generation_test.py revision 16d7a5204e347855b1c3a68c982c22f931a12866
1# Copyright (c) 2013 The Chromium OS Authors. All rights reserved. 2# Use of this source code is governed by a BSD-style license that can be 3# found in the LICENSE file. 4 5"""Generation unittest. 6 7Part of the Chrome build flags optimization. 8""" 9 10__author__ = 'yuhenglong@google.com (Yuheng Long)' 11 12import random 13import unittest 14 15from generation import Generation 16from mock_task import MockTask 17 18 19# Pick an integer at random. 20TESTSTAGE = -125 21 22# The number of tasks to be put in a generation to be tested. 23NUMTASKS = 20 24 25# The stride of permutation used to shuffle the input list of tasks. Should be 26# relatively prime with NUMTASKS. 27STRIDE = 7 28 29 30class GenerationMockTask(MockTask): 31 """This class defines the mock task to test the Generation class. 32 33 The task instances will be inserted into a set. Therefore the hash and the 34 equal methods are overridden. The generation class considers the identifier to 35 set the cost of the task in a set, thus the identifier is used in the 36 overriding methods. 37 """ 38 39 def __hash__(self): 40 return self._identifier 41 42 def __eq__(self, other): 43 if isinstance(other, MockTask): 44 return self._identifier == other.GetIdentifier(self._stage) 45 return False 46 47 48class GenerationTest(unittest.TestCase): 49 """This class test the Generation class. 50 51 Given a set of tasks in the generation, if there is any task that is pending, 52 then the Done method will return false, and true otherwise. 53 """ 54 55 def testDone(self): 56 """"Test the Done method. 57 58 Produce a generation with a set of tasks. Set the cost of the task one by 59 one and verify that the Done method returns false before setting the cost 60 for all the tasks. After the costs of all the tasks are set, the Done method 61 should return true. 62 """ 63 64 random.seed(0) 65 66 testing_tasks = range(NUMTASKS) 67 68 # The tasks for the generation to be tested. 69 generation_tasks = [GenerationMockTask(TESTSTAGE, t) for t in testing_tasks] 70 71 gen = Generation(set(generation_tasks), None) 72 73 # Permute the list. 74 permutation = [(t * STRIDE) % NUMTASKS for t in range(NUMTASKS)] 75 permuted_tasks = [testing_tasks[index] for index in permutation] 76 77 # The Done method of the Generation should return false before all the tasks 78 # in the permuted list are set. 79 for testing_task in permuted_tasks: 80 assert not gen.Done() 81 82 # Mark a task as done by calling the UpdateTask method of the generation. 83 # Send the generation the task as well as its results. 84 gen.UpdateTask(GenerationMockTask(TESTSTAGE, testing_task)) 85 86 # The Done method should return true after all the tasks in the permuted 87 # list is set. 88 assert gen.Done() 89 90if __name__ == '__main__': 91 unittest.main() 92