Synnefo » snf-ganeti

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#

# Copyright (C) 2006, 2007, 2008 Google Inc.

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# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

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# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

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# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Utilities for unit testing"""

import os

import sys

import stat

import tempfile

import unittest

import logging

from ganeti import utils

def GetSourceDir():

  return os.environ.get("TOP_SRCDIR", ".")

def TestDataFilename(name):

  """Returns the filename of a given test data file.

  @type name: str

  @param name: the 'base' of the file name, as present in

      the test/data directory

  @rtype: str

  @return: the full path to the filename, such that it can

      be used in 'make distcheck' rules

  """

  return "%s/test/data/%s" % (GetSourceDir(), name)

def ReadTestData(name):

  """Returns the content of a test data file.

  This is just a very simple wrapper over utils.ReadFile with the

  proper test file name.

  """

  return utils.ReadFile(TestDataFilename(name))

def _SetupLogging(verbose):

  """Setupup logging infrastructure.

  """

  fmt = logging.Formatter("%(asctime)s: %(threadName)s"

                          " %(levelname)s %(message)s")

  if verbose:

    handler = logging.StreamHandler()

  else:

    handler = logging.FileHandler(os.devnull, "a")

  handler.setLevel(logging.NOTSET)

  handler.setFormatter(fmt)

  root_logger = logging.getLogger("")

  root_logger.setLevel(logging.NOTSET)

  root_logger.addHandler(handler)

class GanetiTestProgram(unittest.TestProgram):

  def runTests(self):

    """Runs all tests.

    """

    _SetupLogging("LOGTOSTDERR" in os.environ)

    sys.stderr.write("Running %s\n" % self.progName)

    sys.stderr.flush()

    # Ensure assertions will be evaluated

    if not __debug__:

      raise Exception("Not running in debug mode, assertions would not be"

                      " evaluated")

    # Check again, this time with a real assertion

    try:

      assert False

    except AssertionError:

      pass

    else:

      raise Exception("Assertion not evaluated")

    return unittest.TestProgram.runTests(self)

class GanetiTestCase(unittest.TestCase):

  """Helper class for unittesting.

  This class defines a few utility functions that help in building

  unittests. Child classes must call the parent setup and cleanup.

  """

  def setUp(self):

    self._temp_files = []

  def tearDown(self):

    while self._temp_files:

      try:

        utils.RemoveFile(self._temp_files.pop())

      except EnvironmentError:

        pass

  def assertFileContent(self, file_name, expected_content):

    """Checks that the content of a file is what we expect.

    @type file_name: str

    @param file_name: the file whose contents we should check

    @type expected_content: str

    @param expected_content: the content we expect

    """

    actual_content = utils.ReadFile(file_name)

    self.assertEqual(actual_content, expected_content)

  def assertFileMode(self, file_name, expected_mode):

    """Checks that the mode of a file is what we expect.

    @type file_name: str

    @param file_name: the file whose contents we should check

    @type expected_mode: int

    @param expected_mode: the mode we expect

    """

    st = os.stat(file_name)

    actual_mode = stat.S_IMODE(st.st_mode)

    self.assertEqual(actual_mode, expected_mode)

  def assertFileUid(self, file_name, expected_uid):

    """Checks that the user id of a file is what we expect.

    @type file_name: str

    @param file_name: the file whose contents we should check

    @type expected_uid: int

    @param expected_uid: the user id we expect

    """

    st = os.stat(file_name)

    actual_uid = st.st_uid

    self.assertEqual(actual_uid, expected_uid)

  def assertFileGid(self, file_name, expected_gid):

    """Checks that the group id of a file is what we expect.

    @type file_name: str

    @param file_name: the file whose contents we should check

    @type expected_gid: int

    @param expected_gid: the group id we expect

    """

    st = os.stat(file_name)

    actual_gid = st.st_gid

    self.assertEqual(actual_gid, expected_gid)

  def assertEqualValues(self, first, second, msg=None):

    """Compares two values whether they're equal.

    Tuples are automatically converted to lists before comparing.

    """

    return self.assertEqual(UnifyValueType(first),

                            UnifyValueType(second),

                            msg=msg)

  def _CreateTempFile(self):

    """Creates a temporary file and adds it to the internal cleanup list.

    This method simplifies the creation and cleanup of temporary files

    during tests.

    """

    fh, fname = tempfile.mkstemp(prefix="ganeti-test", suffix=".tmp")

    os.close(fh)

    self._temp_files.append(fname)

    return fname

def patch_object(*args, **kwargs):

  """Unified patch_object for various versions of Python Mock.

  Different Python Mock versions provide incompatible versions of patching an

  object. More recent versions use _patch_object, older ones used patch_object.

  This function unifies the different variations.

  """

  import mock

  try:

    # pylint: disable=W0212

    return mock._patch_object(*args, **kwargs)

  except AttributeError:

    # pylint: disable=E1101

    return mock.patch_object(*args, **kwargs)

def UnifyValueType(data):

  """Converts all tuples into lists.

  This is useful for unittests where an external library doesn't keep types.

  """

  if isinstance(data, (tuple, list)):

    return [UnifyValueType(i) for i in data]

  elif isinstance(data, dict):

    return dict([(UnifyValueType(key), UnifyValueType(value))

                 for (key, value) in data.iteritems()])

  return data

class CallCounter(object):

  """Utility class to count number of calls to a function/method.

  """

  def __init__(self, fn):

    """Initializes this class.

    @type fn: Callable

    """

    self._fn = fn

    self._count = 0

  def __call__(self, *args, **kwargs):

    """Calls wrapped function with given parameters.

    """

    self._count += 1

    return self._fn(*args, **kwargs)

  def Count(self):

    """Returns number of calls.

    @rtype: number

    """

    return self._count