Gin Redirection test fail when using httptest.ResponseRecorder

Description

The gin.Context.Redirect function panics when the gin.Context uses httptest.ResponseRecorder as its Writer.

A code to check the header code(https://github.com/golang/go/commit/c3931ab1b7bceddc56479d7ddbd7517d244bfe17) was added in April 2021, but the gin.Context.Render passes '-1' (https://github.com/gin-gonic/gin/blob/master/context.go#L976), not the code argument.

How to reproduce

package main

import (
    "github.com/gin-gonic/gin"
)

type fakeGinResponseWriter struct {
    httptest.ResponseRecorder
    http.Hijacker
}

func main() {
        ctx = &gin.Context{
            Request: &http.Request{
                URL:    &url.URL{},
                Header: http.Header{},
            },
            Writer: &fakeGinResponseWriter{},
        }
        ctx.Redirect(302, "http://foo.bar")
}

Environment

• go version: 1.17.6 darwin/amd64
• gin version (or commit ref): 1.7.7
• operating system: MacOS 12.3

Comment From: Fov6363

can change ? func (c *Context) Redirect(code int, location string) { c.Render(-1, render.Redirect{ Code: code, Location: location, Request: c.Request, }) }

to

func (c *Context) Redirect(code int, location string) { c.Render(code, render.Redirect{ Code: code, Location: location, Request: c.Request, }) }