How to build mock class in golang?

huangapple
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英文:

How to build mock class in golang?

问题

我正在尝试在Golang中为单元测试构建模拟类，有人知道如何做吗？例如，在下面的代码片段中，我想打印出FakeMyClass.Object的返回值。

  1. package main
  3. import (
  4.     "fmt"
  5. )
  7. type MyClass struct {
  8. }
  10. func (*MyClass) Object() int {
  11.     return 0
  12. }
  14. func (mc *MyClass) PrintInfo() {
  15.     fmt.Printf("%v\n", mc.Object())
  16. }
  18. type FakeMyClass struct {
  19.     MyClass
  20. }
  22. func (*FakeMyClass) Object() int {
  23.     return 1
  24. }
  26. func main() {
  27.     mc := &FakeMyClass{}
  28.     mc.PrintInfo()
  29. }
英文:

I'm trying to build mock class for unit test in golang; does anyone know how to do that? For example, in the following code slice, I'd like to print FakeMyClass.Object's return value.

  1. package main
  3. import (
  4.     "fmt"
  5. )
  7. type MyClass struct {
  8. }
  10. func (*MyClass) Object() (int) {
  11.     return 0
  12. }
  14. func (mc *MyClass) PrintInfo() {
  15.     fmt.Printf("%v\n", mc.Object())
  16. }
  18. type FakeMyClass struct {
  19.     MyClass
  20. }
  22. func (*FakeMyClass) Object() (int) {
  23.     return 1
  24. }
  26. func main() {
  27.     mc := &FakeMyClass{}
  28.     mc.PrintInfo()
  29. }

答案1

得分: 2

我更喜欢使用github.com/stretchr/testify/tree/master/mock

  1. package main
  3. import (
  4.     "fmt"
  5.     "github.com/stretchr/testify/mock"
  6. )
  8. type MyClass struct {
  9. }
  11. func (*MyClass) Object() (int) {
  12.     return 0
  13. }
  15. func (mc *MyClass) PrintInfo() {
  16.     fmt.Printf("%v\n", mc.Object())
  17. }
  19. type FakeMyClass struct {
  20.     mock.Mock
  21. }
  23. func (fmc *FakeMyClass) Object() (int) {
  24.     args := fmc.Called()
  25.     return args.Int(0)
  26. }
  27. func (fmc *FakeMyClass) PrintInfo() {
  28.     fmt.Printf("%v\n", fmc.Object())
  29. }
  31. func main() {
  32.     mc := &FakeMyClass{}
  33.     mc.On("Object").Return(1)
  34.     mc.PrintInfo()
  35.     //mc.AssertExpectations(t)
  36. }
英文:

I prefer to use github.com/stretchr/testify/tree/master/mock

  1. package main
  3. import (
  4.     "fmt"
  5.     "github.com/stretchr/testify/mock"
  6. )
  8. type MyClass struct {
  9. }
  11. func (*MyClass) Object() (int) {
  12.     return 0
  13. }
  15. func (mc *MyClass) PrintInfo() {
  16.     fmt.Printf("%v\n", mc.Object())
  17. }
  19. type FakeMyClass struct {
  20.     mock.Mock
  21. }
  23. func (fmc *FakeMyClass) Object() (int) {
  24.     args := fmc.Called()
  25.     return args.Int(0)
  26. }
  27. func (fmc *FakeMyClass) PrintInfo() {
  28.     fmt.Printf("%v\n", fmc.Object())
  29. }
  31. func main() {
  32.     mc := &FakeMyClass{}
  33.     mc.On("Object").Return(1)
  34.     mc.PrintInfo()
  35.     //mc.AssertExpectations(t)
  36. }

答案2

得分: 1

我用mockgen来实现：

mockgen -source myModule.go -package myPackage -destination myModuleMock.go

你可以通过以下方式安装它：
go get github.com/golang/mock

英文:

