Mercurial > hg
view tests/test-stdio.py @ 45070:bc05c13e246f
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> |
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date | Tue, 07 Jul 2020 11:10:07 +0200 |
parents | 9172fd511999 |
children | fa270dcbdb55 |
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#!/usr/bin/env python """ Tests the buffering behavior of stdio streams in `mercurial.utils.procutil`. """ from __future__ import absolute_import import contextlib import errno import os import subprocess import sys import unittest from mercurial import pycompat BUFFERING_CHILD_SCRIPT = r''' import os from mercurial import dispatch from mercurial.utils import procutil dispatch.initstdio() procutil.{stream}.write(b'aaa') os.write(procutil.{stream}.fileno(), b'[written aaa]') procutil.{stream}.write(b'bbb\n') os.write(procutil.{stream}.fileno(), b'[written bbb\\n]') ''' UNBUFFERED = b'aaa[written aaa]bbb\n[written bbb\\n]' LINE_BUFFERED = b'[written aaa]aaabbb\n[written bbb\\n]' FULLY_BUFFERED = b'[written aaa][written bbb\\n]aaabbb\n' @contextlib.contextmanager def _closing(fds): try: yield finally: for fd in fds: try: os.close(fd) except EnvironmentError: pass @contextlib.contextmanager def _pipes(): rwpair = os.pipe() with _closing(rwpair): yield rwpair @contextlib.contextmanager def _ptys(): if pycompat.iswindows: raise unittest.SkipTest("PTYs are not supported on Windows") import pty import tty rwpair = pty.openpty() with _closing(rwpair): tty.setraw(rwpair[0]) yield rwpair def _readall(fd, buffer_size): buf = [] while True: try: s = os.read(fd, buffer_size) except OSError as e: if e.errno == errno.EIO: # If the child-facing PTY got closed, reading from the # parent-facing PTY raises EIO. break raise if not s: break buf.append(s) return b''.join(buf) class TestStdio(unittest.TestCase): def _test(self, stream, rwpair_generator, expected_output, python_args=[]): assert stream in ('stdout', 'stderr') with rwpair_generator() as (stream_receiver, child_stream), open( os.devnull, 'rb' ) as child_stdin: proc = subprocess.Popen( [sys.executable] + python_args + ['-c', BUFFERING_CHILD_SCRIPT.format(stream=stream)], stdin=child_stdin, stdout=child_stream if stream == 'stdout' else None, stderr=child_stream if stream == 'stderr' else None, ) try: os.close(child_stream) self.assertEqual( _readall(stream_receiver, 1024), expected_output ) except: # re-raises proc.terminate() raise finally: retcode = proc.wait() self.assertEqual(retcode, 0) def test_buffering_stdout_pipes(self): self._test('stdout', _pipes, FULLY_BUFFERED) def test_buffering_stdout_ptys(self): self._test('stdout', _ptys, LINE_BUFFERED) def test_buffering_stdout_pipes_unbuffered(self): self._test('stdout', _pipes, UNBUFFERED, python_args=['-u']) def test_buffering_stdout_ptys_unbuffered(self): self._test('stdout', _ptys, UNBUFFERED, python_args=['-u']) if not pycompat.ispy3 and not pycompat.iswindows: # On Python 2 on non-Windows, we manually open stdout in line-buffered # mode if connected to a TTY. We should check if Python was configured # to use unbuffered stdout, but it's hard to do that. test_buffering_stdout_ptys_unbuffered = unittest.expectedFailure( test_buffering_stdout_ptys_unbuffered ) def test_buffering_stderr_pipes(self): self._test('stderr', _pipes, UNBUFFERED) def test_buffering_stderr_ptys(self): self._test('stderr', _ptys, UNBUFFERED) def test_buffering_stderr_pipes_unbuffered(self): self._test('stderr', _pipes, UNBUFFERED, python_args=['-u']) def test_buffering_stderr_ptys_unbuffered(self): self._test('stderr', _ptys, UNBUFFERED, python_args=['-u']) if __name__ == '__main__': import silenttestrunner silenttestrunner.main(__name__)