1// Copyright 2020 Google LLC 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// https://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15package fake 16 17import ( 18 "context" 19 "net" 20 "testing" 21 22 translate "cloud.google.com/go/translate/apiv3" 23 "google.golang.org/api/option" 24 translatepb "google.golang.org/genproto/googleapis/cloud/translate/v3" 25 "google.golang.org/grpc" 26) 27 28// fakeTranslationServer respresents a fake gRPC server where all of the methods 29// are unimplemented except TranslateText which is explicitly overridden. 30type fakeTranslationServer struct { 31 translatepb.UnimplementedTranslationServiceServer 32} 33 34func (f *fakeTranslationServer) TranslateText(ctx context.Context, req *translatepb.TranslateTextRequest) (*translatepb.TranslateTextResponse, error) { 35 resp := &translatepb.TranslateTextResponse{ 36 Translations: []*translatepb.Translation{ 37 {TranslatedText: "Hello World"}, 38 }, 39 } 40 return resp, nil 41} 42 43func TestTranslateTextWithConcreteClient(t *testing.T) { 44 ctx := context.Background() 45 46 // Setup the fake server. 47 fakeTranslationServer := &fakeTranslationServer{} 48 l, err := net.Listen("tcp", "localhost:0") 49 if err != nil { 50 t.Fatal(err) 51 } 52 gsrv := grpc.NewServer() 53 translatepb.RegisterTranslationServiceServer(gsrv, fakeTranslationServer) 54 fakeServerAddr := l.Addr().String() 55 go func() { 56 if err := gsrv.Serve(l); err != nil { 57 panic(err) 58 } 59 }() 60 61 // Create a client. 62 client, err := translate.NewTranslationClient(ctx, 63 option.WithEndpoint(fakeServerAddr), 64 option.WithoutAuthentication(), 65 option.WithGRPCDialOption(grpc.WithInsecure()), 66 ) 67 if err != nil { 68 t.Fatal(err) 69 } 70 71 // Run the test. 72 text, err := TranslateTextWithConcreteClient(client, "Hola Mundo", "en-US") 73 if err != nil { 74 t.Fatal(err) 75 } 76 if text != "Hello World" { 77 t.Fatalf("got %q, want Hello World", text) 78 } 79} 80