ambari-metrics-host-monitoring/src/test/python/core/TestHostInfo.py - ambari-metrics - Git at Google

 #!/usr/bin/env python

 '''
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership.  The ASF licenses this file
 to you under the Apache License, Version 2.0 (the
 "License"); you may not use this file except in compliance
 with the License.  You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 '''

 import collections
 import logging
 import platform
 from host_info import HostInfo
 from mock.mock import patch, MagicMock
 from unittest import TestCase

 logger = logging.getLogger()

 class TestHostInfo(TestCase):

   @patch("psutil.cpu_count")
   @patch("psutil.cpu_times_percent")
   def testCpuTimes(self, cp_mock, count_mock):
     count_mock.return_value = 1

     cp = cp_mock.return_value
     cp.user = 0.1
     cp.system = 0.1
     cp.idle = 0.7
     cp.nice = 0.1
     cp.iowait = 0
     cp.irq = 0
     cp.softirq = 0
     hostinfo = HostInfo(MagicMock())

     if platform.system() != "Windows":
       with patch("os.getloadavg") as avg_mock:
         avg_mock.return_value  = [13, 13, 13]
         cpu = hostinfo.get_cpu_times()
         self.assertEqual(cpu['load_one'], 13)
         self.assertEqual(cpu['load_five'], 13)
         self.assertEqual(cpu['load_fifteen'], 13)
     else:
       cpu = hostinfo.get_cpu_times()

     self.assertAlmostEqual(cpu['cpu_user'], 0.1)
     self.assertAlmostEqual(cpu['cpu_system'], 0.1)
     self.assertAlmostEqual(cpu['cpu_idle'], 0.7)
     self.assertAlmostEqual(cpu['cpu_nice'], 0.1)
     self.assertAlmostEqual(cpu['cpu_wio'], 0)
     self.assertAlmostEqual(cpu['cpu_intr'], 0)
     self.assertAlmostEqual(cpu['cpu_sintr'], 0)


   @patch("psutil.swap_memory")
   @patch("psutil.virtual_memory")
   def testMemInfo(self, vm_mock, sw_mock):

     vm = vm_mock.return_value
     vm.free = 2312043
     vm.shared = 1243
     vm.buffers = 23435
     vm.cached = 23545
     vm.available = 2312043

     sw = sw_mock.return_value
     sw.free = 2341234

     hostinfo = HostInfo(MagicMock())

     mem = hostinfo.get_mem_info()

     self.assertAlmostEqual(mem['mem_free'], 2257)
     self.assertAlmostEqual(mem['mem_shared'], 1)
     self.assertAlmostEqual(mem['mem_buffered'], 22)
     self.assertAlmostEqual(mem['mem_cached'], 22)
     self.assertAlmostEqual(mem['swap_free'], 2286)


   @patch("psutil.process_iter")
   def testProcessInfo(self, process_iter_mock):

     def side_effect_running():
       return 'running'

     class Proc:
       def status(self):
         return 'some_status'

     p1 = Proc()
     p1.status = side_effect_running
     p2 = Proc()
     p2.status = side_effect_running
     p3 = Proc()
     p4 = Proc()

     processes = [p1, p2, p3, p4]

     process_iter_mock.return_value = processes

     hostinfo = HostInfo(MagicMock())

     procs = hostinfo.get_process_info()

     self.assertEqual(procs['proc_run'], 2)
     self.assertEqual(procs['proc_total'], len(processes))

   @patch("psutil.disk_usage")
   @patch("psutil.disk_partitions")
   def testCombinedDiskUsage(self, dp_mock, du_mock):

     dp_mock.__iter__.return_value = ['a', 'b', 'c']

     hostinfo = HostInfo(MagicMock())

     cdu = hostinfo.get_combined_disk_usage()
     self.assertEqual(cdu['disk_total'], "0.00")
     self.assertEqual(cdu['disk_used'], "0.00")
     self.assertEqual(cdu['disk_free'], "0.00")
     self.assertEqual(cdu['disk_percent'], 0)

   @patch("psutil.disk_io_counters")
   def testDiskIOCounters(self, io_mock):

