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# 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.
import unittest
from metrics import cpu
# Testing private method.
# pylint: disable=W0212
class CpuMetricTest(unittest.TestCase):
def testSubtractCpuStats(self):
# The result computed is a ratio of cpu time used to time elapsed.
start = {'Browser': {'CpuProcessTime': 0, 'TotalTime': 0}}
end = {'Browser': {'CpuProcessTime': 5, 'TotalTime': 20}}
self.assertEqual({'Browser': 0.25}, cpu._SubtractCpuStats(end, start))
# An error is thrown if the args are called in the wrong order.
self.assertRaises(AssertionError, cpu._SubtractCpuStats, start, end)
# An error is thrown if there's a process type in end that's not in start.
end['Renderer'] = {'CpuProcessTime': 2, 'TotalTime': 20}
self.assertRaises(AssertionError, cpu._SubtractCpuStats, end, start)
# A process type will be ignored if there's an empty dict for start or end.
start['Renderer'] = {}
self.assertEqual({'Browser': 0.25}, cpu._SubtractCpuStats(end, start))
# Results for multiple process types can be computed.
start['Renderer'] = {'CpuProcessTime': 0, 'TotalTime': 0}
self.assertEqual({'Browser': 0.25, 'Renderer': 0.1},
cpu._SubtractCpuStats(end, start))
# Test 32-bit overflow.
start = {'Browser': {'CpuProcessTime': 0, 'TotalTime': 2**32 - 20}}
end = {'Browser': {'CpuProcessTime': 5, 'TotalTime': 20}}
self.assertEqual({'Browser': 0.125}, cpu._SubtractCpuStats(end, start))
self.assertRaises(AssertionError, cpu._SubtractCpuStats, start, end)
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