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1#!/usr/bin/python
2#
3# Copyright 2015 The Chromium OS Authors. All rights reserved.
4# Use of this source code is governed by a BSD-style license that can be
5# found in the LICENSE file.
6
7"""Unittests for server/cros/dynamic_suite/frontend_wrappers.py"""
8
9import mox
10import unittest
11
12import common
13
14from autotest_lib.server.cros.dynamic_suite import frontend_wrappers
15
16
17class FrontendWrappersTest(mox.MoxTestBase):
18  """Unit tests for frontend_wrappers global functions."""
19
20  def testConvertTimeoutToRetryBasic(self):
21    """Test converting timeout and delay values to retry attempts."""
22    backoff = 2
23    timeout_min = 10
24    delay_sec = 10
25
26    max_retry = frontend_wrappers.convert_timeout_to_retry(backoff,
27                                                           timeout_min,
28                                                           delay_sec)
29
30    self.assertEquals(max_retry, 6)
31
32  def testConvertTimeoutToRetryLimit(self):
33    """Test approaching a change in attempt amount."""
34    backoff = 2
35    delay_sec = 10
36    timeout_min_lower_limit = 42.499999
37    timeout_min_at_limit = 42.5
38    timeout_min_upper_limit = 42.599999
39
40    max_retry_lower_limit = frontend_wrappers.convert_timeout_to_retry(
41        backoff, timeout_min_lower_limit, delay_sec)
42
43    max_retry_at_limit = frontend_wrappers.convert_timeout_to_retry(
44        backoff, timeout_min_at_limit, delay_sec)
45
46    max_retry_upper_limit = frontend_wrappers.convert_timeout_to_retry(
47        backoff, timeout_min_upper_limit, delay_sec)
48
49    # Eight attempts with a backoff factor of two should be sufficient
50    # for timeouts up to 2550 seconds (or 42.5 minutes).
51    self.assertEquals(max_retry_lower_limit, 8)
52    self.assertEquals(max_retry_at_limit, 8)
53
54    # We expect to see nine attempts, as we are above the 42.5 minute
55    # threshold.
56    self.assertEquals(max_retry_upper_limit, 9)
57
58  def testConvertTimeoutToRetrySmallTimeout(self):
59    """Test converting to retry attempts when a small timeout is used."""
60    backoff = 2
61    timeout_min = 0.01
62    delay_sec = 10
63
64    max_retry = frontend_wrappers.convert_timeout_to_retry(backoff,
65                                                           timeout_min,
66                                                           delay_sec)
67
68    # The number of attempts should be less than one using the formula
69    # outlined in the function, but, we always round up to the nearest
70    # integer.
71    self.assertEquals(max_retry, 1)
72
73  def testConvertTimeoutToRetrySmallDelay(self):
74    """Test converting to retry attempts when the delay is small."""
75    backoff = 2
76    timeout_min = 30
77    delay_sec = 0.01
78
79    max_retry = frontend_wrappers.convert_timeout_to_retry(backoff,
80                                                           timeout_min,
81                                                           delay_sec)
82
83    # The number of retries shouldn't be too large despite the small
84    # delay as a result of backing off in an exponential fashion.
85    self.assertEquals(max_retry, 18)
86
87
88if __name__ == '__main__':
89    unittest.main()
90