[Android] Tune DeviceUtils commands that are prone to large outputs.

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 624 matching lines @@
         (mock.call.pylib.constants.GetOutDirectory(), '/foo/bar'),
         (mock.call.os.path.exists(mock.ANY), True),
         (self.call.adb.Push(mock.ANY, mock.ANY), '')):
       self.assertNotEqual('', self.device.GetDevicePieWrapper())
 
 
 @mock.patch('time.sleep', mock.Mock())
 class DeviceUtilsKillAllTest(DeviceUtilsTest):
 
   def testKillAll_noMatchingProcesses(self):
-    with self.assertCall(self.call.adb.Shell('ps'),
-        'USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME\n'):
+    with self.assertCall(self.call.device.GetPids('test_process'), []):
       with self.assertRaises(device_errors.CommandFailedError):
         self.device.KillAll('test_process')
 
   def testKillAll_nonblocking(self):
     with self.assertCalls(
-        (self.call.adb.Shell('ps'),
-         'USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME\n'
-         'u0_a1  1234  174   123456 54321 ffffffff 456789ab some.process\n'),
+        (self.call.device.GetPids('some.process'), {'some.process': '1234'}),
         (self.call.adb.Shell('kill -9 1234'), '')):
-      self.assertEquals(1,
-          self.device.KillAll('some.process', blocking=False))
+      self.assertEquals(
+          1, self.device.KillAll('some.process', blocking=False))
 
   def testKillAll_blocking(self):
     with self.assertCalls(
-        (self.call.adb.Shell('ps'),
-         'USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME\n'
-         'u0_a1  1234  174   123456 54321 ffffffff 456789ab some.process\n'),
+        (self.call.device.GetPids('some.process'), {'some.process': '1234'}),
         (self.call.adb.Shell('kill -9 1234'), ''),
-        (self.call.adb.Shell('ps'),
-         'USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME\n'
-         'u0_a1  1234  174   123456 54321 ffffffff 456789ab some.process\n'),
-        (self.call.adb.Shell('ps'),
-         'USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME\n')):
-      self.assertEquals(1,
-          self.device.KillAll('some.process', blocking=True))
+        (self.call.device.GetPids('some.process'), {'some.process': '1234'}),
+        (self.call.device.GetPids('some.process'), [])):
+      self.assertEquals(
+          1, self.device.KillAll('some.process', blocking=True))
 
   def testKillAll_root(self):
     with self.assertCalls(
-        (self.call.adb.Shell('ps'),
-         'USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME\n'
-         'u0_a1  1234  174   123456 54321 ffffffff 456789ab some.process\n'),
+        (self.call.device.GetPids('some.process'), {'some.process': '1234'}),
         (self.call.device.NeedsSU(), True),
         (self.call.adb.Shell("su -c sh -c 'kill -9 1234'"), '')):
-      self.assertEquals(1,
-          self.device.KillAll('some.process', as_root=True))
+      self.assertEquals(
+          1, self.device.KillAll('some.process', as_root=True))
 
   def testKillAll_sigterm(self):
     with self.assertCalls(
-        (self.call.adb.Shell('ps'),
-         'USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME\n'
-         'u0_a1  1234  174   123456 54321 ffffffff 456789ab some.process\n'),
+        (self.call.device.GetPids('some.process'), {'some.process': '1234'}),
         (self.call.adb.Shell('kill -15 1234'), '')):
-      self.assertEquals(1,
-          self.device.KillAll('some.process', signum=signal.SIGTERM))
+      self.assertEquals(
+          1, self.device.KillAll('some.process', signum=signal.SIGTERM))
 
 
 class DeviceUtilsStartActivityTest(DeviceUtilsTest):
 
   def testStartActivity_actionOnly(self):
     test_intent = intent.Intent(action='android.intent.action.VIEW')
     with self.assertCall(
         self.call.adb.Shell('am start '
                             '-a android.intent.action.VIEW'),
         'Starting: Intent { act=android.intent.action.VIEW }'):
@@ skipping 407 matching lines @@
       with self.assertRaises(device_errors.CommandFailedError):
         self.device._ReadFileWithPull('/path/to/device/file')
 
   def testReadFile_exists(self):
     with self.assertCalls(
         (self.call.device.RunShellCommand(
             ['ls', '-l', '/read/this/test/file'],
             as_root=False, check_return=True),
          ['-rw-rw---- root foo 256 1970-01-01 00:00 file']),
         (self.call.device.RunShellCommand(
-            ['cat', '/read/this/test/file'], as_root=False, check_return=True),
+            ['cat', '/read/this/test/file'],
+            as_root=False, check_return=True, large_output=False),
          ['this is a test file'])):
       self.assertEqual('this is a test file\n',
                        self.device.ReadFile('/read/this/test/file'))
 
   def testReadFile_doesNotExist(self):
     with self.assertCall(
         self.call.device.RunShellCommand(
             ['ls', '-l', '/this/file/does.not.exist'],
             as_root=False, check_return=True),
         self.CommandError('File does not exist')):
       with self.assertRaises(device_errors.CommandFailedError):
         self.device.ReadFile('/this/file/does.not.exist')
 
