如何在Go中测试HTTP调用 [英] How to test http calls in go

问题描述

我有以下代码:

// HTTPPost to post json messages to the specified url
func HTTPPost(message interface{}, url string) (*http.Response, error) {
    jsonValue, err := json.Marshal(message)
    if err != nil {
        logger.Error("Cannot Convert to JSON: ", err)
        return nil, err
    }
    logger.Info("Calling http post with url: ", url)
    resp, err := getClient().Post(url, "application/json", bytes.NewBuffer(jsonValue))
    if err != nil {
        logger.Error("Cannot post to the url: ", url, err)
        return nil, err
    }
    err = IsErrorResp(resp, url)
    return resp, err
}

我想为此编写测试，但是我不确定如何使用httptest包.

I'd like to write the tests for this, but I am not sure how to use httptest package .

推荐答案

在这里看看:

https://golang.org/pkg/net/http/httptest/# example_Server

基本上，您可以使用httptest.NewServer函数创建一个新的模拟" http服务器.

Basically, you can create a new "mock" http server using httptest.NewServer function.

您可以让模拟服务器返回测试所需的任何响应，还可以让模拟服务器存储您的HTTPPost函数发出的请求以对其进行断言.

You can have your mock server return whatever response you need from the test, and you can also have your mock server store the request that your HTTPPost function made in order to assert over it.

func TestYourHTTPPost(t *testing.T){

    ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintln(w, `response from the mock server goes here`)
        // you can also inspect the contents of r (the request) to assert over it
    }))
    defer ts.Close()

    mockServerURL = ts.URL

    message := "the message you want to test"

    resp, err := HTTPPost(message, mockServerURL)

    // assert over resp and err here
}

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