     Counters = collections.namedtuple('sdiskio', ['read_count', 'write_count',
                                                   'read_bytes', 'write_bytes',
                                                   'read_time', 'write_time'])
     io_mock.return_value = Counters(0, 1, 2, 3, 4, 5)

     c = MagicMock()
     c.get_disk_metrics_skip_pattern.return_value = None
     hostinfo = HostInfo(c)

     disk_counters = hostinfo.get_combined_disk_io_counters()

     self.assertEqual(disk_counters['read_count'], 0)
     self.assertEqual(disk_counters['write_count'], 1)
     self.assertEqual(disk_counters['read_bytes'], 2)
     self.assertEqual(disk_counters['write_bytes'], 3)
     self.assertEqual(disk_counters['read_time'], 4)
     self.assertEqual(disk_counters['write_time'], 5)

   @patch("psutil.disk_io_counters")
   def test_get_disk_io_counters_per_disk(self, io_counters_mock):
     Counters = collections.namedtuple('sdiskio', ['read_count', 'write_count',
                                                   'read_bytes', 'write_bytes',
                                                   'read_time', 'write_time',
                                                   'busy_time', 'read_merged_count',
                                                   'write_merged_count'
                                                   ])

     disk_counters1 = Counters(read_count = 0, write_count = 1,
                             read_bytes = 2, write_bytes = 3,
                             read_time = 4, write_time = 5,
                             busy_time = 6, read_merged_count = 7,
                             write_merged_count = 8
     )

     disk_counters2 = Counters(read_count = 9, write_count = 10,
                             read_bytes = 11, write_bytes = 12,
                             read_time = 13, write_time = 14,
                             busy_time = 15, read_merged_count = 16,
                             write_merged_count = 17
     )

     counters_per_disk = { 'sdb1' : disk_counters2, 'sda1' : disk_counters1 }
     io_counters_mock.return_value = counters_per_disk

     hostinfo = HostInfo(MagicMock())

     disk_counter_per_disk = hostinfo.get_disk_io_counters_per_disk()

     # Assert for sdisk_sda1
     self.assertEqual(disk_counter_per_disk['sdisk_sda1_read_count'], 0)
     self.assertEqual(disk_counter_per_disk['sdisk_sda1_write_count'], 1)
     self.assertEqual(disk_counter_per_disk['sdisk_sda1_read_bytes'], 2)
     self.assertEqual(disk_counter_per_disk['sdisk_sda1_write_bytes'], 3)
     self.assertEqual(disk_counter_per_disk['sdisk_sda1_read_time'], 4)
     self.assertEqual(disk_counter_per_disk['sdisk_sda1_write_time'], 5)
     self.assertEqual(disk_counter_per_disk['sdisk_sda1_busy_time'], 6)
     self.assertEqual(disk_counter_per_disk['sdisk_sda1_read_merged_count'], 7)
     self.assertEqual(disk_counter_per_disk['sdisk_sda1_write_merged_count'], 8)

     # Assert for sdb1

     self.assertEqual(disk_counter_per_disk['sdisk_sdb1_read_count'], 9)
     self.assertEqual(disk_counter_per_disk['sdisk_sdb1_write_count'], 10)
     self.assertEqual(disk_counter_per_disk['sdisk_sdb1_read_bytes'], 11)
     self.assertEqual(disk_counter_per_disk['sdisk_sdb1_write_bytes'], 12)
     self.assertEqual(disk_counter_per_disk['sdisk_sdb1_read_time'], 13)
     self.assertEqual(disk_counter_per_disk['sdisk_sdb1_write_time'], 14)
     self.assertEqual(disk_counter_per_disk['sdisk_sdb1_busy_time'], 15)
     self.assertEqual(disk_counter_per_disk['sdisk_sdb1_read_merged_count'], 16)
     self.assertEqual(disk_counter_per_disk['sdisk_sdb1_write_merged_count'], 17)

   @patch.object(HostInfo, "get_virtual_network_interfaces", new = MagicMock(return_value = ['etc11', 'etc2']))
   @patch("psutil.net_io_counters")
   def test_get_network_info_virtual_devices(self, net_io_counters):
     Stats = collections.namedtuple('interface', ['bytes_sent', 'bytes_recv',
                                                   'packets_sent', 'packets_recv'
                                                   ])

     net_stats = Stats(bytes_sent = 0, bytes_recv = 1,
                           packets_sent = 2, packets_recv = 3
     )

     all_net_stats = { 'etc11' : net_stats, 'etc2' : net_stats }
     net_io_counters.return_value = all_net_stats

     c = MagicMock()

     #skip virtual devices
     c.get_virtual_interfaces_skip.return_value = 'True'
     hostinfo = HostInfo(c)
     network_info = hostinfo.get_network_info()

     self.assertEqual(network_info, {})

