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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.kernel.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.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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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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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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out, err = assemble_output(kc.iopub_channel)
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self.assertEqual(out, 'bar\n')
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