Provide a maximum size on the number of tests to run in one group.

build/android/pylib/base/test_dispatcher_unittest.py

 # Copyright 2013 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.
 
 """Unittests for test_dispatcher.py."""
 # pylint: disable=R0201
 # pylint: disable=W0212
 
 import os
 import sys
 import unittest
 
 sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)),
                 os.pardir, os.pardir))
 
 # Mock out android_commands.GetAttachedDevices().
 from pylib import android_commands
 android_commands.GetAttachedDevices = lambda: ['0', '1']
 from pylib import constants
 from pylib.base import base_test_result
 from pylib.base import test_dispatcher
 from pylib.utils import watchdog_timer
 
 
-
 class TestException(Exception):
   pass
 
 
 class MockRunner(object):
   """A mock TestRunner."""
   def __init__(self, device='0', shard_index=0):
     self.device_serial = device
     self.shard_index = shard_index
     self.setups = 0
@@ skipping 77 matching lines @@
     counter = test_dispatcher._ThreadSafeCounter()
     test_dispatcher._SetUp(MockRunner, '0', runners, counter)
     self.assertEqual(len(runners), 1)
     self.assertEqual(runners[0].setups, 1)
 
   def testThreadSafeCounter(self):
     counter = test_dispatcher._ThreadSafeCounter()
     for i in xrange(5):
       self.assertEqual(counter.GetAndIncrement(), i)
 
+  def testApplyMaxPerRun(self):
+    self.assertEqual(
+        ['A:B', 'C:D', 'E', 'F:G', 'H:I'],
+        test_dispatcher.ApplyMaxPerRun(['A:B', 'C:D:E', 'F:G:H:I'], 2))
+
 
 class TestThreadGroupFunctions(unittest.TestCase):
   """Tests test_dispatcher._RunAllTests and test_dispatcher._CreateRunners."""
   def setUp(self):
     self.tests = ['a', 'b', 'c', 'd', 'e', 'f', 'g']
     shared_test_collection = test_dispatcher._TestCollection(
         [test_dispatcher._Test(t) for t in self.tests])
     self.test_collection_factory = lambda: shared_test_collection
 
   def testCreate(self):
@@ skipping 48 matching lines @@
     self.assertEqual(len(results.GetPass()), 0)
     self.assertEqual(len(results.GetFail()), 3)
     self.assertEqual(exit_code, constants.ERROR_EXIT_CODE)
 
   def testNoTests(self):
     results, exit_code = test_dispatcher.RunTests(
         [], MockRunner, ['0', '1'], shard=True)
     self.assertEqual(len(results.GetAll()), 0)
     self.assertEqual(exit_code, constants.ERROR_EXIT_CODE)
 
-  def testTestsRemainWithAllDevicesOffline(self):
-    attached_devices = android_commands.GetAttachedDevices
-    android_commands.GetAttachedDevices = lambda: []
-    try:
-      with self.assertRaises(AssertionError):
-        _results, _exit_code = TestShard._RunShard(MockRunner)
-    finally:
-      android_commands.GetAttachedDevices = attached_devices
-
 
 class TestReplicate(unittest.TestCase):
   """Tests test_dispatcher.RunTests with replication."""
   @staticmethod
   def _RunReplicate(runner_factory):
     return test_dispatcher.RunTests(
         ['a', 'b', 'c'], runner_factory, ['0', '1'], shard=False)
 
   def testReplicate(self):
     results, exit_code = TestReplicate._RunReplicate(MockRunner)
     # We expect 6 results since each test should have been run on every device
     self.assertEqual(len(results.GetPass()), 6)
     self.assertEqual(exit_code, 0)
 
   def testFailing(self):
     results, exit_code = TestReplicate._RunReplicate(MockRunnerFail)
     self.assertEqual(len(results.GetPass()), 0)
     self.assertEqual(len(results.GetFail()), 6)
     self.assertEqual(exit_code, constants.ERROR_EXIT_CODE)
 
   def testNoTests(self):
     results, exit_code = test_dispatcher.RunTests(
         [], MockRunner, ['0', '1'], shard=False)
     self.assertEqual(len(results.GetAll()), 0)
     self.assertEqual(exit_code, constants.ERROR_EXIT_CODE)
 
 
 if __name__ == '__main__':
   unittest.main()