     #do not skip virtual devices
     c.get_virtual_interfaces_skip.return_value = 'False'
     hostinfo = HostInfo(c)
     network_info = hostinfo.get_network_info()

     #len({'bytes_in': ..., 'pkts_in': ..., 'pkts_out': ..., 'bytes_out': ...}) == 4
     self.assertEqual(len(network_info), 4)

   @patch("psutil.net_io_counters")
   def test_get_network_info_skip_by_pattern(self, net_io_counters):
     Stats = collections.namedtuple('interface', ['bytes_sent', 'bytes_recv',
                                                   'packets_sent', 'packets_recv'
                                                   ])

     net_stats = Stats(bytes_sent = 0, bytes_recv = 1,
                           packets_sent = 2, packets_recv = 3
     )

     all_net_stats = { 'etc11' : net_stats, 'etc2' : net_stats }
     net_io_counters.return_value = all_net_stats

     c = MagicMock()

     #skip all by pattern
     c.get_virtual_interfaces_skip.return_value = 'False'
     c.get_network_interfaces_skip_pattern.return_value = "^etc\d*$"
     hostinfo = HostInfo(c)
     network_info = hostinfo.get_network_info()

     self.assertEqual(network_info, {})

     #skip one by pattern
     c.get_network_interfaces_skip_pattern.return_value = "^etc\d{1}$"
     hostinfo = HostInfo(c)
     network_info = hostinfo.get_network_info()

     self.assertEqual(len(network_info), 4)

     all_net_stats = { 'etc2' : net_stats }
     net_io_counters.return_value = all_net_stats
     c.get_network_interfaces_skip_pattern.return_value = "^etc\d{1}$"
     hostinfo = HostInfo(c)
     network_info = hostinfo.get_network_info()

     self.assertEqual(network_info, {})

     #skip by 'None' pattern
     c.get_network_interfaces_skip_pattern.return_value = "None"
     hostinfo = HostInfo(c)
     network_info = hostinfo.get_network_info()

     self.assertEqual(len(network_info), 4)

   @patch.object(HostInfo, "get_virtual_network_interfaces", new = MagicMock(return_value = ['etc11', 'etc2']))
   @patch("psutil.net_io_counters")
   def test_get_network_info_skip_by_pattern_and_virtual(self, net_io_counters):
     Stats = collections.namedtuple('interface', ['bytes_sent', 'bytes_recv',
                                                   'packets_sent', 'packets_recv'
                                                   ])

     net_stats = Stats(bytes_sent = 0, bytes_recv = 1,
                           packets_sent = 2, packets_recv = 3
     )

     all_net_stats = { 'etc11' : net_stats, 'etc2' : net_stats, 'etc333' : net_stats }
     net_io_counters.return_value = all_net_stats

     c = MagicMock()

     #skip only one by pattern and other as virtual
     c.get_virtual_interfaces_skip.return_value = 'True'
     c.get_network_interfaces_skip_pattern.return_value = "^etc\d{3}$"
     hostinfo = HostInfo(c)
     network_info = hostinfo.get_network_info()

     self.assertEqual(network_info, {})

   @patch("os.path.isdir")
   @patch("os.listdir")
   @patch("os.readlink")
   @patch("os.path.islink")
   def test_get_virtual_network_interfaces(self, islink, readlink, listdir, isdir):
     hostinfo = HostInfo(MagicMock())

     #virtual net device is present
     isdir.return_value = True
     listdir.return_value = ['virtual_net_dev']
     readlink.return_value = "../..devices/virtual/int6"
     islink.return_value = True

     virtual_net_devices = hostinfo.get_virtual_network_interfaces()
     self.assertEqual(virtual_net_devices, ['virtual_net_dev'])

     #virtual net device is not present
     isdir.return_value = True
     listdir.return_value = ['virtual_net_dev']
     readlink.return_value = "../..devices/pp01.000/virtio1/int6"
     islink.return_value = True

     virtual_net_devices = hostinfo.get_virtual_network_interfaces()
     self.assertEqual(virtual_net_devices, [])

     #symlinks not present
     isdir.return_value = True
     listdir.return_value = ['virtual_net_dev']
     readlink.return_value = "../..devices/virtual/int6"
     islink.return_value = False

     virtual_net_devices = hostinfo.get_virtual_network_interfaces()
     self.assertEqual(virtual_net_devices, [])

