111 lines
3.5 KiB
Python
111 lines
3.5 KiB
Python
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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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from __future__ import print_function
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import sys
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import unittest
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from ipykernel.inprocess.blocking import BlockingInProcessKernelClient
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from ipykernel.inprocess.manager import InProcessKernelManager
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from ipykernel.inprocess.ipkernel import InProcessKernel
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from ipykernel.tests.utils import assemble_output
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from IPython.testing.decorators import skipif_not_matplotlib
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from IPython.utils.io import capture_output
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from ipython_genutils import py3compat
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if py3compat.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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def _init_asyncio_patch():
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"""set default asyncio policy to be compatible with tornado
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Tornado 6 (at least) is not compatible with the default
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asyncio implementation on Windows
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Pick the older SelectorEventLoopPolicy on Windows
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if the known-incompatible default policy is in use.
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do this as early as possible to make it a low priority and overrideable
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ref: https://github.com/tornadoweb/tornado/issues/2608
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FIXME: if/when tornado supports the defaults in asyncio,
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remove and bump tornado requirement for py38
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"""
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if sys.platform.startswith("win") and sys.version_info >= (3, 8):
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import asyncio
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try:
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from asyncio import (
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WindowsProactorEventLoopPolicy,
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WindowsSelectorEventLoopPolicy,
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)
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except ImportError:
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pass
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# not affected
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else:
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if type(asyncio.get_event_loop_policy()) is WindowsProactorEventLoopPolicy:
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# WindowsProactorEventLoopPolicy is not compatible with tornado 6
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# fallback to the pre-3.8 default of Selector
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asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy())
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class InProcessKernelTestCase(unittest.TestCase):
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def setUp(self):
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_init_asyncio_patch()
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self.km = InProcessKernelManager()
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self.km.start_kernel()
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self.kc = self.km.client()
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self.kc.start_channels()
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self.kc.wait_for_ready()
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@skipif_not_matplotlib
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def test_pylab(self):
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"""Does %pylab work in the in-process kernel?"""
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kc = self.kc
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kc.execute('%pylab')
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out, err = assemble_output(kc.iopub_channel)
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self.assertIn('matplotlib', out)
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def test_raw_input(self):
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""" Does the in-process kernel handle raw_input correctly?
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"""
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io = StringIO('foobar\n')
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sys_stdin = sys.stdin
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sys.stdin = io
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try:
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if py3compat.PY3:
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self.kc.execute('x = input()')
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else:
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self.kc.execute('x = raw_input()')
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finally:
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sys.stdin = sys_stdin
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assert self.km.kernel.shell.user_ns.get('x') == 'foobar'
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def test_stdout(self):
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""" Does the in-process kernel correctly capture IO?
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"""
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kernel = InProcessKernel()
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with capture_output() as io:
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kernel.shell.run_cell('print("foo")')
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assert io.stdout == 'foo\n'
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kc = BlockingInProcessKernelClient(kernel=kernel, session=kernel.session)
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kernel.frontends.append(kc)
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kc.execute('print("bar")')
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out, err = assemble_output(kc.iopub_channel)
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assert out == 'bar\n'
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def test_getpass_stream(self):
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"Tests that kernel getpass accept the stream parameter"
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kernel = InProcessKernel()
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kernel._allow_stdin = True
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kernel._input_request = lambda *args, **kwargs : None
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kernel.getpass(stream='non empty')
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