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annotate tests/test-cappedreader.py @ 36729:389b950f5190

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py3: use startswith() instead of slicing to detect leading whitespace
author Yuya Nishihara <yuya@tcha.org>
date Sun, 04 Mar 2018 15:24:45 -0500
parents 01e29e885600
children 2372284d9457
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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01e29e885600 util: add a file object proxy that can read at most N bytes
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1 from __future__ import absolute_import, print_function
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2
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3 import io
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4 import unittest
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5
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6 from mercurial import (
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7 util,
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8 )
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9
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10 class CappedReaderTests(unittest.TestCase):
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11 def testreadfull(self):
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12 source = io.BytesIO(b'x' * 100)
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13
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14 reader = util.cappedreader(source, 10)
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15 res = reader.read(10)
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16 self.assertEqual(res, b'x' * 10)
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17 self.assertEqual(source.tell(), 10)
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18 source.seek(0)
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19
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20 reader = util.cappedreader(source, 15)
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21 res = reader.read(16)
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22 self.assertEqual(res, b'x' * 15)
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23 self.assertEqual(source.tell(), 15)
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24 source.seek(0)
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25
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26 reader = util.cappedreader(source, 100)
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27 res = reader.read(100)
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28 self.assertEqual(res, b'x' * 100)
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29 self.assertEqual(source.tell(), 100)
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30 source.seek(0)
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31
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32 reader = util.cappedreader(source, 50)
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33 res = reader.read()
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34 self.assertEqual(res, b'x' * 50)
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35 self.assertEqual(source.tell(), 50)
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36 source.seek(0)
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37
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38 def testreadnegative(self):
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39 source = io.BytesIO(b'x' * 100)
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40
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41 reader = util.cappedreader(source, 20)
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42 res = reader.read(-1)
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43 self.assertEqual(res, b'x' * 20)
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44 self.assertEqual(source.tell(), 20)
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45 source.seek(0)
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46
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47 reader = util.cappedreader(source, 100)
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48 res = reader.read(-1)
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49 self.assertEqual(res, b'x' * 100)
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50 self.assertEqual(source.tell(), 100)
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51 source.seek(0)
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52
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53 def testreadmultiple(self):
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54 source = io.BytesIO(b'x' * 100)
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55
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56 reader = util.cappedreader(source, 10)
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57 for i in range(10):
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58 res = reader.read(1)
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59 self.assertEqual(res, b'x')
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60 self.assertEqual(source.tell(), i + 1)
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61
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62 self.assertEqual(source.tell(), 10)
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63 res = reader.read(1)
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64 self.assertEqual(res, b'')
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65 self.assertEqual(source.tell(), 10)
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66 source.seek(0)
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67
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68 reader = util.cappedreader(source, 45)
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69 for i in range(4):
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70 res = reader.read(10)
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71 self.assertEqual(res, b'x' * 10)
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72 self.assertEqual(source.tell(), (i + 1) * 10)
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73
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74 res = reader.read(10)
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75 self.assertEqual(res, b'x' * 5)
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76 self.assertEqual(source.tell(), 45)
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77
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78 def readlimitpasteof(self):
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79 source = io.BytesIO(b'x' * 100)
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80
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81 reader = util.cappedreader(source, 1024)
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82 res = reader.read(1000)
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83 self.assertEqual(res, b'x' * 100)
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84 self.assertEqual(source.tell(), 100)
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85 res = reader.read(1000)
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86 self.assertEqual(res, b'')
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87 self.assertEqual(source.tell(), 100)
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88
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89 if __name__ == '__main__':
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90 import silenttestrunner
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91 silenttestrunner.main(__name__)