     #sysfs not available
     isdir.return_value = False
     virtual_net_devices = hostinfo.get_virtual_network_interfaces()

     self.assertEqual(virtual_net_devices, [])
	#!/usr/bin/env python

	'''
	Licensed to the Apache Software Foundation (ASF) under one
	or more contributor license agreements. See the NOTICE file
	distributed with this work for additional information
	regarding copyright ownership. The ASF licenses this file
	to you under the Apache License, Version 2.0 (the
	"License"); you may not use this file except in compliance
	with the License. You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License.
	'''

	import collections
	import logging
	import platform
	from host_info import HostInfo
	from mock.mock import patch, MagicMock
	from unittest import TestCase

	logger = logging.getLogger()

	class TestHostInfo(TestCase):

	@patch("psutil.cpu_count")
	@patch("psutil.cpu_times_percent")
	def testCpuTimes(self, cp_mock, count_mock):
	count_mock.return_value = 1

	cp = cp_mock.return_value
	cp.user = 0.1
	cp.system = 0.1
	cp.idle = 0.7
	cp.nice = 0.1
	cp.iowait = 0
	cp.irq = 0
	cp.softirq = 0
	hostinfo = HostInfo(MagicMock())

	if platform.system() != "Windows":
	with patch("os.getloadavg") as avg_mock:
	avg_mock.return_value = [13, 13, 13]
	cpu = hostinfo.get_cpu_times()
	self.assertEqual(cpu['load_one'], 13)
	self.assertEqual(cpu['load_five'], 13)
	self.assertEqual(cpu['load_fifteen'], 13)
	else:
	cpu = hostinfo.get_cpu_times()

	self.assertAlmostEqual(cpu['cpu_user'], 0.1)
	self.assertAlmostEqual(cpu['cpu_system'], 0.1)
	self.assertAlmostEqual(cpu['cpu_idle'], 0.7)
	self.assertAlmostEqual(cpu['cpu_nice'], 0.1)
	self.assertAlmostEqual(cpu['cpu_wio'], 0)
	self.assertAlmostEqual(cpu['cpu_intr'], 0)
	self.assertAlmostEqual(cpu['cpu_sintr'], 0)


	@patch("psutil.swap_memory")
	@patch("psutil.virtual_memory")
	def testMemInfo(self, vm_mock, sw_mock):

	vm = vm_mock.return_value
	vm.free = 2312043
	vm.shared = 1243
	vm.buffers = 23435
	vm.cached = 23545
	vm.available = 2312043

	sw = sw_mock.return_value
	sw.free = 2341234

	hostinfo = HostInfo(MagicMock())

	mem = hostinfo.get_mem_info()

	self.assertAlmostEqual(mem['mem_free'], 2257)
	self.assertAlmostEqual(mem['mem_shared'], 1)
	self.assertAlmostEqual(mem['mem_buffered'], 22)
	self.assertAlmostEqual(mem['mem_cached'], 22)
	self.assertAlmostEqual(mem['swap_free'], 2286)


	@patch("psutil.process_iter")
	def testProcessInfo(self, process_iter_mock):

	def side_effect_running():
	return 'running'

	class Proc:
	def status(self):
	return 'some_status'

	p1 = Proc()
	p1.status = side_effect_running
	p2 = Proc()
	p2.status = side_effect_running
	p3 = Proc()
	p4 = Proc()

	processes = [p1, p2, p3, p4]

	process_iter_mock.return_value = processes

	hostinfo = HostInfo(MagicMock())

	procs = hostinfo.get_process_info()

	self.assertEqual(procs['proc_run'], 2)
	self.assertEqual(procs['proc_total'], len(processes))

	@patch("psutil.disk_usage")
	@patch("psutil.disk_partitions")
	def testCombinedDiskUsage(self, dp_mock, du_mock):

	dp_mock.__iter__.return_value = ['a', 'b', 'c']

	hostinfo = HostInfo(MagicMock())

	cdu = hostinfo.get_combined_disk_usage()
	self.assertEqual(cdu['disk_total'], "0.00")
	self.assertEqual(cdu['disk_used'], "0.00")
	self.assertEqual(cdu['disk_free'], "0.00")
	self.assertEqual(cdu['disk_percent'], 0)

	@patch("psutil.disk_io_counters")
	def testDiskIOCounters(self, io_mock):

