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# encoding: utf-8
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"""Tests for io.py"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import sys
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from io import StringIO
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from subprocess import Popen, PIPE
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import unittest
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from IPython.utils.io import IOStream, Tee, capture_output
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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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assert chan.getvalue() == text + "\n"
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class TeeTestCase(unittest.TestCase):
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def tchan(self, channel):
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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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trap_val = trap.getvalue()
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self.assertEqual(chan.getvalue(), text)
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tee.close()
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setattr(sys, channel, std_ori)
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assert getattr(sys, channel) == std_ori
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def test(self):
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for chan in ['stdout', 'stderr']:
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self.tchan(chan)
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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 = "from IPython.utils import io;print(io.%s.__class__)"%name
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with Popen([sys.executable, '-c', cmd], stdout=PIPE) as p:
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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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class TestIOStream(unittest.TestCase):
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def test_IOStream_init(self):
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"""IOStream initializes from a file-like object missing attributes. """
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# Cause a failure from getattr and dir(). (Issue #6386)
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class BadStringIO(StringIO):
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def __dir__(self):
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attrs = super().__dir__()
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attrs.append('name')
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return attrs
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with self.assertWarns(DeprecationWarning):
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iostream = IOStream(BadStringIO())
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iostream.write('hi, bad iostream\n')
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assert not hasattr(iostream, 'name')
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iostream.close()
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def test_capture_output(self):
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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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self.assertEqual(io.stdout, "hi, stdout\n")
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self.assertEqual(io.stderr, "hi, stderr\n")
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