Add file permissions to filesystem_mock

third_party/WebKit/Tools/Scripts/webkitpy/common/system/filesystem_mock_unittest.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/common/system/filesystem_mock_unittest.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/common/system/filesystem_mock_unittest.py b/third_party/WebKit/Tools/Scripts/webkitpy/common/system/filesystem_mock_unittest.py
index 42d83c0a516dd38bc64e3c377de012bf2e1e7aa7..b098a7e667e810a6682d84ca7ccced3621835cf6 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/common/system/filesystem_mock_unittest.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/common/system/filesystem_mock_unittest.py
@@ -111,3 +111,14 @@ class MockFileSystemTest(unittest.TestCase, filesystem_unittest.GenericFileSyste
                                                            ('foo/a', ['z'], ['x', 'y']),
                                                            ('foo/a/z', [], ['lyrics']),
                                                            ('foo/bar', [], ['quux', 'baz'])])
+
+    def test_chmod(self):
+        host = MockHost()
+        path = 'foo'
+        path2 = 'bar'

[qyearsley, 2016/06/14 21:47:02]

It would be better to put these strings literals directly where they are used.

Also, names like `path2` are a signal that the thing probably doesn't need a
name.

+        mock_files = {'foo': '',
+                      'bar': ''}

[qyearsley, 2016/06/14 21:47:02]

Formatting nit: This fits on one line pretty easily, and I think it's just as
easy to read if it's on one line.

+        host.filesystem = MockFileSystem(files=mock_files)
+        host.filesystem.chmod(path, 444)
+        host.filesystem.chmod(path2, 343)
+        self.assertEquals(host.filesystem.perms, {'bar': '--wxr---wx', 'foo': '-r--r--r--'})