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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 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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class TestIOStream(unittest.TestCase):
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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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