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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

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# General Public License for more details.

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"""Utilities for unit testing"""

import os

import tempfile

import unittest

from ganeti import utils

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 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)

  @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

    """

    prefix = os.environ.get("srcdir", "")

    if prefix:

      prefix = prefix + "/test/"

    return "%sdata/%s" % (prefix, 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