yardstick/tests/unit/network_services/libs/ixia_libs/test_ixnet_api.py

   1 # Copyright (c) 2018 Intel Corporation
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #      http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 import mock
  16 import IxNetwork
  17 import unittest
  18
  19 from copy import deepcopy
  20
  21 from yardstick.common import exceptions
  22 from yardstick.network_services.libs.ixia_libs.ixnet import ixnet_api
  23
  24
  25 UPLINK = 'uplink'
  26 DOWNLINK = 'downlink'
  27
  28 TRAFFIC_PARAMETERS = {
  29     UPLINK: {
  30         'id': 1,
  31         'bidir': 'False',
  32         'duration': 60,
  33         'rate': 10000.5,
  34         'rate_unit': 'fps',
  35         'outer_l2': {
  36             'framesize': {'64B': '25', '256B': '75'},
  37             'QinQ': None
  38         },
  39         'outer_l3': {
  40             'count': 512,
  41             'srcseed': 10,
  42             'dstseed': 20,
  43             'dscp': 0,
  44             'proto': 'udp',
  45             'ttl': 32,
  46             'dstip': '152.16.40.20',
  47             'srcip': '152.16.100.20',
  48             'dstmask': 24,
  49             'srcmask': 24
  50         },
  51         'outer_l4': {
  52             'seed': 1,
  53             'count': 1,
  54             'dstport': 2001,
  55             'srcport': 1234,
  56             'srcportmask': 0,
  57             'dstportmask': 0
  58         },
  59         'traffic_type': 'continuous'
  60     },
  61     DOWNLINK: {
  62         'id': 2,
  63         'bidir': 'False',
  64         'duration': 60,
  65         'rate': 75.2,
  66         'rate_unit': '%',
  67         'outer_l2': {
  68             'framesize': {'128B': '35', '1024B': '65'},
  69             'QinQ': None
  70         },
  71         'outer_l3': {
  72             'count': 1024,
  73             'srcseed': 30,
  74             'dstseed': 40,
  75             'dscp': 0,
  76             'proto': 'udp',
  77             'ttl': 32,
  78             'dstip': '2001::10',
  79             'srcip': '2021::10',
  80             'dstmask': 64,
  81             'srcmask': 64
  82         },
  83         'outer_l4': {
  84             'seed': 1,
  85             'count': 1,
  86             'dstport': 1234,
  87             'srcport': 2001,
  88             'srcportmask': 0,
  89             'dstportmask': 0
  90         },
  91         'traffic_type': 'continuous'
  92     }
  93 }
  94
  95
  96 class TestIxNextgen(unittest.TestCase):
  97
  98     def setUp(self):
  99         self.ixnet = mock.Mock()
 100         self.ixnet.execute = mock.Mock()
 101         self.ixnet.getRoot.return_value = 'my_root'
 102         self.ixnet_gen = ixnet_api.IxNextgen()
 103         self.ixnet_gen._ixnet = self.ixnet
 104
 105     def test_get_config(self):
 106         tg_cfg = {
 107             'vdu': [
 108                 {
 109                     'external-interface': [
 110                         {'virtual-interface': {'vpci': '0000:07:00.1'}},
 111                         {'virtual-interface': {'vpci': '0001:08:01.2'}}
 112                     ]
 113                 },
 114             ],
 115             'mgmt-interface': {
 116                 'ip': 'test1',
 117                 'tg-config': {
 118                     'dut_result_dir': 'test2',
 119                     'version': 'test3',
 120                     'ixchassis': 'test4',
 121                     'tcl_port': 'test5',
 122                 },
 123             }
 124         }
 125
 126         expected = {
 127             'machine': 'test1',
 128             'port': 'test5',
 129             'chassis': 'test4',
 130             'cards': ['0000', '0001'],
 131             'ports': ['07', '08'],
 132             'output_dir': 'test2',
 133             'version': 'test3',
 134             'bidir': True,
 135         }
 136
 137         result = ixnet_api.IxNextgen.get_config(tg_cfg)
 138         self.assertEqual(result, expected)
 139
