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annotate tests/test-stdio.py @ 45070:bc05c13e246f

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tests: make names in test-stdio.py more distinctive This way, more tests can be added without name clashes.
author Manuel Jacob <me@manueljacob.de>
date Tue, 07 Jul 2020 11:10:07 +0200
parents 9172fd511999
children fa270dcbdb55
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python
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2 """
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3 Tests the buffering behavior of stdio streams in `mercurial.utils.procutil`.
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4 """
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5 from __future__ import absolute_import
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6
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7 import contextlib
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8 import errno
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9 import os
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10 import subprocess
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11 import sys
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12 import unittest
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13
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14 from mercurial import pycompat
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15
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16
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17 BUFFERING_CHILD_SCRIPT = r'''
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18 import os
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19
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20 from mercurial import dispatch
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21 from mercurial.utils import procutil
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22
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23 dispatch.initstdio()
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24 procutil.{stream}.write(b'aaa')
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25 os.write(procutil.{stream}.fileno(), b'[written aaa]')
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26 procutil.{stream}.write(b'bbb\n')
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27 os.write(procutil.{stream}.fileno(), b'[written bbb\\n]')
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28 '''
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29 UNBUFFERED = b'aaa[written aaa]bbb\n[written bbb\\n]'
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30 LINE_BUFFERED = b'[written aaa]aaabbb\n[written bbb\\n]'
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31 FULLY_BUFFERED = b'[written aaa][written bbb\\n]aaabbb\n'
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32
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33
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34 @contextlib.contextmanager
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35 def _closing(fds):
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36 try:
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37 yield
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38 finally:
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39 for fd in fds:
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40 try:
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41 os.close(fd)
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42 except EnvironmentError:
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43 pass
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45
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46 @contextlib.contextmanager
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47 def _pipes():
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48 rwpair = os.pipe()
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49 with _closing(rwpair):
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50 yield rwpair
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51
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52
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53 @contextlib.contextmanager
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54 def _ptys():
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55 if pycompat.iswindows:
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56 raise unittest.SkipTest("PTYs are not supported on Windows")
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57 import pty
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58 import tty
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59
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60 rwpair = pty.openpty()
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61 with _closing(rwpair):
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62 tty.setraw(rwpair[0])
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63 yield rwpair
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64
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65
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66 def _readall(fd, buffer_size):
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67 buf = []
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68 while True:
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69 try:
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70 s = os.read(fd, buffer_size)
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71 except OSError as e:
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72 if e.errno == errno.EIO:
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73 # If the child-facing PTY got closed, reading from the
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74 # parent-facing PTY raises EIO.
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75 break
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76 raise
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77 if not s:
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78 break
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79 buf.append(s)
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80 return b''.join(buf)
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81
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82
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83 class TestStdio(unittest.TestCase):
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84 def _test(self, stream, rwpair_generator, expected_output, python_args=[]):
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85 assert stream in ('stdout', 'stderr')
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86 with rwpair_generator() as (stream_receiver, child_stream), open(
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87 os.devnull, 'rb'
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88 ) as child_stdin:
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89 proc = subprocess.Popen(
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90 [sys.executable]
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91 + python_args
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92 + ['-c', BUFFERING_CHILD_SCRIPT.format(stream=stream)],
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93 stdin=child_stdin,
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94 stdout=child_stream if stream == 'stdout' else None,
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95 stderr=child_stream if stream == 'stderr' else None,
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96 )
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97 try:
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98 os.close(child_stream)
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99 self.assertEqual(
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100 _readall(stream_receiver, 1024), expected_output
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101 )
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102 except: # re-raises
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103 proc.terminate()
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104 raise
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105 finally:
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106 retcode = proc.wait()
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107 self.assertEqual(retcode, 0)
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108
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109 def test_buffering_stdout_pipes(self):
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110 self._test('stdout', _pipes, FULLY_BUFFERED)
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111
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112 def test_buffering_stdout_ptys(self):
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113 self._test('stdout', _ptys, LINE_BUFFERED)
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114
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115 def test_buffering_stdout_pipes_unbuffered(self):
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116 self._test('stdout', _pipes, UNBUFFERED, python_args=['-u'])
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117
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118 def test_buffering_stdout_ptys_unbuffered(self):
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119 self._test('stdout', _ptys, UNBUFFERED, python_args=['-u'])
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120
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121 if not pycompat.ispy3 and not pycompat.iswindows:
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122 # On Python 2 on non-Windows, we manually open stdout in line-buffered
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123 # mode if connected to a TTY. We should check if Python was configured
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124 # to use unbuffered stdout, but it's hard to do that.
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125 test_buffering_stdout_ptys_unbuffered = unittest.expectedFailure(
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126 test_buffering_stdout_ptys_unbuffered
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127 )
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128
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129 def test_buffering_stderr_pipes(self):
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130 self._test('stderr', _pipes, UNBUFFERED)
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131
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132 def test_buffering_stderr_ptys(self):
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133 self._test('stderr', _ptys, UNBUFFERED)
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134
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135 def test_buffering_stderr_pipes_unbuffered(self):
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136 self._test('stderr', _pipes, UNBUFFERED, python_args=['-u'])
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137
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138 def test_buffering_stderr_ptys_unbuffered(self):
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139 self._test('stderr', _ptys, UNBUFFERED, python_args=['-u'])
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140
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141
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142 if __name__ == '__main__':
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143 import silenttestrunner
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144
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145 silenttestrunner.main(__name__)