+  def testReadFile_zeroSize(self):
+    with self.assertCalls(
+        (self.call.device.RunShellCommand(
+            ['ls', '-l', '/this/file/has/zero/size'],
+            as_root=False, check_return=True),
+         ['-r--r--r-- root foo 0 1970-01-01 00:00 zero_size_file']),
+        (self.call.device.RunShellCommand(
+            ['cat', '/this/file/has/zero/size'],
+            as_root=False, check_return=True, large_output=True),
+         ['but it has contents'])):
+      self.assertEqual('but it has contents\n',
+                       self.device.ReadFile('/this/file/has/zero/size'))
+
   def testReadFile_withSU(self):
     with self.assertCalls(
         (self.call.device.RunShellCommand(
             ['ls', '-l', '/this/file/can.be.read.with.su'],
             as_root=True, check_return=True),
          ['-rw------- root root 256 1970-01-01 00:00 can.be.read.with.su']),
         (self.call.device.RunShellCommand(
             ['cat', '/this/file/can.be.read.with.su'],
-            as_root=True, check_return=True),
+            as_root=True, check_return=True, large_output=False),
          ['this is a test file', 'read with su'])):
       self.assertEqual(
           'this is a test file\nread with su\n',
           self.device.ReadFile('/this/file/can.be.read.with.su',
                                as_root=True))
 
   def testReadFile_withPull(self):
     contents = 'a' * 123456
     with self.assertCalls(
         (self.call.device.RunShellCommand(
@@ skipping 229 matching lines @@
     with self.assertCalls(
         (self.call.adb.Shell('setprop test.property new_value'), ''),
         (self.call.adb.Shell('getprop test.property'), 'old_value')):
       with self.assertRaises(device_errors.CommandFailedError):
         self.device.SetProp('test.property', 'new_value', check=True)
 
 
 class DeviceUtilsGetPidsTest(DeviceUtilsTest):
 
   def testGetPids_noMatches(self):
-    with self.assertCall(self.call.adb.Shell('ps'),
-        'USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME\n'
-        'user  1000    100   1024 1024   ffffffff 00000000 no.match\n'):
+    with self.assertCall(
+        self.call.device.RunShellCommand(
+            'ps', check_return=True, large_output=True),
+        ['USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME',
+         'user  1000    100   1024 1024   ffffffff 00000000 no.match']):
       self.assertEqual({}, self.device.GetPids('does.not.match'))
 
   def testGetPids_oneMatch(self):
-    with self.assertCall(self.call.adb.Shell('ps'),
-        'USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME\n'
-        'user  1000    100   1024 1024   ffffffff 00000000 not.a.match\n'
-        'user  1001    100   1024 1024   ffffffff 00000000 one.match\n'):
+    with self.assertCall(
+        self.call.device.RunShellCommand(
+            'ps', check_return=True, large_output=True),
+        ['USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME',
+         'user  1000    100   1024 1024   ffffffff 00000000 not.a.match',
+         'user  1001    100   1024 1024   ffffffff 00000000 one.match']):
       self.assertEqual({'one.match': '1001'}, self.device.GetPids('one.match'))
 
   def testGetPids_mutlipleMatches(self):
-    with self.assertCall(self.call.adb.Shell('ps'),
-        'USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME\n'
-        'user  1000    100   1024 1024   ffffffff 00000000 not\n'
-        'user  1001    100   1024 1024   ffffffff 00000000 one.match\n'
-        'user  1002    100   1024 1024   ffffffff 00000000 two.match\n'
-        'user  1003    100   1024 1024   ffffffff 00000000 three.match\n'):
+    with self.assertCall(
+        self.call.device.RunShellCommand(
+            'ps', check_return=True, large_output=True),
+        ['USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME',
+         'user  1000    100   1024 1024   ffffffff 00000000 not',
+         'user  1001    100   1024 1024   ffffffff 00000000 one.match',
+         'user  1002    100   1024 1024   ffffffff 00000000 two.match',
+         'user  1003    100   1024 1024   ffffffff 00000000 three.match']):
       self.assertEqual(
           {'one.match': '1001', 'two.match': '1002', 'three.match': '1003'},
           self.device.GetPids('match'))
 
