Function upload

api/application_test.go:677–692

A modified version of https://stackoverflow.com/a/20397167/4244993 from Attila O.

(values map[string]*os.File)

// A modified version of https://stackoverflow.com/a/20397167/4244993 from Attila O.
func upload(values map[string]*os.File) (contentType string, buffer bytes.Buffer, err error) {
	w := multipart.NewWriter(&buffer)
	for key, r := range values {
		var fw io.Writer
		if fw, err = w.CreateFormFile(key, r.Name()); err != nil {
			return contentType, buffer, err
		}

		if _, err = io.Copy(fw, r); err != nil {
			return contentType, buffer, err
		}
	}
	contentType = w.FormDataContentType()
	w.Close()
	return contentType, buffer, err
}

func mustOpen(f string) *os.File {
	r, err := os.Open(f)