test: add uts for cni add function (#3069)

* add dualnic windows multitenancy test

* add linux multitenancy test

* add linux swiftv2 multi nic ep info test

* add windows swiftv2 infra with delegated ep info test

* add check to ensure epInfo.ifName is overwritten in add endpoint for linux swiftv2

* test options set in invoker propagate to all endpoint infos

* test dns in nwCfg propagates to all endpoint infos

* test options and data are created for each endpoint info

* address linter issues

Author: QxBytes

cni/network/invoker_mock.go

@@ -31,7 +31,7 @@ type MockIpamInvoker struct {
 	delegatedVMNIC     bool
 	delegatedVMNICFail bool
 	ipMap              map[string]bool
-	customReturn       map[string]network.InterfaceInfo
+	add                func(opt IPAMAddConfig) (ipamAddResult IPAMAddResult, err error)
 }
 
 func NewMockIpamInvoker(ipv6, v4Fail, v6Fail, delegatedVMNIC, delegatedVMNICFail bool) *MockIpamInvoker {
@@ -47,8 +47,11 @@ func NewMockIpamInvoker(ipv6, v4Fail, v6Fail, delegatedVMNIC, delegatedVMNICFail
 
 func NewCustomMockIpamInvoker(customReturn map[string]network.InterfaceInfo) *MockIpamInvoker {
 	return &MockIpamInvoker{
-		customReturn: customReturn,
-
+		add: func(_ IPAMAddConfig) (ipamAddResult IPAMAddResult, err error) {
+			ipamAddResult = IPAMAddResult{interfaceInfo: make(map[string]network.InterfaceInfo)}
+			ipamAddResult.interfaceInfo = customReturn
+			return ipamAddResult, nil
+		},
 		ipMap: make(map[string]bool),
 	}
 }
@@ -112,9 +115,8 @@ func (invoker *MockIpamInvoker) Add(opt IPAMAddConfig) (ipamAddResult IPAMAddRes
 		}
 	}
 
-	if invoker.customReturn != nil {
-		ipamAddResult.interfaceInfo = invoker.customReturn
-		return ipamAddResult, nil
+	if invoker.add != nil {
+		return invoker.add(opt)
 	}
 
 	return ipamAddResult, nil

cni/network/network_linux.go

@@ -46,6 +46,7 @@ func setNetworkOptions(cnsNwConfig *cns.GetNetworkContainerResponse, nwInfo *net
 	}
 }
 
+// update epInfo data field, allow host to nc, allow nc to host, and network container id
 func setEndpointOptions(cnsNwConfig *cns.GetNetworkContainerResponse, epInfo *network.EndpointInfo, vethName string) {
 	if cnsNwConfig != nil && cnsNwConfig.MultiTenancyInfo.ID != 0 {
 		logger.Info("Setting Endpoint Options")