测试Go http.Request.FormFile吗? [英] Testing Go http.Request.FormFile?

问题描述

尝试测试端点时如何设置Request.FormFile?

How do I set the Request.FormFile when trying to test an endpoint?

部分代码:

func (a *EP) Endpoint(w http.ResponseWriter, r *http.Request) {
    ...

    x, err := strconv.Atoi(r.FormValue("x"))
    if err != nil {
        a.ren.Text(w, http.StatusInternalServerError, err.Error())
        return
    }

    f, fh, err := r.FormFile("y")
    if err != nil {
        a.ren.Text(w, http.StatusInternalServerError, err.Error())
        return
    }
    defer f.Close()
    ...
}

如何使用httptest库生成具有可以在FormFile中获得的值的帖子请求?

How do I use the httptest lib to generate a post request that has value that I can get in FormFile?

推荐答案

如果您查看 FormFile 函数的实现，您会发现它读取了公开的 MultipartForm 字段.

If you have a look at the implementation of the FormFile function you'll see that it reads the exposed MultipartForm field.

https://golang.org/src/净/http/request.go?s=39022:39107#L1249

        // FormFile returns the first file for the provided form key.
  1258  // FormFile calls ParseMultipartForm and ParseForm if necessary.
  1259  func (r *Request) FormFile(key string) (multipart.File, *multipart.FileHeader, error) {
  1260      if r.MultipartForm == multipartByReader {
  1261          return nil, nil, errors.New("http: multipart handled by MultipartReader")
  1262      }
  1263      if r.MultipartForm == nil {
  1264          err := r.ParseMultipartForm(defaultMaxMemory)
  1265          if err != nil {
  1266              return nil, nil, err
  1267          }
  1268      }
  1269      if r.MultipartForm != nil && r.MultipartForm.File != nil {
  1270          if fhs := r.MultipartForm.File[key]; len(fhs) > 0 {
  1271              f, err := fhs[0].Open()
  1272              return f, fhs[0], err
  1273          }
  1274      }
  1275      return nil, nil, ErrMissingFile
  1276  }

在测试中，您应该能够创建 multipart.Form 的测试实例并将其分配给您的请求对象-

In your test you should be able to create a test instance of multipart.Form and assign it to your request object - https://golang.org/pkg/mime/multipart/#Form

type Form struct {
        Value map[string][]string
        File  map[string][]*FileHeader
}

当然，这需要您使用真实的文件路径，从测试的角度来看，这不是很好.为了解决这个问题，您可以定义一个接口来从请求对象中读取 FormFile ，并将模拟实现传递到您的 EP 结构中.

Of course this will require that you use a real filepath which isn't great from a testing perspective. To get around this you could define an interface to read FormFile from a request object and pass a mock implementation into your EP struct.

这是一篇很好的文章，其中包含一些有关如何执行此操作的示例:

Here is a good post with a few examples on how to do this: https://husobee.github.io/golang/testing/unit-test/2015/06/08/golang-unit-testing.html

这篇关于测试Go http.Request.FormFile吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！