VOL-1939 - Unit test cases for server.go

Change-Id: I2acc43919011ef039ed6dd8fd7ae39dcb94e615b
diff --git a/internal/pkg/afrouter/server_test.go b/internal/pkg/afrouter/server_test.go
new file mode 100644
index 0000000..f67f8cb
--- /dev/null
+++ b/internal/pkg/afrouter/server_test.go
@@ -0,0 +1,156 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+
+ * Licensed 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.
+ */
+
+package afrouter
+
+import (
+	"fmt"
+	"github.com/opencord/voltha-go/common/log"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func init() {
+	log.SetDefaultLogger(log.JSON, log.DebugLevel, nil)
+	log.AddPackage(log.JSON, log.WarnLevel, nil)
+}
+
+func MakeServerTestConfig(numBackends int, numConnections int) *ServerConfig {
+
+	var routerPackage []RouterPackage
+	var backends []BackendConfig
+	for backendIndex := 0; backendIndex < numBackends; backendIndex++ {
+		var connections []ConnectionConfig
+		for connectionIndex := 0; connectionIndex < numConnections; connectionIndex++ {
+			connectionConfig := ConnectionConfig{
+				Name: fmt.Sprintf("ro_vcore%d%d", backendIndex, connectionIndex+1),
+				Addr: "foo",
+				Port: "123",
+			}
+			connections = append(connections, connectionConfig)
+		}
+
+		backendConfig := BackendConfig{
+			Name:        fmt.Sprintf("ro_vcore%d", backendIndex),
+			Type:        BackendSingleServer,
+			Connections: connections,
+		}
+
+		backends = append(backends, backendConfig)
+	}
+
+	routerPackageConfig := RouterPackage{
+		Router:  `json:"router"`,
+		Package: `json:"package"`,
+	}
+	routerPackage = append(routerPackage, routerPackageConfig)
+
+	serverConfig := ServerConfig{
+		Name:    "grpc_command",
+		Port:    55555,
+		Addr:    "127.0.0.1",
+		Type:    "grpc",
+		Routers: routerPackage,
+		routers: make(map[string]*RouterConfig),
+	}
+	return &serverConfig
+
+}
+
+// Test creation of a new Server
+func TestServerInit(t *testing.T) {
+
+	serverConfig := MakeServerTestConfig(1, 1)
+
+	serv, err := newServer(serverConfig)
+
+	assert.NotNil(t, serv)
+	assert.Nil(t, err)
+
+}
+
+// Test creation of a new Server, error in Addr
+func TestServerInitWrongAddr(t *testing.T) {
+
+	serverConfig := MakeServerTestConfig(1, 1)
+	serverConfig.Addr = "127.300.1.1"
+
+	serv, err := newServer(serverConfig)
+
+	assert.Nil(t, serv)
+	assert.NotNil(t, err)
+}
+
+// Test creation of a new Server, error in Port
+func TestServerInitWrongPort(t *testing.T) {
+
+	serverConfig := MakeServerTestConfig(1, 1)
+	serverConfig.Port = 23
+
+	serv, err := newServer(serverConfig)
+
+	assert.Nil(t, serv)
+	assert.NotNil(t, err)
+}
+
+// Test creation of a new Server, error in Name
+func TestServerInitNoName(t *testing.T) {
+
+	serverConfig := MakeServerTestConfig(1, 1)
+	serverConfig.Name = ""
+
+	serv, err := newServer(serverConfig)
+
+	assert.Nil(t, serv)
+	assert.NotNil(t, err)
+}
+
+// Test creation of a new Server, error in Type
+func TestServerInitWrongType(t *testing.T) {
+
+	serverConfig := MakeServerTestConfig(1, 1)
+	serverConfig.Type = "xxx"
+
+	serv, err := newServer(serverConfig)
+
+	assert.Nil(t, serv)
+	assert.NotNil(t, err)
+}
+
+// Test creation of a new Server, error in Router
+func TestServerInitNoRouter(t *testing.T) {
+
+	serverConfig := MakeServerTestConfig(1, 1)
+	serverConfig.routers = nil
+
+	serv, err := newServer(serverConfig)
+
+	assert.Nil(t, serv)
+	assert.NotNil(t, err)
+}
+
+// Test creation of a new Server
+func TestServerInitHandler(t *testing.T) {
+
+	serverConfig := MakeServerTestConfig(1, 1)
+	serverConfig.Port = 55556
+
+	serv, err := newServer(serverConfig)
+
+	assert.NotNil(t, serv)
+	assert.Nil(t, err)
+
+}