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# encoding: utf-8
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"""
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Test the output capture at the OS level, using file descriptors.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2009 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is
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# in the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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# Tell nose to skip this module
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__test__ = {}
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from cStringIO import StringIO
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import os
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from twisted.trial import unittest
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from IPython.testing import decorators_trial as dec
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#-----------------------------------------------------------------------------
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# Tests
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#-----------------------------------------------------------------------------
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class TestRedirector(unittest.TestCase):
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@dec.skip_win32
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def test_redirector(self):
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"""Checks that the redirector can be used to do synchronous capture.
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"""
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from IPython.kernel.core.fd_redirector import FDRedirector
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r = FDRedirector()
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out = StringIO()
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try:
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r.start()
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for i in range(10):
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os.system('echo %ic' % i)
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print >>out, r.getvalue(),
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print >>out, i
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except:
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r.stop()
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raise
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r.stop()
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result1 = out.getvalue()
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result2 = "".join("%ic\n%i\n" %(i, i) for i in range(10))
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self.assertEquals(result1, result2)
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@dec.skip_win32
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def test_redirector_output_trap(self):
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"""Check the greedy trapping behavior of the traps.
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This test check not only that the redirector_output_trap does
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trap the output, but also that it does it in a gready way, that
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is by calling the callback ASAP.
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"""
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from IPython.kernel.core.redirector_output_trap import RedirectorOutputTrap
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out = StringIO()
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trap = RedirectorOutputTrap(out.write, out.write)
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try:
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trap.set()
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for i in range(10):
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os.system('echo %ic' % i)
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print "%ip" % i
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print >>out, i
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except:
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trap.unset()
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raise
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trap.unset()
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result1 = out.getvalue()
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result2 = "".join("%ic\n%ip\n%i\n" %(i, i, i) for i in range(10))
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self.assertEquals(result1, result2)
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