VOL-1930 Unit test cases for cluster.go

Change-Id: Ic9c91a1bd891083bf9e46d8095dd1526a53b4d2a
diff --git a/internal/pkg/afrouter/cluster_test.go b/internal/pkg/afrouter/cluster_test.go
new file mode 100644
index 0000000..7bb1ce3
--- /dev/null
+++ b/internal/pkg/afrouter/cluster_test.go
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2019-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
+
+// Unit Test Backend manager that handles redundant connections per backend
+
+import (
+	"fmt"
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func makeBackendClusterConfig(numBackends int, numConnections int) *BackendClusterConfig {
+
+	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)
+	}
+
+	backendClusterConfig := BackendClusterConfig{
+		Name:     "ro_vcore",
+		Backends: backends,
+	}
+	return &backendClusterConfig
+}
+
+func TestNewBackendCluster(t *testing.T) {
+	backends := makeBackendClusterConfig(1, 1)
+	cluster, err := newBackendCluster(backends)
+	assert.NotNil(t, cluster)
+	assert.Nil(t, err)
+}
+
+func TestNewBackendClusterTwoOne(t *testing.T) {
+	backends := makeBackendClusterConfig(2, 1)
+	cluster, err := newBackendCluster(backends)
+	assert.NotNil(t, cluster)
+	assert.Nil(t, err)
+}
+
+func TestNewBackendClusterNoName(t *testing.T) {
+	backends := makeBackendClusterConfig(1, 1)
+	backends.Name = ""
+	backend, err := newBackendCluster(backends)
+	assert.Nil(t, backend)
+	assert.NotNil(t, err, "A backend cluster must have a name")
+}
+
+func TestNewBackendClusterBackendsNoName(t *testing.T) {
+	backends := makeBackendClusterConfig(1, 1)
+	backends.Backends[0].Name = ""
+	backend, err := newBackendCluster(backends)
+	assert.Nil(t, backend)
+	assert.NotNil(t, err, "A backend cluster must have a name")
+}
+
+func TestNewBackendClusterBackendsTwoNoName(t *testing.T) {
+	backends := makeBackendClusterConfig(2, 1)
+	//backends.Backends[0].Name = ""
+	backends.Backends[1].Name = ""
+	backend, err := newBackendCluster(backends)
+	assert.Nil(t, backend)
+	assert.NotNil(t, err, "A backend cluster must have a name")
+}