |
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62 ait = AncestorsIterator(idx, [3], 0, False) |
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63 self.assertEqual([r for r in ait], [2, 1, 0]) |
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64 |
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65 def testlazyancestors(self): |
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66 idx = self.parseindex() |
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67 start_count = sys.getrefcount(idx) # should be 2 (see Python doc) |
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68 self.assertEqual( |
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69 {i: (r[5], r[6]) for i, r in enumerate(idx)}, |
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70 {0: (-1, -1), 1: (0, -1), 2: (1, -1), 3: (2, -1)}, |
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71 ) |
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72 lazy = LazyAncestors(idx, [3], 0, True) |
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73 # we have two more references to the index: |
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74 # - in its inner iterator for __contains__ and __bool__ |
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75 # - in the LazyAncestors instance itself (to spawn new iterators) |
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76 self.assertEqual(sys.getrefcount(idx), start_count + 2) |
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77 |
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78 self.assertTrue(2 in lazy) |
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79 self.assertTrue(bool(lazy)) |
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80 self.assertEqual(list(lazy), [3, 2, 1, 0]) |
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81 # a second time to validate that we spawn new iterators |
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82 self.assertEqual(list(lazy), [3, 2, 1, 0]) |
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83 |
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84 # now let's watch the refcounts closer |
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85 ait = iter(lazy) |
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86 self.assertEqual(sys.getrefcount(idx), start_count + 3) |
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87 del ait |
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88 self.assertEqual(sys.getrefcount(idx), start_count + 2) |
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89 del lazy |
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90 self.assertEqual(sys.getrefcount(idx), start_count) |
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91 |
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92 # let's check bool for an empty one |
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93 self.assertFalse(LazyAncestors(idx, [0], 0, False)) |
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94 |
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95 def testmissingancestors(self): |
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96 idx = self.parseindex() |
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97 missanc = MissingAncestors(idx, [1]) |
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98 self.assertTrue(missanc.hasbases()) |
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99 self.assertEqual(missanc.missingancestors([3]), [2, 3]) |
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100 missanc.addbases({2}) |
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101 self.assertEqual(missanc.bases(), {1, 2}) |
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102 self.assertEqual(missanc.missingancestors([3]), [3]) |
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103 self.assertEqual(missanc.basesheads(), {2}) |
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104 |
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105 def testmissingancestorsremove(self): |
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106 idx = self.parseindex() |
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107 missanc = MissingAncestors(idx, [1]) |
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108 revs = {0, 1, 2, 3} |
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109 missanc.removeancestorsfrom(revs) |
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110 self.assertEqual(revs, {2, 3}) |
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111 |
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112 def testrefcount(self): |
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113 idx = self.parseindex() |
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114 start_count = sys.getrefcount(idx) |
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115 |
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116 # refcount increases upon iterator init... |
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117 ait = AncestorsIterator(idx, [3], 0, True) |
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118 self.assertEqual(sys.getrefcount(idx), start_count + 1) |
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119 self.assertEqual(next(ait), 3) |
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120 |
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121 # and decreases once the iterator is removed |
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122 del ait |
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123 self.assertEqual(sys.getrefcount(idx), start_count) |
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124 |
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125 # and removing ref to the index after iterator init is no issue |
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126 ait = AncestorsIterator(idx, [3], 0, True) |
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127 del idx |
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128 self.assertEqual(list(ait), [3, 2, 1, 0]) |
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129 |
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130 def testgrapherror(self): |
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131 data = ( |
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132 revlogtesting.data_non_inlined[: 64 + 27] |
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133 + b'\xf2' |
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134 + revlogtesting.data_non_inlined[64 + 28 :] |
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135 ) |
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136 idx = cparsers.parse_index2(data, False)[0] |
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137 with self.assertRaises(rustext.GraphError) as arc: |
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138 AncestorsIterator(idx, [1], -1, False) |
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139 exc = arc.exception |
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140 self.assertIsInstance(exc, ValueError) |
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141 # rust-cpython issues appropriate str instances for Python 2 and 3 |
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142 self.assertEqual(exc.args, ('ParentOutOfRange', 1)) |
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143 |
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144 def testwdirunsupported(self): |
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145 # trying to access ancestors of the working directory raises |
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146 idx = self.parseindex() |
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147 with self.assertRaises(rustext.GraphError) as arc: |
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148 list(AncestorsIterator(idx, [wdirrev], -1, False)) |
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149 |
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150 exc = arc.exception |
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151 self.assertIsInstance(exc, ValueError) |
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152 # rust-cpython issues appropriate str instances for Python 2 and 3 |
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153 self.assertEqual(exc.args, ('InvalidRevision', wdirrev)) |
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154 |
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155 def testheadrevs(self): |
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156 idx = self.parseindex() |
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157 self.assertEqual(dagop.headrevs(idx, [1, 2, 3]), {3}) |
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158 |
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159 |
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160 if __name__ == '__main__': |
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161 import silenttestrunner |
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162 |
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163 silenttestrunner.main(__name__) |