 140     def test__get_config_element_by_flow_group_name(self):
 141         self.ixnet_gen._ixnet.getList.side_effect = [['traffic_item'],
 142                                                      ['fg_01']]
 143         self.ixnet_gen._ixnet.getAttribute.return_value = 'flow_group_01'
 144         output = self.ixnet_gen._get_config_element_by_flow_group_name(
 145             'flow_group_01')
 146         self.assertEqual('traffic_item/configElement:flow_group_01', output)
 147
 148     def test__get_config_element_by_flow_group_name_no_match(self):
 149         self.ixnet_gen._ixnet.getList.side_effect = [['traffic_item'],
 150                                                      ['fg_01']]
 151         self.ixnet_gen._ixnet.getAttribute.return_value = 'flow_group_02'
 152         output = self.ixnet_gen._get_config_element_by_flow_group_name(
 153             'flow_group_01')
 154         self.assertIsNone(output)
 155
 156     def test__get_stack_item(self):
 157         self.ixnet_gen._ixnet.getList.return_value = ['tcp1', 'tcp2', 'udp']
 158         with mock.patch.object(
 159                 self.ixnet_gen, '_get_config_element_by_flow_group_name') as \
 160                 mock_get_cfg_element:
 161             mock_get_cfg_element.return_value = 'cfg_element'
 162             output = self.ixnet_gen._get_stack_item(mock.ANY, ixnet_api.PROTO_TCP)
 163         self.assertEqual(['tcp1', 'tcp2'], output)
 164
 165     def test__get_stack_item_no_config_element(self):
 166         with mock.patch.object(
 167                 self.ixnet_gen, '_get_config_element_by_flow_group_name',
 168                 return_value=None):
 169             with self.assertRaises(exceptions.IxNetworkFlowNotPresent):
 170                 self.ixnet_gen._get_stack_item(mock.ANY, mock.ANY)
 171
 172     def test__get_field_in_stack_item(self):
 173         self.ixnet_gen._ixnet.getList.return_value = ['field1', 'field2']
 174         output = self.ixnet_gen._get_field_in_stack_item(mock.ANY, 'field2')
 175         self.assertEqual('field2', output)
 176
 177     def test__get_field_in_stack_item_no_field_present(self):
 178         self.ixnet_gen._ixnet.getList.return_value = ['field1', 'field2']
 179         with self.assertRaises(exceptions.IxNetworkFieldNotPresentInStackItem):
 180             self.ixnet_gen._get_field_in_stack_item(mock.ANY, 'field3')
 181
 182     def test__parse_framesize(self):
 183         framesize = {'64B': '75', '512b': '25'}
 184         output = self.ixnet_gen._parse_framesize(framesize)
 185         self.assertEqual(2, len(output))
 186         self.assertIn([64, 64, 75], output)
 187         self.assertIn([512, 512, 25], output)
 188
 189     @mock.patch.object(IxNetwork, 'IxNet')
 190     def test_connect(self, mock_ixnet):
 191         mock_ixnet.return_value = self.ixnet
 192         with mock.patch.object(self.ixnet_gen, 'get_config') as mock_config:
 193             mock_config.return_value = {'machine': 'machine_fake',
 194                                         'port': 'port_fake',
 195                                         'version': 12345}
 196             self.ixnet_gen.connect(mock.ANY)
 197
 198         self.ixnet.connect.assert_called_once_with(
 199             'machine_fake', '-port', 'port_fake', '-version', '12345')
 200         mock_config.assert_called_once()
 201
 202     def test_connect_invalid_config_no_machine(self):
 203         self.ixnet_gen.get_config = mock.Mock(return_value={
 204             'port': 'port_fake',
 205             'version': '12345'})
 206         self.assertRaises(KeyError, self.ixnet_gen.connect, mock.ANY)
 207         self.ixnet.connect.assert_not_called()
 208
 209     def test_connect_invalid_config_no_port(self):
 210         self.ixnet_gen.get_config = mock.Mock(return_value={
 211             'machine': 'machine_fake',
 212             'version': '12345'})
 213         self.assertRaises(KeyError, self.ixnet_gen.connect, mock.ANY)
 214         self.ixnet.connect.assert_not_called()
 215
