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# encoding: utf-8 """Tests for io.py""" # Copyright (c) IPython Development Team. # Distributed under the terms of the Modified BSD License. import sys from io import StringIO import unittest from IPython.utils.io import Tee, capture_output def test_tee_simple(): "Very simple check with stdout only" chan = StringIO() text = 'Hello' tee = Tee(chan, channel='stdout') print(text, file=chan) assert chan.getvalue() == text + "\n" class TeeTestCase(unittest.TestCase): def tchan(self, channel): trap = StringIO() chan = StringIO() text = 'Hello' std_ori = getattr(sys, channel) setattr(sys, channel, trap) tee = Tee(chan, channel=channel) print(text, end='', file=chan) trap_val = trap.getvalue() self.assertEqual(chan.getvalue(), text) tee.close() setattr(sys, channel, std_ori) assert getattr(sys, channel) == std_ori def test(self): for chan in ['stdout', 'stderr']: self.tchan(chan) class TestIOStream(unittest.TestCase): def test_capture_output(self): """capture_output() context works""" with capture_output() as io: print("hi, stdout") print("hi, stderr", file=sys.stderr) self.assertEqual(io.stdout, "hi, stdout\n") self.assertEqual(io.stderr, "hi, stderr\n")
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