Synnefo » snf-ganeti » ganeti-local

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

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# General Public License for more details.

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"""Utilities for unit testing"""

import os

import stat

import tempfile

import unittest

from ganeti import utils

def GetSourceDir():

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

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, err:

        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 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)

  @staticmethod

  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)

  @classmethod

  def _ReadTestData(cls, name):

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

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

    proper test file name.

    """

    return utils.ReadFile(cls._TestDataFilename(name))

  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 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