   def testGetPids_exactMatch(self):
-    with self.assertCall(self.call.adb.Shell('ps'),
-        'USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME\n'
-        'user  1000    100   1024 1024   ffffffff 00000000 not.exact.match\n'
-        'user  1234    100   1024 1024   ffffffff 00000000 exact.match\n'):
+    with self.assertCall(
+        self.call.device.RunShellCommand(
+            'ps', check_return=True, large_output=True),
+        ['USER   PID   PPID  VSIZE  RSS   WCHAN    PC       NAME',
+         'user  1000    100   1024 1024   ffffffff 00000000 not.exact.match',
+         'user  1234    100   1024 1024   ffffffff 00000000 exact.match']):
       self.assertEqual(
           {'not.exact.match': '1000', 'exact.match': '1234'},
           self.device.GetPids('exact.match'))
 
 
 class DeviceUtilsTakeScreenshotTest(DeviceUtilsTest):
 
   def testTakeScreenshot_fileNameProvided(self):
     with self.assertCalls(
         (mock.call.pylib.utils.device_temp_file.DeviceTempFile(
             self.adb, suffix='.png'),
          MockTempFile('/tmp/path/temp-123.png')),
         (self.call.adb.Shell('/system/bin/screencap -p /tmp/path/temp-123.png'),
          ''),
         self.call.device.PullFile('/tmp/path/temp-123.png',
                                   '/test/host/screenshot.png')):
       self.device.TakeScreenshot('/test/host/screenshot.png')
 
 
 class DeviceUtilsGetMemoryUsageForPidTest(DeviceUtilsTest):
 
   def setUp(self):
     super(DeviceUtilsGetMemoryUsageForPidTest, self).setUp()
 
   def testGetMemoryUsageForPid_validPid(self):
     with self.assertCalls(
         (self.call.device.RunShellCommand(
-            ['showmap', '1234'], as_root=True, check_return=True),
+            ['showmap', '1234'],
+            as_root=True, check_return=True, large_output=True),
          ['100 101 102 103 104 105 106 107 TOTAL']),
         (self.call.device.ReadFile('/proc/1234/status', as_root=True),
          'VmHWM: 1024 kB\n')):
       self.assertEqual(
           {
             'Size': 100,
             'Rss': 101,
             'Pss': 102,
             'Shared_Clean': 103,
             'Shared_Dirty': 104,
             'Private_Clean': 105,
             'Private_Dirty': 106,
             'VmHWM': 1024
           },
           self.device.GetMemoryUsageForPid(1234))
 
   def testGetMemoryUsageForPid_noSmaps(self):
     with self.assertCalls(
         (self.call.device.RunShellCommand(
-            ['showmap', '4321'], as_root=True, check_return=True),
+            ['showmap', '4321'],
+            as_root=True, check_return=True, large_output=True),
          ['cannot open /proc/4321/smaps: No such file or directory']),
         (self.call.device.ReadFile('/proc/4321/status', as_root=True),
          'VmHWM: 1024 kb\n')):
       self.assertEquals({'VmHWM': 1024}, self.device.GetMemoryUsageForPid(4321))
 
   def testGetMemoryUsageForPid_noStatus(self):
     with self.assertCalls(
         (self.call.device.RunShellCommand(
-            ['showmap', '4321'], as_root=True, check_return=True),
+            ['showmap', '4321'],
+            as_root=True, check_return=True, large_output=True),
          ['100 101 102 103 104 105 106 107 TOTAL']),
         (self.call.device.ReadFile('/proc/4321/status', as_root=True),
          self.CommandError())):
       self.assertEquals(
           {
             'Size': 100,
             'Rss': 101,
             'Pss': 102,
             'Shared_Clean': 103,
             'Shared_Dirty': 104,
@@ skipping 55 matching lines @@
     self.assertEqual(client_cache_one, {'test': 1})
     self.assertEqual(client_cache_two, {'test': 1})
     self.device._ClearCache()
     self.assertEqual(client_cache_one, {})
     self.assertEqual(client_cache_two, {})
 
 if __name__ == '__main__':
   logging.getLogger().setLevel(logging.DEBUG)
   unittest.main(verbosity=2)