 216     def test_connect_invalid_config_no_version(self):
 217         self.ixnet_gen.get_config = mock.Mock(return_value={
 218             'machine': 'machine_fake',
 219             'port': 'port_fake'})
 220         self.assertRaises(KeyError, self.ixnet_gen.connect, mock.ANY)
 221         self.ixnet.connect.assert_not_called()
 222
 223     def test_connect_no_config(self):
 224         self.ixnet_gen.get_config = mock.Mock(return_value={})
 225         self.assertRaises(KeyError, self.ixnet_gen.connect, mock.ANY)
 226         self.ixnet.connect.assert_not_called()
 227
 228     def test_clear_config(self):
 229         self.ixnet_gen.clear_config()
 230         self.ixnet.execute.assert_called_once_with('newConfig')
 231
 232     @mock.patch.object(ixnet_api, 'log')
 233     def test_assign_ports_2_ports(self, *args):
 234         self.ixnet.getAttribute.side_effect = ['up', 'down']
 235         config = {
 236             'chassis': '1.1.1.1',
 237             'cards': ['1', '2'],
 238             'ports': ['2', '2']}
 239         self.ixnet_gen._cfg = config
 240
 241         self.assertIsNone(self.ixnet_gen.assign_ports())
 242         self.assertEqual(self.ixnet.execute.call_count, 2)
 243         self.assertEqual(self.ixnet.commit.call_count, 4)
 244         self.assertEqual(self.ixnet.getAttribute.call_count, 2)
 245
 246     @mock.patch.object(ixnet_api, 'log')
 247     def test_assign_ports_port_down(self, mock_log):
 248         self.ixnet.getAttribute.return_value = 'down'
 249         config = {
 250             'chassis': '1.1.1.1',
 251             'cards': ['1', '2'],
 252             'ports': ['3', '4']}
 253         self.ixnet_gen._cfg = config
 254         self.ixnet_gen.assign_ports()
 255         mock_log.warning.assert_called()
 256
 257     def test_assign_ports_no_config(self):
 258         self.ixnet_gen._cfg = {}
 259         self.assertRaises(KeyError, self.ixnet_gen.assign_ports)
 260
 261     def test__create_traffic_item(self):
 262         self.ixnet.add.return_value = 'my_new_traffic_item'
 263         self.ixnet.remapIds.return_value = ['my_traffic_item_id']
 264
 265         self.ixnet_gen._create_traffic_item()
 266         self.ixnet.add.assert_called_once_with(
 267             'my_root/traffic', 'trafficItem')
 268         self.ixnet.setMultiAttribute.assert_called_once_with(
 269             'my_new_traffic_item', '-name', 'RFC2544', '-trafficType', 'raw')
 270         self.assertEqual(2, self.ixnet.commit.call_count)
 271         self.ixnet.remapIds.assert_called_once_with('my_new_traffic_item')
 272         self.ixnet.setAttribute('my_traffic_item_id/tracking',
 273                                 '-trackBy', 'trafficGroupId0')
 274
 275     def test__create_flow_groups(self):
 276         self.ixnet_gen.ixnet.getList.side_effect = [['traffic_item'], ['1', '2']]
 277         self.ixnet_gen.ixnet.add.side_effect = ['endp1', 'endp2']
 278         self.ixnet_gen._create_flow_groups()
 279         self.ixnet_gen.ixnet.add.assert_has_calls([
 280             mock.call('traffic_item', 'endpointSet'),
 281             mock.call('traffic_item', 'endpointSet')])
 282         self.ixnet_gen.ixnet.setMultiAttribute.assert_has_calls([
 283             mock.call('endp1', '-name', '1', '-sources', ['1/protocols'],
 284                       '-destinations', ['2/protocols']),
 285             mock.call('endp2', '-name', '2', '-sources', ['2/protocols'],
 286                       '-destinations', ['1/protocols'])])
 287
 288     def test__append_protocol_to_stack(self):
 289
 290         self.ixnet_gen._append_procotol_to_stack('my_protocol', 'prev_element')
 291         self.ixnet.execute.assert_called_with(
 292             'append', 'prev_element',
 293             'my_root/traffic/protocolTemplate:"my_protocol"')
 294
 295     def test__setup_config_elements(self):
 296         self.ixnet_gen.ixnet.getList.side_effect = [['traffic_item'],
 297                                                ['cfg_element']]
