使用ExampleTest进行测试-预期输出不匹配

Question

Running tool: /usr/local/go/bin/go test -timeout 30s -run ^(ExampleBuild)$

--- FAIL: ExampleBuild (0.00s)
got:
POST localhost/status?t=1 HTTP/1.1
Content-Type: application/json
want:
POST localhost/status?t=1 HTTP/1.1
Content-Type: application/json
FAIL
exit status 1

I'm trying to write test in go using the Example method. I have created a http request with header (Content-Type: application/json), query param t=1, method type POST and URL localhost.

The output in got: and want: looks to be the same, have also checked for whitespace characters. Not able to figure out what is the difference between these two here.

Not able to figure out what am I missing here.

import (
   "fmt"
   "net/http"
   "net/http/httputil"
)

func ExampleBuild() {

    req, err := http.NewRequest(http.MethodPost, "localhost/status?t=1", nil)
    req.Header.Add("content-type", "application/json")
    if err != nil {
        panic(err)
    }

    str, err := httputil.DumpRequest(req, false)
    if err != nil {
        panic(err)
    }
    fmt.Printf("%s", string(str))
    // Output:
    // POST localhost/status?t=1 HTTP/1.1
    // Content-Type: application/json

}

Answer 1

I think what's happening is that the HTTP header has for its line break. So this is what httputil.DumpRequest returns. But you're probably editing this file on a machine that doesn't use for line breaks, so the difference comes from there.

A brute-force way to compare successfully would be:

fmt.Println(strings.Replace(string(str), "", "", -1))

Which removes the ""s from the string dumped by HTTP and it will compare successfully if your editor used only " " to break the expected output.

A more elegant solution would depend on the specifics of your testing environment(s).