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BUG=b:233893248
TEST=CQ

Change-Id: I66591d7a738d241aed3290138c0f68065ab10a6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3879174
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Alex Klein <saklein@chromium.org>
diff --git a/scripts/test_image_unittest.py b/scripts/test_image_unittest.py
index 9c718e0..0674220 100644
--- a/scripts/test_image_unittest.py
+++ b/scripts/test_image_unittest.py
@@ -18,118 +18,136 @@
 
 
 class TestImageTest(cros_test_lib.MockTempDirTestCase):
-  """Common class for tests ImageTest.
+    """Common class for tests ImageTest.
 
-  This sets up proper directory with test image. The image file is zero-byte.
-  """
+    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)
+    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."""
+    """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 _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 testFindWithDirectory(self):
+        self._testFindOkay(self.tempdir)
 
-  def testFindWithFile(self):
-    self._testFindOkay(self.image_file)
+    def testFindWithFile(self):
+        self._testFindOkay(self.image_file)
 
-  def testFindWithInvalid(self):
-    self.assertRaises(ValueError, test_image.FindImage,
-                      os.path.join(self.tempdir, '404'))
+    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))
+    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."""
+    """Test the main invocation of the script."""
 
-  def testChdir(self):
-    """Verify the CWD is in a temp directory."""
+    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."""
+        class CwdTest(image_test_lib.ImageTestCase):
+            """A stub test class to verify current working directory."""
 
-      _expected_dir = None
+            _expected_dir = None
 
-      def SetCwd(self, cwd):
-        self._expected_dir = cwd
+            def SetCwd(self, cwd):
+                self._expected_dir = cwd
 
-      def testExpectedCwd(self):
-        self.assertEqual(self._expected_dir, os.getcwd())
+            def testExpectedCwd(self):
+                self.assertEqual(self._expected_dir, os.getcwd())
 
-    self.assertNotEqual('/tmp', os.getcwd())
-    os.chdir('/tmp')
+        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)
+        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)
+        # 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())
+        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."""
+    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."""
+        class AttributeTest(image_test_lib.ImageTestCase):
+            """Stub test class to hold board and directory."""
 
-      def testOkay(self):
-        pass
+            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))
+        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))