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annotate tests/test-cappedreader.py @ 52174:9fbdf355c916

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author Raphaël Gomès <rgomes@octobus.net>
date Mon, 29 Jul 2024 20:34:38 +0200
parents 6000f5b25c9b
children
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01e29e885600 util: add a file object proxy that can read at most N bytes
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1 import io
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2 import unittest
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3
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4 from mercurial import util
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5
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6
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7 class CappedReaderTests(unittest.TestCase):
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8 def testreadfull(self):
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9 source = io.BytesIO(b'x' * 100)
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10
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11 reader = util.cappedreader(source, 10)
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12 res = reader.read(10)
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13 self.assertEqual(res, b'x' * 10)
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14 self.assertEqual(source.tell(), 10)
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15 source.seek(0)
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16
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17 reader = util.cappedreader(source, 15)
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18 res = reader.read(16)
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19 self.assertEqual(res, b'x' * 15)
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20 self.assertEqual(source.tell(), 15)
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21 source.seek(0)
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22
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23 reader = util.cappedreader(source, 100)
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24 res = reader.read(100)
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25 self.assertEqual(res, b'x' * 100)
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26 self.assertEqual(source.tell(), 100)
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27 source.seek(0)
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28
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29 reader = util.cappedreader(source, 50)
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30 res = reader.read()
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31 self.assertEqual(res, b'x' * 50)
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32 self.assertEqual(source.tell(), 50)
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33 source.seek(0)
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34
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35 def testreadnegative(self):
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36 source = io.BytesIO(b'x' * 100)
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37
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38 reader = util.cappedreader(source, 20)
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39 res = reader.read(-1)
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40 self.assertEqual(res, b'x' * 20)
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41 self.assertEqual(source.tell(), 20)
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42 source.seek(0)
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43
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44 reader = util.cappedreader(source, 100)
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45 res = reader.read(-1)
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46 self.assertEqual(res, b'x' * 100)
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47 self.assertEqual(source.tell(), 100)
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48 source.seek(0)
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49
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50 def testreadmultiple(self):
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51 source = io.BytesIO(b'x' * 100)
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52
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53 reader = util.cappedreader(source, 10)
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54 for i in range(10):
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55 res = reader.read(1)
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56 self.assertEqual(res, b'x')
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57 self.assertEqual(source.tell(), i + 1)
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58
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59 self.assertEqual(source.tell(), 10)
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60 res = reader.read(1)
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61 self.assertEqual(res, b'')
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62 self.assertEqual(source.tell(), 10)
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63 source.seek(0)
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64
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65 reader = util.cappedreader(source, 45)
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66 for i in range(4):
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67 res = reader.read(10)
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68 self.assertEqual(res, b'x' * 10)
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69 self.assertEqual(source.tell(), (i + 1) * 10)
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70
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71 res = reader.read(10)
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72 self.assertEqual(res, b'x' * 5)
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73 self.assertEqual(source.tell(), 45)
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74
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75 def readlimitpasteof(self):
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76 source = io.BytesIO(b'x' * 100)
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77
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78 reader = util.cappedreader(source, 1024)
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79 res = reader.read(1000)
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80 self.assertEqual(res, b'x' * 100)
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81 self.assertEqual(source.tell(), 100)
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82 res = reader.read(1000)
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83 self.assertEqual(res, b'')
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84 self.assertEqual(source.tell(), 100)
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85
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86
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87 if __name__ == '__main__':
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88 import silenttestrunner
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89
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90 silenttestrunner.main(__name__)