[Telemetry] Small fixes in android_app_backend

tools/telemetry/telemetry/internal/backends/android_app_backend_unittest.py

Index: tools/telemetry/telemetry/internal/backends/android_app_backend_unittest.py
diff --git a/tools/telemetry/telemetry/internal/backends/android_app_backend_unittest.py b/tools/telemetry/telemetry/internal/backends/android_app_backend_unittest.py
new file mode 100644
index 0000000000000000000000000000000000000000..8140e894c1d6c151709b42fe29c3494399da6f23
--- /dev/null
+++ b/tools/telemetry/telemetry/internal/backends/android_app_backend_unittest.py
@@ -0,0 +1,38 @@
+# Copyright 2016 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.
+import collections
+import mock
+import unittest
+
+from telemetry.internal.backends import android_app_backend
+from devil.android.sdk import intent as intent_module
+
+
+_FakeAndroidProcess = collections.namedtuple(
+    'AndroidProcess', ['app_backend', 'pid', 'name'])
+
+
+class AndroidAppBackendUnittest(unittest.TestCase):
+
+  def setUp(self):
+    self.platform_backend = mock.Mock()
+    self.start_intent = intent_module.Intent(
+        package='com.example.my_app',
+        activity='com.example.my_app.LaunchMyApp')
+    self.app_backend = android_app_backend.AndroidAppBackend(
+        self.platform_backend, self.start_intent)
+
+  @mock.patch('telemetry.internal.backends.android_app_backend'
+              '.android_process.AndroidProcess', _FakeAndroidProcess)
+  def testGetProcesses(self):
+    # Only processes belonging to 'com.example.my_app' should match.
+    self.platform_backend.GetPsOutput.return_value = [
+      ['1111', 'com.example.my_app'],
+      ['2222', 'com.example.my_appointments_helper'],
+      ['3333', 'com.example.my_app:service'],
+      ['4444', 'com.example.some_other_app'],
+      ['5555', 'com_example_my_app'],
+    ]
+    process_pids = set(p.pid for p in self.app_backend.GetProcesses())
+    self.assertEquals(process_pids, set(['1111', '3333']))