	Counters = collections.namedtuple('sdiskio', ['read_count', 'write_count',
	'read_bytes', 'write_bytes',
	'read_time', 'write_time'])
	io_mock.return_value = Counters(0, 1, 2, 3, 4, 5)

	c = MagicMock()
	c.get_disk_metrics_skip_pattern.return_value = None
	hostinfo = HostInfo(c)

	disk_counters = hostinfo.get_combined_disk_io_counters()

	self.assertEqual(disk_counters['read_count'], 0)
	self.assertEqual(disk_counters['write_count'], 1)
	self.assertEqual(disk_counters['read_bytes'], 2)
	self.assertEqual(disk_counters['write_bytes'], 3)
	self.assertEqual(disk_counters['read_time'], 4)
	self.assertEqual(disk_counters['write_time'], 5)

	@patch("psutil.disk_io_counters")
	def test_get_disk_io_counters_per_disk(self, io_counters_mock):
	Counters = collections.namedtuple('sdiskio', ['read_count', 'write_count',
	'read_bytes', 'write_bytes',
	'read_time', 'write_time',
	'busy_time', 'read_merged_count',
	'write_merged_count'
	])

	disk_counters1 = Counters(read_count = 0, write_count = 1,
	read_bytes = 2, write_bytes = 3,
	read_time = 4, write_time = 5,
	busy_time = 6, read_merged_count = 7,
	write_merged_count = 8
	)

	disk_counters2 = Counters(read_count = 9, write_count = 10,
	read_bytes = 11, write_bytes = 12,
	read_time = 13, write_time = 14,
	busy_time = 15, read_merged_count = 16,
	write_merged_count = 17
	)

	counters_per_disk = { 'sdb1' : disk_counters2, 'sda1' : disk_counters1 }
	io_counters_mock.return_value = counters_per_disk

	hostinfo = HostInfo(MagicMock())

	disk_counter_per_disk = hostinfo.get_disk_io_counters_per_disk()

	# Assert for sdisk_sda1
	self.assertEqual(disk_counter_per_disk['sdisk_sda1_read_count'], 0)
	self.assertEqual(disk_counter_per_disk['sdisk_sda1_write_count'], 1)
	self.assertEqual(disk_counter_per_disk['sdisk_sda1_read_bytes'], 2)
	self.assertEqual(disk_counter_per_disk['sdisk_sda1_write_bytes'], 3)
	self.assertEqual(disk_counter_per_disk['sdisk_sda1_read_time'], 4)
	self.assertEqual(disk_counter_per_disk['sdisk_sda1_write_time'], 5)
	self.assertEqual(disk_counter_per_disk['sdisk_sda1_busy_time'], 6)
	self.assertEqual(disk_counter_per_disk['sdisk_sda1_read_merged_count'], 7)
	self.assertEqual(disk_counter_per_disk['sdisk_sda1_write_merged_count'], 8)

	# Assert for sdb1

	self.assertEqual(disk_counter_per_disk['sdisk_sdb1_read_count'], 9)
	self.assertEqual(disk_counter_per_disk['sdisk_sdb1_write_count'], 10)
	self.assertEqual(disk_counter_per_disk['sdisk_sdb1_read_bytes'], 11)
	self.assertEqual(disk_counter_per_disk['sdisk_sdb1_write_bytes'], 12)
	self.assertEqual(disk_counter_per_disk['sdisk_sdb1_read_time'], 13)
	self.assertEqual(disk_counter_per_disk['sdisk_sdb1_write_time'], 14)
	self.assertEqual(disk_counter_per_disk['sdisk_sdb1_busy_time'], 15)
	self.assertEqual(disk_counter_per_disk['sdisk_sdb1_read_merged_count'], 16)
	self.assertEqual(disk_counter_per_disk['sdisk_sdb1_write_merged_count'], 17)

	@patch.object(HostInfo, "get_virtual_network_interfaces", new = MagicMock(return_value = ['etc11', 'etc2']))
	@patch("psutil.net_io_counters")
	def test_get_network_info_virtual_devices(self, net_io_counters):
	Stats = collections.namedtuple('interface', ['bytes_sent', 'bytes_recv',
	'packets_sent', 'packets_recv'
	])

	net_stats = Stats(bytes_sent = 0, bytes_recv = 1,
	packets_sent = 2, packets_recv = 3
	)

	all_net_stats = { 'etc11' : net_stats, 'etc2' : net_stats }
	net_io_counters.return_value = all_net_stats

	c = MagicMock()

	#skip virtual devices
	c.get_virtual_interfaces_skip.return_value = 'True'
	hostinfo = HostInfo(c)
	network_info = hostinfo.get_network_info()

	self.assertEqual(network_info, {})

