webkitpy: Remove contents of directory.

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

 # vim: set fileencoding=utf-8 :
 # Copyright (C) 2010 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #    * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #    * Redistributions in binary form must reproduce the above
@@ skipping 101 matching lines @@
 
     def test_rmtree(self):
         self.fs.chdir(self.generic_test_dir)
         self.fs.rmtree('foo')
         self.assertTrue(self.fs.exists('foodir'))
         self.assertTrue(self.fs.exists(self.fs.join('foodir', 'baz')))
         self.fs.rmtree('foodir')
         self.assertFalse(self.fs.exists('foodir'))
         self.assertFalse(self.fs.exists(self.fs.join('foodir', 'baz')))
 
+    def test_remove_contents(self):
+        self.fs.chdir(self.generic_test_dir)
+
+        self.assertTrue(self.fs.exists('foodir'))
+        self.assertTrue(self.fs.exists(self.fs.join('foodir', 'baz')))
+        self.assertTrue(self.fs.remove_contents('foodir'))
+        self.assertTrue(self.fs.exists('foodir'))
+        self.assertFalse(self.fs.exists(self.fs.join('foodir', 'baz')))
+
     def test_copytree(self):
         self.fs.chdir(self.generic_test_dir)
         self.fs.copytree('foodir/', 'bardir/')
         self.assertTrue(self.fs.exists('bardir'))
         self.assertTrue(self.fs.exists(self.fs.join('bardir', 'baz')))
 
     def test_move(self):
         self.fs.chdir(self.generic_test_dir)
         self.fs.move('foo.txt', 'bar.txt')
         self.assertFalse(self.fs.exists('foo.txt'))
@@ skipping 187 matching lines @@
         fs = FileSystem()
         self.assertTrue(fs.remove('filename', remove_with_exception))
         self.assertEqual(-1, RealFileSystemTest._remove_failures)
 
     def test_sep(self):
         fs = FileSystem()
 
         self.assertEqual(fs.sep, os.sep)
         self.assertEqual(fs.join('foo', 'bar'),
                          os.path.join('foo', 'bar'))