Goでテストを書くために、まずinterfaceを設計するということ - Qiita

var awssess = newSession() var s3Client = newS3Client() const defaultRegion = "ap-northeast-1" func newSession() *session.Session { return session.Must(session.NewSessionWithOptions(session.Options{ SharedConfigState: session.SharedConfigEnable, })) } func newS3Client() *s3.S3 { return s3.New(awssess, &aws.Config{ Region: aws.String(defaultRegion), }) } func readObject(bucket, key string) ([]byte,