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# encoding: utf-8
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"""Tests for io.py"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from __future__ import print_function
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from __future__ import absolute_import
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import io as stdlib_io
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import os.path
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import stat
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import sys
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from subprocess import Popen, PIPE
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import unittest
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import nose.tools as nt
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from IPython.testing.decorators import skipif
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from IPython.utils.io import (Tee, capture_output, unicode_std_stream,
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atomic_writing,
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)
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from IPython.utils.py3compat import doctest_refactor_print, PY3
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from IPython.utils.tempdir import TemporaryDirectory
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if PY3:
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from io import StringIO
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else:
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from StringIO import StringIO
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#-----------------------------------------------------------------------------
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# Tests
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#-----------------------------------------------------------------------------
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def test_tee_simple():
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"Very simple check with stdout only"
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chan = StringIO()
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text = 'Hello'
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tee = Tee(chan, channel='stdout')
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print(text, file=chan)
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nt.assert_equal(chan.getvalue(), text+"\n")
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class TeeTestCase(unittest.TestCase):
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def tchan(self, channel, check='close'):
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trap = StringIO()
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chan = StringIO()
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text = 'Hello'
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std_ori = getattr(sys, channel)
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setattr(sys, channel, trap)
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tee = Tee(chan, channel=channel)
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print(text, end='', file=chan)
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setattr(sys, channel, std_ori)
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trap_val = trap.getvalue()
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nt.assert_equal(chan.getvalue(), text)
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if check=='close':
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tee.close()
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else:
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del tee
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def test(self):
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for chan in ['stdout', 'stderr']:
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for check in ['close', 'del']:
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self.tchan(chan, check)
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def test_io_init():
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"""Test that io.stdin/out/err exist at startup"""
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for name in ('stdin', 'stdout', 'stderr'):
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cmd = doctest_refactor_print("from IPython.utils import io;print io.%s.__class__"%name)
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p = Popen([sys.executable, '-c', cmd],
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stdout=PIPE)
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p.wait()
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classname = p.stdout.read().strip().decode('ascii')
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# __class__ is a reference to the class object in Python 3, so we can't
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# just test for string equality.
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assert 'IPython.utils.io.IOStream' in classname, classname
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def test_capture_output():
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"""capture_output() context works"""
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with capture_output() as io:
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print('hi, stdout')
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print('hi, stderr', file=sys.stderr)
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nt.assert_equal(io.stdout, 'hi, stdout\n')
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nt.assert_equal(io.stderr, 'hi, stderr\n')
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def test_UnicodeStdStream():
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# Test wrapping a bytes-level stdout
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if PY3:
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stdoutb = stdlib_io.BytesIO()
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stdout = stdlib_io.TextIOWrapper(stdoutb, encoding='ascii')
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else:
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stdout = stdoutb = stdlib_io.BytesIO()
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orig_stdout = sys.stdout
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sys.stdout = stdout
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try:
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sample = u"@łe¶ŧ←"
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unicode_std_stream().write(sample)
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output = stdoutb.getvalue().decode('utf-8')
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nt.assert_equal(output, sample)
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assert not stdout.closed
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finally:
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sys.stdout = orig_stdout
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@skipif(not PY3, "Not applicable on Python 2")
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def test_UnicodeStdStream_nowrap():
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# If we replace stdout with a StringIO, it shouldn't get wrapped.
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orig_stdout = sys.stdout
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sys.stdout = StringIO()
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try:
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nt.assert_is(unicode_std_stream(), sys.stdout)
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assert not sys.stdout.closed
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finally:
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sys.stdout = orig_stdout
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def test_atomic_writing():
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class CustomExc(Exception): pass
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with TemporaryDirectory() as td:
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f1 = os.path.join(td, 'penguin')
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with stdlib_io.open(f1, 'w') as f:
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f.write(u'Before')
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if os.name != 'nt':
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os.chmod(f1, 0o701)
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orig_mode = stat.S_IMODE(os.stat(f1).st_mode)
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f2 = os.path.join(td, 'flamingo')
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try:
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os.symlink(f1, f2)
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have_symlink = True
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except (AttributeError, NotImplementedError, OSError):
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# AttributeError: Python doesn't support it
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# NotImplementedError: The system doesn't support it
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# OSError: The user lacks the privilege (Windows)
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have_symlink = False
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with nt.assert_raises(CustomExc):
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with atomic_writing(f1) as f:
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f.write(u'Failing write')
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raise CustomExc
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# Because of the exception, the file should not have been modified
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with stdlib_io.open(f1, 'r') as f:
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nt.assert_equal(f.read(), u'Before')
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with atomic_writing(f1) as f:
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f.write(u'Overwritten')
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with stdlib_io.open(f1, 'r') as f:
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nt.assert_equal(f.read(), u'Overwritten')
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if os.name != 'nt':
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mode = stat.S_IMODE(os.stat(f1).st_mode)
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nt.assert_equal(mode, orig_mode)
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if have_symlink:
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# Check that writing over a file preserves a symlink
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with atomic_writing(f2) as f:
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f.write(u'written from symlink')
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with stdlib_io.open(f1, 'r') as f:
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nt.assert_equal(f.read(), u'written from symlink')
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def test_atomic_writing_newlines():
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with TemporaryDirectory() as td:
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path = os.path.join(td, 'testfile')
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lf = u'a\nb\nc\n'
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plat = lf.replace(u'\n', os.linesep)
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crlf = lf.replace(u'\n', u'\r\n')
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# test default
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with stdlib_io.open(path, 'w') as f:
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f.write(lf)
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with stdlib_io.open(path, 'r', newline='') as f:
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read = f.read()
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nt.assert_equal(read, plat)
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# test newline=LF
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with stdlib_io.open(path, 'w', newline='\n') as f:
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f.write(lf)
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with stdlib_io.open(path, 'r', newline='') as f:
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read = f.read()
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nt.assert_equal(read, lf)
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# test newline=CRLF
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with atomic_writing(path, newline='\r\n') as f:
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f.write(lf)
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with stdlib_io.open(path, 'r', newline='') as f:
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read = f.read()
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nt.assert_equal(read, crlf)
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# test newline=no convert
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text = u'crlf\r\ncr\rlf\n'
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with atomic_writing(path, newline='') as f:
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f.write(text)
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with stdlib_io.open(path, 'r', newline='') as f:
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read = f.read()
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nt.assert_equal(read, text)
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