How to use TestDoAndReturn method of gomock_test Package

Best Mock code snippet using gomock_test.TestDoAndReturn

controller_test.go

Source: controller_test.go Github

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...434 t.Error("Do callback received wrong argument.")435 }436 ctrl.Finish()437}438func TestDoAndReturn(t *testing.T) {439 _, ctrl := createFixtures(t)440 subject := new(Subject)441 doCalled := false442 var argument string443 wantArg := "argument"444 ctrl.RecordCall(subject, "FooMethod", wantArg).DoAndReturn(445 func(arg string) int {446 doCalled = true447 argument = arg448 return 5449 })450 if doCalled {451 t.Error("Do() callback called too early.")452 }...

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TestDoAndReturn

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1import (2func TestDoAndReturn(t *testing.T) {3 ctrl := gomock.NewController(t)4 defer ctrl.Finish()5 mock := NewMockDoAndReturn(ctrl)6 mock.EXPECT().DoAndReturn(1, 2).DoAndReturn(func(x, y int) int {7 })8 fmt.Println(mock.DoAndReturn(1, 2))9}10This is a very useful feature of gomock. You can do some setup, call the function and then verify the result. You can also use gomock.Any() in place of 1 and 2. gomock.Any() is a special value which matches any value. So, you can write the above code as:11mock.EXPECT().DoAndReturn(gomock.Any(), gomock.Any()).DoAndReturn(func(x, y int) int {12 })

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TestDoAndReturn

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1import (2func TestDoAndReturn(t *testing.T) {3 ctrl := gomock.NewController(t)4 defer ctrl.Finish()5 mock := NewMockMyInterface(ctrl)6 mock.EXPECT().Do().DoAndReturn(func() int {7 fmt.Println("DoAndReturn called")8 })9 fmt.Println(mock.Do())10}11import (12func TestDoAndReturnWithMultipleReturnValues(t *testing.T) {13 ctrl := gomock.NewController(t)14 defer ctrl.Finish()15 mock := NewMockMyInterface(ctrl)16 mock.EXPECT().Do().DoAndReturn(func() (int, error) {17 fmt.Println("DoAndReturn called")18 })19 fmt.Println(mock.Do())20}21import (22func TestDoAndReturnWithArguments(t *testing.T) {23 ctrl := gomock.NewController(t)24 defer ctrl.Finish()

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TestDoAndReturn

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1import (2func TestDoAndReturn(t *testing.T) {3 ctrl := gomock.NewController(t)4 defer ctrl.Finish()5 mock := NewMockFoo(ctrl)6 mock.EXPECT().Do().DoAndReturn(func() {7 fmt.Println("Hello")8 })9 mock.Do()10}11import (12func TestDo(t *testing.T) {13 ctrl := gomock.NewController(t)14 defer ctrl.Finish()15 mock := NewMockFoo(ctrl)16 mock.EXPECT().Do().Do(func() {17 fmt.Println("Hello")18 })19 mock.Do()20}21import (22func TestDoAndReturn(t *testing.T) {23 ctrl := gomock.NewController(t)24 defer ctrl.Finish()25 mock := NewMockFoo(ctrl)26 mock.EXPECT().Do().DoAndReturn(func() {27 fmt.Println("Hello")28 })29 mock.Do()30}31import (32func TestDo(t *testing.T) {33 ctrl := gomock.NewController(t)34 defer ctrl.Finish()35 mock := NewMockFoo(ctrl)36 mock.EXPECT().Do().Do(func() {37 fmt.Println("Hello")38 })39 mock.Do()40}

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TestDoAndReturn

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1import (2func main() {3 ctrl := gomock.NewController(nil)4 defer ctrl.Finish()5 mock := gomock_test.NewMockDoer(ctrl)6 mock.EXPECT().Do().DoAndReturn(func() string {7 fmt.Println("Do called")8 })9 fmt.Println(mock.Do())10}11import (12func main() {13 ctrl := gomock.NewController(nil)14 defer ctrl.Finish()15 mock := gomock_test.NewMockDoer(ctrl)16 mock.EXPECT().Do().DoAndReturn(func() string {17 fmt.Println("Do called")18 })19 mock.Do()20}21import (22func main() {23 ctrl := gomock.NewController(nil)24 defer ctrl.Finish()25 mock := gomock_test.NewMockDoer(ctrl)26 mock.EXPECT().DoWithArgs("Hello world").DoAndReturn(func(s string) string {27 fmt.Println("DoWithArgs called with ", s)28 })29 fmt.Println(mock.DoWithArgs("Hello world"))30}31import (32func main() {33 ctrl := gomock.NewController(nil)34 defer ctrl.Finish()35 mock := gomock_test.NewMockDoer(ctrl)36 mock.EXPECT().DoWithArgs("Hello world").DoAndReturn(func(s string) string {

