rbd: add framework for CSI-Addons Identity Service

Add a new CSI-Addons Server and empty Identity Service for the RBD
plugin. The implementation of the Identity Service procedure calls will
be done in other PRs.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

internal/csi-addons/server/server_test.go

@@ -0,0 +1,52 @@
+/*
+Copyright 2021 The Ceph-CSI Authors.
+
+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 server
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewCSIAddonsServer(t *testing.T) {
+	t.Parallel()
+
+	t.Run("valid endpoint", func(t *testing.T) {
+		t.Parallel()
+
+		cas, err := NewCSIAddonsServer("unix:///tmp/csi-addons.sock")
+		require.NoError(t, err)
+		require.NotNil(t, cas)
+	})
+
+	t.Run("empty endpoint", func(t *testing.T) {
+		t.Parallel()
+
+		cas, err := NewCSIAddonsServer("")
+		require.Error(t, err)
+		assert.Nil(t, cas)
+	})
+
+	t.Run("no UDS endpoint", func(t *testing.T) {
+		t.Parallel()
+
+		cas, err := NewCSIAddonsServer("endpoint at /tmp/...")
+		require.Error(t, err)
+		assert.Nil(t, cas)
+	})
+}