scripts/test_image_unittest.py

# Copyright 2014 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Unit tests for the functions in test_image."""

import os
import tempfile
import unittest

from chromite.lib import constants
from chromite.lib import cros_build_lib
from chromite.lib import cros_test_lib
from chromite.lib import image_lib
from chromite.lib import image_test_lib
from chromite.lib import osutils
from chromite.scripts import test_image


class TestImageTest(cros_test_lib.MockTempDirTestCase):
  """Common class for tests ImageTest.

  This sets up proper directory with test image. The image file is zero-byte.
  """

  def setUp(self):
    # Create empty image file.
    self.image_file = os.path.join(self.tempdir,
                                   constants.BASE_IMAGE_NAME + '.bin')
    osutils.AllocateFile(self.image_file, 1024 * 1024)
    # In case sfdisk is in /sbin, search that too.
    cros_build_lib.run(
        ['sfdisk', self.image_file],
        extra_env={'PATH': '/sbin:/usr/sbin:%s' % os.environ['PATH']},
        input='label: dos')
    fake_partitions = (
        image_lib.PartitionInfo(1, 0, 0, 0, 'fs', 'STATE', 'flag'),
        image_lib.PartitionInfo(2, 0, 0, 0, 'fs', 'KERN-A', 'flag'),
        image_lib.PartitionInfo(3, 0, 0, 0, 'fs', 'ROOT-A', 'flag'),
    )
    self.PatchObject(image_lib, 'GetImageDiskPartitionInfo',
                     autospec=True, return_value=fake_partitions)
    self.PatchObject(image_lib.LoopbackPartitions, '_Mount', autospec=True)
    self.PatchObject(image_lib.LoopbackPartitions, '_Unmount', autospec=True)


class FindImageTest(TestImageTest):
  """Test FindImage() function."""

  def _testFindOkay(self, image_path):
    res = test_image.FindImage(image_path)
    self.assertEqual(
        res,
        os.path.join(self.tempdir, constants.BASE_IMAGE_NAME + '.bin')
    )

  def testFindWithDirectory(self):
    self._testFindOkay(self.tempdir)

  def testFindWithFile(self):
    self._testFindOkay(self.image_file)

  def testFindWithInvalid(self):
    self.assertRaises(ValueError, test_image.FindImage,
                      os.path.join(self.tempdir, '404'))

  def testFindWithInvalidDirectory(self):
    os.unlink(self.image_file)
    self.assertRaises(ValueError, test_image.FindImage,
                      os.path.join(self.tempdir))


class MainTest(TestImageTest):
  """Test the main invocation of the script."""

  def testChdir(self):
    """Verify the CWD is in a temp directory."""

    class CwdTest(image_test_lib.ImageTestCase):
      """A stub test class to verify current working directory."""

      _expected_dir = None

      def SetCwd(self, cwd):
        self._expected_dir = cwd

      def testExpectedCwd(self):
        self.assertEqual(self._expected_dir, os.getcwd())

    self.assertNotEqual('/tmp', os.getcwd())
    os.chdir('/tmp')

    test = CwdTest('testExpectedCwd')
    suite = image_test_lib.ImageTestSuite()
    suite.addTest(test)
    self.PatchObject(unittest.TestLoader, 'loadTestsFromName', autospec=True,
                     return_value=suite)

    # Set up the expected directory.
    expected_dir = os.path.join(self.tempdir, 'my-subdir')
    os.mkdir(expected_dir)
    test.SetCwd(expected_dir)
    self.PatchObject(tempfile, 'mkdtemp', autospec=True,
                     return_value=expected_dir)

    argv = [str(self.tempdir)]
    self.assertEqual(0, test_image.main(argv))
    self.assertEqual('/tmp', os.getcwd())

  def testBoardAndDirectory(self):
    """Verify that "--board", "--test_results_root" are passed to the tests."""

    class AttributeTest(image_test_lib.ImageTestCase):
      """Stub test class to hold board and directory."""

      def testOkay(self):
        pass

    test = AttributeTest('testOkay')
    suite = image_test_lib.ImageTestSuite()
    suite.addTest(test)
    self.PatchObject(unittest.TestLoader, 'loadTestsFromName', autospec=True,
                     return_value=suite)
    argv = [
        '--board',
        'my-board',
        '--test_results_root',
        'your-root',
        str(self.tempdir),
    ]
    test_image.main(argv)
    # pylint: disable=protected-access
    self.assertEqual('my-board', test._board)
    # pylint: disable=protected-access
    self.assertEqual('your-root', os.path.basename(test._result_dir))