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bzrlib/tests/test_strace.py
 
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# Copyright (C) 2007 Canonical Ltd
 
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#   Authors: Robert Collins <robert.collins@canonical.com>
 
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#
 
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# This program is free software; you can redistribute it and/or modify
 
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# it under the terms of the GNU General Public License as published by
 
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# the Free Software Foundation; either version 2 of the License, or
 
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# (at your option) any later version.
 
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#
 
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# This program is distributed in the hope that it will be useful,
 
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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# GNU General Public License for more details.
 
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#
 
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# You should have received a copy of the GNU General Public License
 
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# along with this program; if not, write to the Free Software
 
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
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"""Tests for the strace-invoking support."""
 
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import errno
 
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import subprocess
 
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from bzrlib.strace import StraceFeature, strace, StraceResult
 
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from bzrlib.tests import TestCaseWithTransport
 
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class TestStraceFeature(TestCaseWithTransport):
 
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    def test_strace_detection(self):
 
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        """Strace is available if its runnable."""
 
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        try:
 
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            proc = subprocess.Popen(['strace'],
 
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                stderr=subprocess.PIPE,
 
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                stdout=subprocess.PIPE)
 
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            proc.communicate()
 
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            found_strace = True
 
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        except OSError, e:
 
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            if e.errno == errno.ENOENT:
 
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                # strace is not installed
 
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                found_strace = False
 
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            else:
 
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                raise
 
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        self.assertEqual(found_strace, StraceFeature.available())
 
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class TestStrace(TestCaseWithTransport):
 
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    _test_needs_features = [StraceFeature]
 
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    def test_strace_callable_is_called(self):
 
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        output = []
 
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        def function(positional, *args, **kwargs):
 
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            output.append((positional, args, kwargs))
 
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        strace(function, "a", "b", c="c")
 
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        self.assertEqual([("a", ("b",), {"c":"c"})], output)
 
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    def test_strace_callable_result(self):
 
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        def function():
 
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            return "foo"
 
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        result, strace_result = strace(function)
 
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        self.assertEqual("foo", result)
 
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        self.assertIsInstance(strace_result, StraceResult)
 
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    def test_strace_result_has_raw_log(self):
 
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        """Checks that a reasonable raw strace log was found by strace."""
 
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        def function():
 
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            self.build_tree(['myfile'])
 
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        _, result = strace(function)
 
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        self.assertContainsRe(result.raw_log, 'myfile')