 298         with mock.patch.object(self.ixnet_gen, '_append_procotol_to_stack') as \
 299                 mock_append_proto:
 300             self.ixnet_gen._setup_config_elements()
 301         mock_append_proto.assert_has_calls([
 302             mock.call(ixnet_api.PROTO_UDP, 'cfg_element/stack:"ethernet-1"'),
 303             mock.call(ixnet_api.PROTO_IPV4, 'cfg_element/stack:"ethernet-1"')])
 304         self.ixnet_gen.ixnet.setAttribute.assert_has_calls([
 305             mock.call('cfg_element/frameRateDistribution', '-portDistribution',
 306                       'splitRateEvenly'),
 307             mock.call('cfg_element/frameRateDistribution',
 308                       '-streamDistribution', 'splitRateEvenly')])
 309
 310     @mock.patch.object(ixnet_api.IxNextgen, '_create_traffic_item')
 311     @mock.patch.object(ixnet_api.IxNextgen, '_create_flow_groups')
 312     @mock.patch.object(ixnet_api.IxNextgen, '_setup_config_elements')
 313     def test_create_traffic_model(self, mock__setup_config_elements,
 314                                   mock__create_flow_groups,
 315                                   mock__create_traffic_item):
 316
 317         self.ixnet_gen.create_traffic_model()
 318         mock__create_traffic_item.assert_called_once()
 319         mock__create_flow_groups.assert_called_once()
 320         mock__setup_config_elements.assert_called_once()
 321
 322     def test__update_frame_mac(self):
 323         with mock.patch.object(self.ixnet_gen, '_get_field_in_stack_item') as \
 324                 mock_get_field:
 325             mock_get_field.return_value = 'field_descriptor'
 326             self.ixnet_gen._update_frame_mac('ethernet_descriptor', 'field', 'mac')
 327         mock_get_field.assert_called_once_with('ethernet_descriptor', 'field')
 328         self.ixnet_gen.ixnet.setMultiAttribute(
 329             'field_descriptor', '-singleValue', 'mac', '-fieldValue', 'mac',
 330             '-valueType', 'singleValue')
 331         self.ixnet_gen.ixnet.commit.assert_called_once()
 332
 333     def test_update_frame(self):
 334         with mock.patch.object(
 335                 self.ixnet_gen, '_get_config_element_by_flow_group_name',
 336                 return_value='cfg_element'), \
 337                 mock.patch.object(self.ixnet_gen, '_update_frame_mac') as \
 338                 mock_update_frame, \
 339                 mock.patch.object(self.ixnet_gen, '_get_stack_item') as \
 340                 mock_get_stack_item:
 341             mock_get_stack_item.side_effect = [['item1'], ['item2'],
 342                                                ['item3'], ['item4']]
 343             self.ixnet_gen.update_frame(TRAFFIC_PARAMETERS, 50)
 344
 345         self.assertEqual(6, len(self.ixnet_gen.ixnet.setMultiAttribute.mock_calls))
 346         self.assertEqual(4, len(mock_update_frame.mock_calls))
 347
 348         self.ixnet_gen.ixnet.setMultiAttribute.assert_has_calls([
 349             mock.call('cfg_element/transmissionControl',
 350                       '-type', 'continuous', '-duration', 50)
 351         ])
 352
 353     def test_update_frame_qinq(self):
 354         with mock.patch.object(self.ixnet_gen,
 355                                '_get_config_element_by_flow_group_name',
 356                                return_value='cfg_element'), \
 357              mock.patch.object(self.ixnet_gen, '_update_frame_mac'),\
 358              mock.patch.object(self.ixnet_gen, '_get_stack_item',
 359                                return_value='item'), \
 360              mock.patch.object(self.ixnet_gen, '_get_field_in_stack_item',
 361                                return_value='field'):
 362
 363             traffic_parameters = deepcopy(TRAFFIC_PARAMETERS)
 364             traffic_parameters[UPLINK]['outer_l2']['QinQ'] = {
 365                 'S-VLAN': {'id': 128,
 366                            'priority': 1,
 367                            'cfi': 0},
 368                 'C-VLAN': {'id': 512,
 369                            'priority': 0,
