2 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
3 # Use of this source code is governed by a BSD-style license that can be
4 # found in the LICENSE file.
8 import pyauto_functional # Must be imported before pyauto
11 from chromeos.power_strip import PowerStrip
13 class ChromeosBattery(pyauto.PyUITest):
14 """Tests ChromeOS Battery Status.
17 1) Device under test (DUT) is connected to the LAN via an
18 Ethernet-to-USB adapter plugged into one of its USB ports.
19 2) AC power cable is connected to the DUT, and plugged into
20 the IP controlled Power Switch, outlet #4, located in the lab.
21 3) Battery is installed in the DUT, and battery is not fully
23 4) Tester should have physical access to the power switch.
25 Note about time calculation:
26 When AC power is turned off or on, the battery will take from 2
27 to 60 seconds to calculate the time remaining to empty or full.
28 While calculating, the keys 'battery_time_to_full' and
29 'battery_time_to_empty' are absent.
32 _BATTERY_CONFIG_FILE = os.path.join(pyauto.PyUITest.DataDir(),
33 'pyauto_private', 'chromeos', 'power',
34 'battery_testbed_config')
37 pyauto.PyUITest.setUp(self)
41 # Leave AC power ON so battery does not discharge between tests
42 self._power_strip.PowerOn(self._outlet_battery_full)
43 pyauto.PyUITest.tearDown(self)
45 def InitPowerStrip(self):
46 assert os.path.exists(ChromeosBattery._BATTERY_CONFIG_FILE), \
47 'Power Strip configuration file does not exist.'
48 power_config = pyauto.PyUITest.EvalDataFrom(
49 ChromeosBattery._BATTERY_CONFIG_FILE)
50 self._power_strip = PowerStrip(power_config['strip_ip'])
51 self._outlet_battery_full = (power_config['configs']
55 def WaitUntilBatteryState(self, ac_power_on, time_key):
56 assert self.WaitUntil(lambda: self.BatteryPowerAndChargeStateAgree(
57 ac_power_on, time_key), timeout=60, retry_sleep=1), \
58 'Battery charge/discharge time was not calculated.'
61 def BatteryPowerAndChargeStateAgree(self, ac_power_on, time_key):
62 battery_status = self.GetBatteryInfo()
63 return (battery_status.get('line_power_on') == ac_power_on and
64 time_key in battery_status)
66 def testBatteryChargesWhenACisOn(self):
67 """Calculate battery time to full when AC is ON"""
68 # Apply AC power to chromebook with battery.
69 self._power_strip.PowerOn(self._outlet_battery_full)
71 # Get info about charging battery
72 self.WaitUntilBatteryState(True,'battery_time_to_full')
73 battery_status = self.GetBatteryInfo()
74 self.assertTrue(battery_status.get('battery_is_present'),
75 msg='Battery is not present.')
76 self.assertTrue(battery_status.get('line_power_on'),
77 msg='Line power is off.')
78 self.assertTrue(battery_status.get('battery_time_to_full') >= 0,
79 msg='Battery charge time is negative.')
81 def testBatteryDischargesWhenACisOff(self):
82 """Calculate battery time to empty when AC is OFF"""
83 self._power_strip.PowerOff(self._outlet_battery_full)
85 # Get info about discharging battery
86 self.WaitUntilBatteryState(False,'battery_time_to_empty')
87 battery_status = self.GetBatteryInfo()
88 self.assertTrue(battery_status.get('battery_is_present'),
89 msg='Battery is not present.')
90 self.assertFalse(battery_status.get('line_power_on'),
91 msg='Line power is on.')
92 self.assertTrue(battery_status.get('battery_time_to_empty') >= 0,
93 msg='Battery discharge time is negative.')
95 def testBatteryTimesAreDifferent(self):
96 """Time to full and time to empty should be different"""
98 self._power_strip.PowerOn(self._outlet_battery_full)
100 # Get charging battery time to full
101 self.WaitUntilBatteryState(True,'battery_time_to_full')
102 battery_status = self.GetBatteryInfo()
103 time_to_full = battery_status.get('battery_time_to_full')
106 self._power_strip.PowerOff(self._outlet_battery_full)
108 # Get discharging battery time to empty
109 self.WaitUntilBatteryState(False,'battery_time_to_empty')
110 battery_status = self.GetBatteryInfo()
111 time_to_empty = battery_status.get('battery_time_to_empty')
113 # Compare charge to discharge time
114 """Confirm that time to full and time to empty are not
115 returning the same value, but that the values are
116 different (e.g., both are not zero)."""
117 self.assertNotEqual(time_to_full, time_to_empty,
118 msg='Battery time to full equals time to empty. '
119 'Though very unlikely, this is not impossible. '
120 'If test failed falsely, Kris owes Scott a beer.')
123 if __name__ == '__main__':
124 pyauto_functional.Main()