I'm trying to use interfaces to test code that uses google's drive api lib.
type MyFile struct {
DownloadUrl string `json:"downloadUrl,omitempty"`
}
type MyFilesGetCall interface {
Do() (*MyFile, error)
// Do() (*drive.File, error) // this DOES work
}
type MyFilesService interface {
Get(string) *MyFilesGetCall
// Get(string) *drive.FilesGetCall // this DOES work
}
func GetInfo(id string, myService MyFilesService) {
myService.Get(id).Do()
}
func main() {
drive, _ := drive.New(new(http.Client))
GetInfo("id", drive.Files)
}
When I try to run this I get the following error:
$ go run so.go
./so.go:24: cannot use drive.Files (type *drive.FilesService) as type MyFilesService in argument to GetInfo:
*drive.FilesService does not implement MyFilesService (wrong type for Get method)
have Get(string) *drive.FilesGetCall
want Get(string) *MyFilesGetCall
./so.go:28: fService.Get(id).Do undefined (type *MyFilesGetCall has no field or method Do)
It seems that interfaces only work 1 level deep.
Can anyone recommend an alternative approach for mocking this dependency?
