--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKitTools/Scripts/webkitpy/style/main_unittest.py	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,124 @@
+# Copyright (C) 2010 Chris Jerdonek (cjerdonek@webkit.org)
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1.  Redistributions of source code must retain the above copyright
+#     notice, this list of conditions and the following disclaimer.
+# 2.  Redistributions in binary form must reproduce the above copyright
+#     notice, this list of conditions and the following disclaimer in the
+#     documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR
+# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Unit tests for main.py."""
+
+import os
+import unittest
+
+from main import change_directory
+from webkitpy.style_references import LogTesting
+
+
+class ChangeDirectoryTest(unittest.TestCase):
+
+    """Tests change_directory()."""
+
+    _original_directory = "/original"
+    _checkout_root = "/WebKit"
+
+    class _MockOs(object):
+
+        """A mock os module for unit testing."""
+
+        def __init__(self, test_case):
+            self._test_case = test_case
+            self._current_directory = \
+                ChangeDirectoryTest._original_directory
+
+        def chdir(self, current_directory):
+            self._current_directory = current_directory
+
+        def assertCurrentDirectory(self, expected_directory):
+            self._test_case.assertEquals(expected_directory,
+                                         self._current_directory)
+
+    def setUp(self):
+        self._log = LogTesting.setUp(self)
+        self._mock_os = self._MockOs(self)
+
+    def tearDown(self):
+        self._log.tearDown()
+
+    # This method is a convenient wrapper for change_working_directory() that
+    # passes the mock_os for this unit testing class.
+    def _change_directory(self, paths, checkout_root):
+        return change_directory(paths=paths,
+                                checkout_root=checkout_root,
+                                mock_os=self._mock_os)
+
+    def _assert_result(self, actual_return_value, expected_return_value,
+                       expected_log_messages, expected_current_directory):
+        self.assertEquals(actual_return_value, expected_return_value)
+        self._log.assertMessages(expected_log_messages)
+        self._mock_os.assertCurrentDirectory(expected_current_directory)
+
+    def test_checkout_root_none_paths_none(self):
+        self.assertRaises(Exception, self._change_directory,
+                          checkout_root=None, paths=None)
+        self._log.assertMessages([])
+        self._mock_os.assertCurrentDirectory(self._original_directory)
+
+    def test_checkout_root_none(self):
+        paths = self._change_directory(checkout_root=None,
+                                       paths=["path1"])
+        log_messages = [
+"""WARNING: WebKit checkout root not found:
+  Path-dependent style checks may not work correctly.
+  See the help documentation for more info.
+"""]
+        self._assert_result(paths, ["path1"], log_messages,
+                            self._original_directory)
+
+    def test_paths_none(self):
+        paths = self._change_directory(checkout_root=self._checkout_root,
+                                       paths=None)
+        self._assert_result(paths, None, [], self._checkout_root)
+
+    def test_paths_convertible(self):
+        paths=["/WebKit/foo1.txt",
+               "/WebKit/foo2.txt"]
+        paths = self._change_directory(checkout_root=self._checkout_root,
+                                       paths=paths)
+        self._assert_result(paths, ["foo1.txt", "foo2.txt"], [],
+                            self._checkout_root)
+
+    def test_with_scm_paths_unconvertible(self):
+        paths=["/WebKit/foo1.txt",
+               "/outside/foo2.txt"]
+        paths = self._change_directory(checkout_root=self._checkout_root,
+                                       paths=paths)
+        log_messages = [
+"""WARNING: Path-dependent style checks may not work correctly:
+
+  One of the given paths is outside the WebKit checkout of the current
+  working directory:
+
+    Path: /outside/foo2.txt
+    Checkout root: /WebKit
+
+  Pass only files below the checkout root to ensure correct results.
+  See the help documentation for more info.
+
+"""]
+        self._assert_result(paths, paths, log_messages,
+                            self._original_directory)