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TestDoAndReturn

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1func TestDoAndReturn(t *testing.T) {2 ctrl := gomock.NewController(t)3 defer ctrl.Finish()4 mock := NewMockMyInterface(ctrl)5 mock.EXPECT().Do().DoAndReturn(func() string {6 })7 fmt.Println(mock.Do())8}9func TestDoAndReturn(t *testing.T) {10 ctrl := gomock.NewController(t)11 defer ctrl.Finish()12 mock := NewMockMyInterface(ctrl)13 mock.EXPECT().Do().DoAndReturn(func() string {14 })15 fmt.Println(mock.Do())16}

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TestDoAndReturn

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1func TestDoAndReturn(t *testing.T) {2 mockCtrl := gomock.NewController(t)3 defer mockCtrl.Finish()4 mock := NewMockMyInterface(mockCtrl)5 mock.EXPECT().DoSomething().DoAndReturn(func() error {6 return errors.New("some error")7 })8 err := mock.DoSomething()9 if err == nil {10 t.Fatal("Expected error, got nil")11 }12}13func TestReturn(t *testing.T) {14 mockCtrl := gomock.NewController(t)15 defer mockCtrl.Finish()16 mock := NewMockMyInterface(mockCtrl)17 mock.EXPECT().DoSomething().Return(errors.New("some error"))18 err := mock.DoSomething()19 if err == nil {20 t.Fatal("Expected error, got nil")21 }22}23func TestDo(t *testing.T) {24 mockCtrl := gomock.NewController(t)25 defer mockCtrl.Finish()26 mock := NewMockMyInterface(mockCtrl)27 mock.EXPECT().DoSomething().Do(func() error {28 return errors.New("some error")29 })30 err := mock.DoSomething()31 if err == nil {32 t.Fatal("Expected error, got nil")33 }34}35func TestDoAndReturn2(t *testing.T) {36 mockCtrl := gomock.NewController(t)37 defer mockCtrl.Finish()38 mock := NewMockMyInterface(mockCtrl)39 mock.EXPECT().DoSomething().DoAndReturn(func() error {40 return errors.New("some error")41 })42 err := mock.DoSomething()43 if err == nil {44 t.Fatal("Expected error, got nil")45 }46}47func TestDoAndReturn3(t *testing.T) {48 mockCtrl := gomock.NewController(t)49 defer mockCtrl.Finish()50 mock := NewMockMyInterface(mockCtrl)51 mock.EXPECT().DoSomething().DoAndReturn(func() error {52 return errors.New("some error")53 })

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1func TestDoAndReturn(t *testing.T) {2 ctrl := gomock.NewController(t)3 defer ctrl.Finish()4 mock := NewMockMyInterface(ctrl)5 mock.EXPECT().DoSomething().DoAndReturn(func() string {6 })7 fmt.Println(mock.DoSomething())8}9func TestDoAndReturn(t *testing.T) {10 ctrl := gomock.NewController(t)11 defer ctrl.Finish()12 mock := NewMockMyInterface(ctrl)13 mock.EXPECT().DoSomething().DoAndReturn(func() string {14 })15 fmt.Println(mock.DoSomething())16}17func TestDoAndReturn(t *testing.T) {18 ctrl := gomock.NewController(t)19 defer ctrl.Finish()20 mock := NewMockMyInterface(ctrl)21 mock.EXPECT().DoSomething().DoAndReturn(func() string {22 })23 fmt.Println(mock.DoSomething())24}25func TestDoAndReturn(t *testing.T) {26 ctrl := gomock.NewController(t)27 defer ctrl.Finish()28 mock := NewMockMyInterface(ctrl)29 mock.EXPECT().DoSomething().DoAndReturn(func() string {30 })31 fmt.Println(mock.DoSomething())32}33func TestDoAndReturn(t *testing.T) {34 ctrl := gomock.NewController(t)35 defer ctrl.Finish()36 mock := NewMockMyInterface(ctrl)37 mock.EXPECT().DoSomething().DoAndReturn(func() string {38 })39 fmt.Println(mock.DoSomething())40}41func TestDoAndReturn(t *testing.T) {42 ctrl := gomock.NewController(t)43 defer ctrl.Finish()44 mock := NewMockMyInterface(ctrl)45 mock.EXPECT().DoSomething().DoAndReturn(func() string {46 })47 fmt.Println(mock.DoSomething())48}