 370                            'cfi': 2}
 371             }
 372
 373             self.ixnet_gen.update_frame(traffic_parameters, 50)
 374
 375         self.ixnet_gen.ixnet.setMultiAttribute.assert_has_calls([
 376             mock.call('field', '-auto', 'false', '-singleValue', '0x88a8',
 377                       '-fieldValue', '0x88a8', '-valueType', 'singleValue'),
 378             mock.call('field', '-auto', 'false', '-singleValue', 1,
 379                       '-fieldValue', 1, '-valueType', 'singleValue'),
 380             mock.call('field', '-auto', 'false', '-singleValue', 128,
 381                       '-fieldValue', 128, '-valueType', 'singleValue'),
 382             mock.call('field', '-auto', 'false', '-singleValue', 512,
 383                       '-fieldValue', 512, '-valueType', 'singleValue'),
 384             mock.call('field', '-auto', 'false', '-singleValue', 2,
 385                       '-fieldValue', 2, '-valueType', 'singleValue')
 386         ], any_order=True)
 387
 388     def test_update_frame_flow_not_present(self):
 389         with mock.patch.object(
 390                 self.ixnet_gen, '_get_config_element_by_flow_group_name',
 391                 return_value=None):
 392             with self.assertRaises(exceptions.IxNetworkFlowNotPresent):
 393                 self.ixnet_gen.update_frame(TRAFFIC_PARAMETERS, 40)
 394
 395     def test_get_statistics(self):
 396         port_statistics = '::ixNet::OBJ-/statistics/view:"Port Statistics"'
 397         flow_statistics = '::ixNet::OBJ-/statistics/view:"Flow Statistics"'
 398         with mock.patch.object(self.ixnet_gen, '_build_stats_map') as \
 399                 mock_build_stats:
 400             self.ixnet_gen.get_statistics()
 401
 402         mock_build_stats.assert_has_calls([
 403             mock.call(port_statistics, self.ixnet_gen.PORT_STATS_NAME_MAP),
 404             mock.call(flow_statistics, self.ixnet_gen.LATENCY_NAME_MAP)])
 405
 406     def test__update_ipv4_address(self):
 407         with mock.patch.object(self.ixnet_gen, '_get_field_in_stack_item',
 408                                return_value='field_desc'):
 409             self.ixnet_gen._update_ipv4_address(mock.ANY, mock.ANY, '192.168.1.1',
 410                                            100, 26, 25)
 411         self.ixnet_gen.ixnet.setMultiAttribute.assert_called_once_with(
 412             'field_desc', '-seed', 100, '-fixedBits', '192.168.1.1',
 413             '-randomMask', '0.0.0.63', '-valueType', 'random',
 414             '-countValue', 25)
 415
 416     def test__update_udp_port(self):
 417         with mock.patch.object(self.ixnet_gen, '_get_field_in_stack_item',
 418                                return_value='field_desc'):
 419             self.ixnet_gen._update_udp_port(mock.ANY, mock.ANY, 1234,
 420                                             2, 0, 2)
 421
 422         self.ixnet_gen.ixnet.setMultiAttribute.assert_called_once_with(
 423             'field_desc',
 424             '-auto', 'false',
 425             '-seed', 1,
 426             '-fixedBits', 1234,
 427             '-randomMask', 0,
 428             '-valueType', 'random',
 429             '-countValue', 1)
 430
 431     def test_update_ip_packet(self):
 432         with mock.patch.object(self.ixnet_gen, '_update_ipv4_address') as \
 433                 mock_update_add, \
 434                 mock.patch.object(self.ixnet_gen, '_get_stack_item'), \
 435                 mock.patch.object(self.ixnet_gen,
 436                 '_get_config_element_by_flow_group_name', return_value='celm'):
 437             self.ixnet_gen.update_ip_packet(TRAFFIC_PARAMETERS)
 438
 439         self.assertEqual(4, len(mock_update_add.mock_calls))
 440
 441     def test_update_ip_packet_exception_no_config_element(self):
 442         with mock.patch.object(self.ixnet_gen,
 443                                '_get_config_element_by_flow_group_name',
 444                                return_value=None):
