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How to use _check_if_allocation_is_possible method in tempest

Best Python code snippet using tempest_python

test_minbw_allocation_placement.py

Source:test_minbw_allocation_placement.py

...100                'provider:physical_network': physnet_name,101                'provider:segmentation_id': base_segm102            })103        self._create_qos_policies()104    def _check_if_allocation_is_possible(self):105        alloc_candidates = self.placement_client.list_allocation_candidates(106            resources1='%s:%s' % (self.INGRESS_RESOURCE_CLASS,107                                  self.SMALLEST_POSSIBLE_BW))108        if len(alloc_candidates['provider_summaries']) == 0:109            self.fail('No allocation candidates are available for %s:%s' %110                      (self.INGRESS_RESOURCE_CLASS, self.SMALLEST_POSSIBLE_BW))111        # Just to be sure check with impossible high (placement max_int),112        # allocation113        alloc_candidates = self.placement_client.list_allocation_candidates(114            resources1='%s:%s' % (self.INGRESS_RESOURCE_CLASS,115                                  self.PLACEMENT_MAX_INT))116        if len(alloc_candidates['provider_summaries']) != 0:117            self.fail('For %s:%s there should be no available candidate!' %118                      (self.INGRESS_RESOURCE_CLASS, self.PLACEMENT_MAX_INT))119    @decorators.idempotent_id('78625d92-212c-400e-8695-dd51706858b8')120    @decorators.attr(type='slow')121    @utils.services('compute', 'network')122    def test_qos_min_bw_allocation_basic(self):123        """"Basic scenario with QoS min bw allocation in placement.124        Steps:125        * Create prerequisites:126        ** VLAN type provider network with subnet.127        ** valid QoS policy with minimum bandwidth rule with min_kbps=1128        (This is a simplification to skip the checks in placement for129        detecting the resource provider tree and inventories, as if130        bandwidth resource is available 1 kbs will be available).131        ** invalid QoS policy with minimum bandwidth rule with132        min_kbs=max integer from placement (this is a simplification again133        to avoid detection of RP tress and inventories, as placement will134        reject such big allocation).135        * Create port with valid QoS policy, and boot VM with that, it should136        pass.137        * Create port with invalid QoS policy, and try to boot VM with that,138        it should fail.139        """140        self._check_if_allocation_is_possible()141        self._create_network_and_qos_policies()142        valid_port = self.create_port(143            self.prov_network['id'], qos_policy_id=self.qos_policy_valid['id'])144        server1 = self.create_server(145            networks=[{'port': valid_port['id']}])146        allocations = self.placement_client.list_allocations(server1['id'])147        self.assertGreater(len(allocations['allocations']), 0)148        bw_resource_in_alloc = False149        for rp, resources in allocations['allocations'].items():150            if self.INGRESS_RESOURCE_CLASS in resources['resources']:151                bw_resource_in_alloc = True152        self.assertTrue(bw_resource_in_alloc)153        # boot another vm with max int bandwidth154        not_valid_port = self.create_port(...

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