I used mockgen for it:

mockgen -source myModule.go -package myPackage -destination myModuleMock.go

You can install it by:
got get github.com/golang/mock

答案3

得分: 0

你可以创建一个返回模拟函数的结构体，在每个测试用例中传入你想要返回的值。例如：

  1. package main
  3. import (
  4.     "fmt"
  5. )
  7. type MyClass struct{}
  9. func (*MyClass) Object() int {
  10.     return 0
  11. }
  12. func (mc *MyClass) PrintInfo() {
  13.     fmt.Printf("%v\n", mc.Object())
  14. }
  16. type FakeMyClass struct {
  17.      ObjectMock func() int
  18. }
  20. func (fm *FakeMyClass) Object() int {
  21.     return fm.ObjectMock()
  22. }
  23. func (fm *FakeMyClass) PrintInfo() {
  24.     fmt.Printf("%v\n", fm.Object())
  25. }
  27. func main() {
  29.     mc := &FakeMyClass{
  30.         // 在这里创建模拟函数，在调用 Object() 函数时将被调用。
  31.         ObjectMock: func() int {
  32.             return 0
  33.         },
  34.     }
  36.     mc.PrintInfo()
  37. }

这段代码展示了如何创建一个模拟函数的结构体，并在调用 Object() 函数时使用模拟函数返回值。

英文:

You can make a struct that returns mocked functions, which you pass in with each test case for values you want returned. For example:

  1. package main
  3. import (
  4.     "fmt"
  5. )
  7. type MyClass struct{}
  9. func (*MyClass) Object() int {
  10.     return 0
  11. }
  12. func (mc *MyClass) PrintInfo() {
  13.     fmt.Printf("%v\n", mc.Object())
  14. }
  16. type FakeMyClass struct {
  17.      ObjectMock: func() int
  18. }
  20. func (fm *FakeMyClass) Object() int {
  21.     return fm.ObjectMock()
  22. }
  23. func (fm *FakeMyClass) PrintInfo() {
  24.     fmt.Printf("%v\n", fm.Object())
  25. }
  27. func main() {
  29.     mc := &FakeMyClass{
  30.         // Create the mocked function here, to be called when the Object() function is called.
  31.         ObjectMock: func() int {
  32.             return 0
  33.         }
  34.     }
  36.     mc.PrintInfo()
  37. }

答案4

得分: 0

你正在寻找在Object()方法上进行虚拟调度。我所知道的Go语言中唯一的虚拟调度形式是使用接口。

PrintInfo将成为一个使用该接口类型的函数。

例如：

  1. package main
  3. import (
  4.     "fmt"
  5. )
  7. type WithObject interface {
  8.     Object() int
  9. }
  11. func PrintInfo(wo WithObject) {
  12.     fmt.Printf("%v\n", wo.Object())
  13. }
  15. type MyClass struct {
  16. }
  18. func (*MyClass) Object() int {
  19.     return 0
  20. }
  22. type FakeMyClass struct {
  23.     MyClass
  24. }
  26. func (*FakeMyClass) Object() int {
  27.     return 1
  28. }
  30. func main() {
  31.     fmc := &FakeMyClass{}
  32.     PrintInfo(fmc)
  33. }

希望这能帮到你！

英文:

You are looking for virtual dispatch on the Object() method. The only form of virtual dispatch that I know of in Go is to use interfaces.

PrintInfo will then be a function that uses that interface type.

E.g.:

  1. package main
  3. import (
  4.     "fmt"
  5. )
  7. type WithObject interface {
  8.     Object() int
  9. }
  11. func PrintInfo(wo WithObject) {
  12.     fmt.Printf("%v\n", wo.Object())
  13. }
  15. type MyClass struct {
  16. }
  18. func (*MyClass) Object() (int) {
  19.     return 0
  20. }
  22. type FakeMyClass struct {
  23.     MyClass
  24. }
  26. func (*FakeMyClass) Object() (int) {
  27.     return 1
  28. }
  30. func main() {
  31.     fmc := &FakeMyClass{}
  32.     PrintInfo(fmc)
  33. }

huangapple
  • 本文由 发表于 2016年9月6日 15:42:33
  • 转载请务必保留本文链接：https://go.coder-hub.com/39343282.html
  • go
  • unit-testing
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