 445             with self.assertRaises(exceptions.IxNetworkFlowNotPresent):
 446                 self.ixnet_gen.update_ip_packet(TRAFFIC_PARAMETERS)
 447
 448     def test_update_l4(self):
 449         with mock.patch.object(self.ixnet_gen, '_update_udp_port') as \
 450                 mock_update_udp, \
 451                 mock.patch.object(self.ixnet_gen, '_get_stack_item'), \
 452                 mock.patch.object(self.ixnet_gen,
 453                 '_get_config_element_by_flow_group_name', return_value='celm'):
 454             self.ixnet_gen.update_l4(TRAFFIC_PARAMETERS)
 455
 456         self.assertEqual(4, len(mock_update_udp.mock_calls))
 457
 458     def test_update_l4_exception_no_config_element(self):
 459         with mock.patch.object(self.ixnet_gen,
 460                                '_get_config_element_by_flow_group_name',
 461                                return_value=None):
 462             with self.assertRaises(exceptions.IxNetworkFlowNotPresent):
 463                 self.ixnet_gen.update_l4(TRAFFIC_PARAMETERS)
 464
 465     def test_update_l4_exception_no_supported_proto(self):
 466         traffic_parameters = {
 467             UPLINK: {
 468                 'id': 1,
 469                 'outer_l3': {
 470                     'proto': 'unsupported',
 471                 },
 472             },
 473         }
 474         with mock.patch.object(self.ixnet_gen,
 475                                '_get_config_element_by_flow_group_name',
 476                                return_value='celm'):
 477             with self.assertRaises(exceptions.IXIAUnsupportedProtocol):
 478                 self.ixnet_gen.update_l4(traffic_parameters)
 479
 480     @mock.patch.object(ixnet_api.IxNextgen, '_get_traffic_state')
 481     def test_start_traffic(self, mock_ixnextgen_get_traffic_state):
 482         self.ixnet_gen._ixnet.getList.return_value = [0]
 483
 484         mock_ixnextgen_get_traffic_state.side_effect = [
 485             'stopped', 'started', 'started', 'started']
 486
 487         result = self.ixnet_gen.start_traffic()
 488         self.assertIsNone(result)
 489         self.ixnet.getList.assert_called_once()
 490         self.assertEqual(3, self.ixnet_gen._ixnet.execute.call_count)
 491
 492     @mock.patch.object(ixnet_api.IxNextgen, '_get_traffic_state')
 493     def test_start_traffic_traffic_running(
 494             self, mock_ixnextgen_get_traffic_state):
 495         self.ixnet_gen._ixnet.getList.return_value = [0]
 496         mock_ixnextgen_get_traffic_state.side_effect = [
 497             'started', 'stopped', 'started']
 498
 499         result = self.ixnet_gen.start_traffic()
 500         self.assertIsNone(result)
 501         self.ixnet.getList.assert_called_once()
 502         self.assertEqual(4, self.ixnet_gen._ixnet.execute.call_count)
 503
 504     @mock.patch.object(ixnet_api.IxNextgen, '_get_traffic_state')
 505     def test_start_traffic_wait_for_traffic_to_stop(
 506             self, mock_ixnextgen_get_traffic_state):
 507         self.ixnet_gen._ixnet.getList.return_value = [0]
 508         mock_ixnextgen_get_traffic_state.side_effect = [
 509             'started', 'started', 'started', 'stopped', 'started']
 510
 511         result = self.ixnet_gen.start_traffic()
 512         self.assertIsNone(result)
 513         self.ixnet.getList.assert_called_once()
 514         self.assertEqual(4, self.ixnet_gen._ixnet.execute.call_count)
 515
 516     @mock.patch.object(ixnet_api.IxNextgen, '_get_traffic_state')
 517     def test_start_traffic_wait_for_traffic_start(
 518             self, mock_ixnextgen_get_traffic_state):
 519         self.ixnet_gen._ixnet.getList.return_value = [0]
 520         mock_ixnextgen_get_traffic_state.side_effect = [
 521             'stopped', 'stopped', 'stopped', 'started']
 522
 523         result = self.ixnet_gen.start_traffic()
 524         self.assertIsNone(result)
 525         self.ixnet.getList.assert_called_once()
 526         self.assertEqual(3, self.ixnet_gen._ixnet.execute.call_count)