unit-testing - Golang 模拟函数被调用两次

Question

我正在编写用于测试 main.go 的单元测试，并在函数内部调用 Get 函数 ( DeviceRepo.Get() ) 两次，然后我想模拟返回不同的 Get 函数，但我可以在第一次模拟时模拟它调用了，所以我不知道如何在第二次模拟 Get 函数？

main.go:

type DeviceInterface interface {}
type DeviceStruct struct{}

var DeviceRepo repositories.DeviceRepoInterface =  &repositories.DeviceRepoStruct{}

func (d *DeviceStruct) CheckDevice(familyname string, name string, firmwareversion string) string {
deviceList, deviceListErr := DeviceRepo.Get(familyname, name, firmwareversion)

if deviceListErr != "" {
    return "some error"
}

if len(deviceList) == 0 {
    deviceList, _ := DeviceRepo.Get(familyname, name, "")

    if len(deviceList) > 0 {
        return "Invalid firmware version."
    } else {
        return "Unknown device."
    }
}

return "Success"
}

main_test.go:

  type MockGetDeviceList struct {
    returnResult []resources.DeviceListDataReturn
    returnError  string
  }

  func (m *MockGetDeviceList) Get(familyName string, name string, firmwareVersion string) ([]resources.DeviceListDataReturn, string) {
    return m.returnResult, m.returnError
  }

  func Test_CheckDevice_WrongFirmwareVersion(t *testing.T) {
   Convey("Test_CheckDevice_WrongFirmwareVersion", t, func() {
    familyNameMock := "A"
    nameMock := "A"
    firmwareVersionMock := "3"

    mockReturnData := []resources.DeviceListDataReturn{}

    mockReturnDataSecond := []resources.DeviceListDataReturn{
        {
            FamilyName:      "f",
            Name:            "n",
            FirmwareVersion: "1.0",
        },
    }

    deviceModel := DeviceStruct{}

    getDeviceList := DeviceRepo
    defer func() { DeviceRepo = getDeviceList }()
    DeviceRepo = &MockGetDeviceList{returnResult: mockReturnData}

    getDeviceList = DeviceRepo
    defer func() { DeviceRepo = getDeviceList }()
    DeviceRepo = &MockGetDeviceList{returnResult: mockReturnDataSecond}

    expectReturn := "Invalid firmware version."

    actualResponse := deviceModel.CheckDevice(familyNameMock, nameMock, firmwareVersionMock)

    Convey("Checking check-device wrong firmware version", func() {
        So(actualResponse, ShouldEqual, expectReturn)
    })
})
}

我想模拟 Get 函数 return []resources.DeviceListDataReturn{} 第一次然后 return []resources.DeviceListDataReturn{{ 姓氏:“f”， 名称:“n”， 固件版本:“1.0”， }, } 在第二次。

Answer 1

您可以使用 https://pkg.go.dev/github.com/stretchr/testify/mock#Call.Once

mock.On("Get", mock.Anything).Return(mockReturnData).Once()
mock.On("Get", mock.Anything).Return(mockReturnData2).Once()

或者如果你知道你可以传递什么参数那么你可以这样做

mock.On("Get", "lastName", "name", "version").Return(mockReturnData)
mock.On("Get", "lastName_2", "name_2", "version_2").Return(mockReturnData2)