'Query for initial sample for RAW Performance classes.'

def test_raw_initial_sampling(self):

    wmi_sampler = WMISampler('Win32_PerfRawData_PerfOS_System', ['CounterRawCount', 'CounterCounter'])
    wmi_sampler.sample()
    self.assertEquals(SWbemServices.ExecQuery.call_count, 2, SWbemServices.ExecQuery.call_count)
    wmi_sampler.sample()
    self.assertEquals(SWbemServices.ExecQuery.call_count, 3, SWbemServices.ExecQuery.call_count)
