webkitpy: Remove contents of directory.

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

Index: third_party/WebKit/Tools/Scripts/webkitpy/common/system/filesystem_unittest.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/common/system/filesystem_unittest.py b/third_party/WebKit/Tools/Scripts/webkitpy/common/system/filesystem_unittest.py
index 9318ca031f0753a3aafdb8ba25dbfb95a85052c4..858c47c8549a447eecd81df4bb3d7d9380bdf4bf 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/common/system/filesystem_unittest.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/common/system/filesystem_unittest.py
@@ -119,6 +119,15 @@ class GenericFileSystemTests(object):
         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/')