remove stale test data on the device

build/android/pylib/device/device_utils_test.py

 #!/usr/bin/env python
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
 Unit tests for the contents of device_utils.py (mostly DeviceUtils).
 """
 
 # pylint: disable=C0321
@@ skipping 1126 matching lines @@
 
   def testPushChangedFilesZipped_single(self):
     self._testPushChangedFilesZipped_spec(
         [('/test/host/path/file1', '/test/device/path/file1')])
 
   def testPushChangedFilesZipped_multiple(self):
     self._testPushChangedFilesZipped_spec(
         [('/test/host/path/file1', '/test/device/path/file1'),
          ('/test/host/path/file2', '/test/device/path/file2')])
 
+class DeviceUtilsDeleteStaleFilesTest(DeviceUtilsTest):
+
+  def testDeleteStaleFiles_emtpy(self):
+    files = []
+    with self.assertCalls():
+      self.device._DeleteStaleFiles(files)
+
+  def testDeleteStaleFiles_single(self):
+    files = ['/test/device/path/file1']
+    with self.assertCalls((self.call.adb.Shell(
+        'rm /test/device/path/file1'), '')):
+      self.device._DeleteStaleFiles(files)
+
+  def testDeleteStaleFiles_multiple(self):
+    files = ['/test/device/path/file1', '/test/device/path/file2']
+    with self.assertCalls(
+        (self.call.adb.Shell('rm /test/device/path/file1'), ''),
+        (self.call.adb.Shell('rm /test/device/path/file2'), '')):
+      self.device._DeleteStaleFiles(files)
 
 class DeviceUtilsFileExistsTest(DeviceUtilsTest):
 
   def testFileExists_usingTest_fileExists(self):
     with self.assertCall(
         self.call.device.RunShellCommand(
             ['test', '-e', '/path/file.exists'], check_return=True), ''):
       self.assertTrue(self.device.FileExists('/path/file.exists'))
 
   def testFileExists_usingTest_fileDoesntExist(self):
@@ skipping 523 matching lines @@
       devices = device_utils.DeviceUtils.HealthyDevices()
     self.assertEquals(1, len(devices))
     self.assertTrue(isinstance(devices[0], device_utils.DeviceUtils))
     self.assertEquals('0123456789abcdef', devices[0].adb.GetDeviceSerial())
 
 
 if __name__ == '__main__':
   logging.getLogger().setLevel(logging.DEBUG)
   unittest.main(verbosity=2)