refactor external snapshotter to use csi-lib-utils/rpc

cmd/csi-snapshotter/main_test.go

@@ -0,0 +1,161 @@
+/*
+Copyright 2019 The Kubernetes 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 main
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	"github.com/container-storage-interface/spec/lib/go/csi"
+	"github.com/golang/mock/gomock"
+	"github.com/kubernetes-csi/csi-lib-utils/connection"
+	"github.com/kubernetes-csi/csi-test/driver"
+
+	"google.golang.org/grpc"
+)
+
+func Test_supportsControllerCreateSnapshot(t *testing.T) {
+	tests := []struct {
+		name         string
+		output       *csi.ControllerGetCapabilitiesResponse
+		injectError  bool
+		expectError  bool
+		expectResult bool
+	}{
+		{
+			name: "success",
+			output: &csi.ControllerGetCapabilitiesResponse{
+				Capabilities: []*csi.ControllerServiceCapability{
+					{
+						Type: &csi.ControllerServiceCapability_Rpc{
+							Rpc: &csi.ControllerServiceCapability_RPC{
+								Type: csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME,
+							},
+						},
+					},
+					{
+						Type: &csi.ControllerServiceCapability_Rpc{
+							Rpc: &csi.ControllerServiceCapability_RPC{
+								Type: csi.ControllerServiceCapability_RPC_CREATE_DELETE_SNAPSHOT,
+							},
+						},
+					},
+				},
+			},
+			expectError:  false,
+			expectResult: true,
+		},
+		{
+			name:         "gRPC error",
+			output:       nil,
+			injectError:  true,
+			expectError:  true,
+			expectResult: false,
+		},
+		{
+			name: "no create snapshot",
+			output: &csi.ControllerGetCapabilitiesResponse{
+				Capabilities: []*csi.ControllerServiceCapability{
+					{
+						Type: &csi.ControllerServiceCapability_Rpc{
+							Rpc: &csi.ControllerServiceCapability_RPC{
+								Type: csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME,
+							},
+						},
+					},
+				},
+			},
+			expectError:  false,
+			expectResult: false,
+		},
+		{
+			name: "empty capability",
+			output: &csi.ControllerGetCapabilitiesResponse{
+				Capabilities: []*csi.ControllerServiceCapability{
+					{
+						Type: nil,
+					},
+				},
+			},
+			expectError:  false,
+			expectResult: false,
+		},
+		{
+			name: "no capabilities",
+			output: &csi.ControllerGetCapabilitiesResponse{
+				Capabilities: []*csi.ControllerServiceCapability{},
+			},
+			expectError:  false,
+			expectResult: false,
+		},
+	}
+
+	mockController, driver, _, controllerServer, csiConn, err := createMockServer(t)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer mockController.Finish()
+	defer driver.Stop()
+	defer csiConn.Close()
+
+	for _, test := range tests {
+
+		in := &csi.ControllerGetCapabilitiesRequest{}
+
+		out := test.output
+		var injectedErr error
+		if test.injectError {
+			injectedErr = fmt.Errorf("mock error")
+		}
+
+		// Setup expectation
+		controllerServer.EXPECT().ControllerGetCapabilities(gomock.Any(), in).Return(out, injectedErr).Times(1)
+
+		ok, err := supportsControllerCreateSnapshot(context.Background(), csiConn)
+		if test.expectError && err == nil {
+			t.Errorf("test %q: Expected error, got none", test.name)
+		}
+		if !test.expectError && err != nil {
+			t.Errorf("test %q: got error: %v", test.name, err)
+		}
+		if err == nil && test.expectResult != ok {
+			t.Errorf("test fail expected result %t but got %t\n", test.expectResult, ok)
+		}
+	}
+}
+
+func createMockServer(t *testing.T) (*gomock.Controller, *driver.MockCSIDriver, *driver.MockIdentityServer, *driver.MockControllerServer, *grpc.ClientConn, error) {
+	// Start the mock server
+	mockController := gomock.NewController(t)
+	identityServer := driver.NewMockIdentityServer(mockController)
+	controllerServer := driver.NewMockControllerServer(mockController)
+	drv := driver.NewMockCSIDriver(&driver.MockCSIDriverServers{
+		Identity:   identityServer,
+		Controller: controllerServer,
+	})
+	drv.Start()
+
+	// Create a client connection to it
+	addr := drv.Address()
+	csiConn, err := connection.Connect(addr)
+	if err != nil {
+		return nil, nil, nil, nil, nil, err
+	}
+
+	return mockController, drv, identityServer, controllerServer, csiConn, nil
+}