| # 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)) |
| |