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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 IPython.kernel.inprocess.blocking import BlockingInProcessKernelClient
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from IPython.kernel.inprocess.manager import InProcessKernelManager
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from IPython.kernel.inprocess.ipkernel import InProcessKernel
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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.utils 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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class InProcessKernelTestCase(unittest.TestCase):
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def setUp(self):
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self.km = InProcessKernelManager()
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self.km.start_kernel()
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self.kc = BlockingInProcessKernelClient(kernel=self.km.kernel)
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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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msg = get_stream_message(kc)
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self.assertIn('matplotlib', msg['content']['text'])
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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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self.assertEqual(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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self.assertEqual(io.stdout, 'foo\n')
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kc = BlockingInProcessKernelClient(kernel=kernel)
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kernel.frontends.append(kc)
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kc.execute('print("bar")')
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msg = get_stream_message(kc)
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self.assertEqual(msg['content']['text'], 'bar\n')
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#-----------------------------------------------------------------------------
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# Utility functions
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#-----------------------------------------------------------------------------
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def get_stream_message(kernel_client, timeout=5):
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""" Gets a single stream message synchronously from the sub channel.
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"""
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while True:
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msg = kernel_client.get_iopub_msg(timeout=timeout)
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if msg['header']['msg_type'] == 'stream':
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return msg
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if __name__ == '__main__':
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unittest.main()
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