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1import (2func main() {3 mockCtrl := gomock.NewController(t)4 defer mockCtrl.Finish()5 mock := test1.NewMocktest(mockCtrl)6 mock.EXPECT().DoAndReturn(gomock.Any()).DoAndReturn(func(i int) int {7 })8 fmt.Println(mock.DoAndReturn(5))9}10import (11func main() {12 mockCtrl := gomock.NewController(t)13 defer mockCtrl.Finish()14 mock := test1.NewMocktest(mockCtrl)15 mock.EXPECT().DoAndReturn(gomock.Any()).DoAndReturn(func(i int) int {16 })17 fmt.Println(mock.DoAndReturn(5))18}19import (20func main() {21 mockCtrl := gomock.NewController(t)22 defer mockCtrl.Finish()23 mock := test1.NewMocktest(mockCtrl)24 mock.EXPECT().DoAndReturn(gomock.Any()).DoAndReturn(func(i int) int {25 })26 fmt.Println(mock.DoAndReturn(5))27}28import (29func main() {30 mockCtrl := gomock.NewController(t)31 defer mockCtrl.Finish()32 mock := test1.NewMocktest(mockCtrl)33 mock.EXPECT().DoAndReturn(gomock.Any()).DoAndReturn(func(i int) int {34 })35 fmt.Println(mock.DoAndReturn(5))36}37import (

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TestDoAndReturn

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1func TestDoAndReturn(t *testing.T) {2 mockCtrl := gomock.NewController(t)3 defer mockCtrl.Finish()4 mockObj := mock_gomock.NewMockInterface(mockCtrl)5 mockObj.EXPECT().Do().DoAndReturn(func() error {6 return errors.New("some error")7 })8 err := mockObj.Do()9 if err == nil {10 t.Fail()11 }12}13func TestReturn(t *testing.T) {14 mockCtrl := gomock.NewController(t)15 defer mockCtrl.Finish()16 mockObj := mock_gomock.NewMockInterface(mockCtrl)17 mockObj.EXPECT().Do().Return(errors.New("some error"))18 err := mockObj.Do()19 if err == nil {20 t.Fail()21 }22}23func TestReturn(t *testing.T) {24 mockCtrl := gomock.NewController(t)25 defer mockCtrl.Finish()26 mockObj := mock_gomock.NewMockInterface(mockCtrl)27 mockObj.EXPECT().Do().Return(nil)28 err := mockObj.Do()29 if err != nil {30 t.Fail()31 }32}33func TestDoAndReturn(t *testing.T) {34 mockCtrl := gomock.NewController(t)35 defer mockCtrl.Finish()36 mockObj := mock_gomock.NewMockInterface(mockCtrl)37 mockObj.EXPECT().Do().DoAndReturn(func() error {38 })39 err := mockObj.Do()40 if err != nil {41 t.Fail()42 }43}44func TestDoAndReturn(t *testing.T)

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1import (2func TestDoAndReturn(t *testing.T) {3 ctrl := gomock.NewController(t)4 defer ctrl.Finish()5 mock := mock_gomock.NewMockDemo(ctrl)6 mock.EXPECT().Do("hello").Return("hello world")7 fmt.Println(mock.Do("hello"))8}9--- PASS: TestDoAndReturn (0.00s)10import (11func TestDoAndReturnWithMultipleReturnValues(t *testing.T) {12 ctrl := gomock.NewController(t)13 defer ctrl.Finish()14 mock := mock_gomock.NewMockDemo(ctrl)15 mock.EXPECT().Do("hello").Return("hello world", nil)16 fmt.Println(mock.Do("hello"))17}18--- PASS: TestDoAndReturnWithMultipleReturnValues (0.00s)

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