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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"
tee.close()
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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