	#do not skip virtual devices
	c.get_virtual_interfaces_skip.return_value = 'False'
	hostinfo = HostInfo(c)
	network_info = hostinfo.get_network_info()

	#len({'bytes_in': ..., 'pkts_in': ..., 'pkts_out': ..., 'bytes_out': ...}) == 4
	self.assertEqual(len(network_info), 4)

	@patch("psutil.net_io_counters")
	def test_get_network_info_skip_by_pattern(self, net_io_counters):
	Stats = collections.namedtuple('interface', ['bytes_sent', 'bytes_recv',
	'packets_sent', 'packets_recv'
	])

	net_stats = Stats(bytes_sent = 0, bytes_recv = 1,
	packets_sent = 2, packets_recv = 3
	)

	all_net_stats = { 'etc11' : net_stats, 'etc2' : net_stats }
	net_io_counters.return_value = all_net_stats

	c = MagicMock()

	#skip all by pattern
	c.get_virtual_interfaces_skip.return_value = 'False'
	c.get_network_interfaces_skip_pattern.return_value = "^etc\d*$"
	hostinfo = HostInfo(c)
	network_info = hostinfo.get_network_info()

	self.assertEqual(network_info, {})

	#skip one by pattern
	c.get_network_interfaces_skip_pattern.return_value = "^etc\d{1}$"
	hostinfo = HostInfo(c)
	network_info = hostinfo.get_network_info()

	self.assertEqual(len(network_info), 4)

	all_net_stats = { 'etc2' : net_stats }
	net_io_counters.return_value = all_net_stats
	c.get_network_interfaces_skip_pattern.return_value = "^etc\d{1}$"
	hostinfo = HostInfo(c)
	network_info = hostinfo.get_network_info()

	self.assertEqual(network_info, {})

	#skip by 'None' pattern
	c.get_network_interfaces_skip_pattern.return_value = "None"
	hostinfo = HostInfo(c)
	network_info = hostinfo.get_network_info()

	self.assertEqual(len(network_info), 4)

	@patch.object(HostInfo, "get_virtual_network_interfaces", new = MagicMock(return_value = ['etc11', 'etc2']))
	@patch("psutil.net_io_counters")
	def test_get_network_info_skip_by_pattern_and_virtual(self, net_io_counters):
	Stats = collections.namedtuple('interface', ['bytes_sent', 'bytes_recv',
	'packets_sent', 'packets_recv'
	])

	net_stats = Stats(bytes_sent = 0, bytes_recv = 1,
	packets_sent = 2, packets_recv = 3
	)

	all_net_stats = { 'etc11' : net_stats, 'etc2' : net_stats, 'etc333' : net_stats }
	net_io_counters.return_value = all_net_stats

	c = MagicMock()

	#skip only one by pattern and other as virtual
	c.get_virtual_interfaces_skip.return_value = 'True'
	c.get_network_interfaces_skip_pattern.return_value = "^etc\d{3}$"
	hostinfo = HostInfo(c)
	network_info = hostinfo.get_network_info()

	self.assertEqual(network_info, {})

	@patch("os.path.isdir")
	@patch("os.listdir")
	@patch("os.readlink")
	@patch("os.path.islink")
	def test_get_virtual_network_interfaces(self, islink, readlink, listdir, isdir):
	hostinfo = HostInfo(MagicMock())

	#virtual net device is present
	isdir.return_value = True
	listdir.return_value = ['virtual_net_dev']
	readlink.return_value = "../..devices/virtual/int6"
	islink.return_value = True

	virtual_net_devices = hostinfo.get_virtual_network_interfaces()
	self.assertEqual(virtual_net_devices, ['virtual_net_dev'])

	#virtual net device is not present
	isdir.return_value = True
	listdir.return_value = ['virtual_net_dev']
	readlink.return_value = "../..devices/pp01.000/virtio1/int6"
	islink.return_value = True

	virtual_net_devices = hostinfo.get_virtual_network_interfaces()
	self.assertEqual(virtual_net_devices, [])

	#symlinks not present
	isdir.return_value = True
	listdir.return_value = ['virtual_net_dev']
	readlink.return_value = "../..devices/virtual/int6"
	islink.return_value = False

	virtual_net_devices = hostinfo.get_virtual_network_interfaces()
	self.assertEqual(virtual_net_devices, [])

	#sysfs not available
	isdir.return_value = False
	virtual_net_devices = hostinfo.get_virtual_network_interfaces()

	self.assertEqual(virtual_net_devices, [])