package main

import (
	"log"
	"net/http"
	"net/http/httptest"
	"sync"
	"testing"

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

func TestGinContextCancel(t *testing.T) {
	serv := httptest.NewServer(http.HandlerFunc(func(_ http.ResponseWriter, _ *http.Request) {
		return
	}))
	defer serv.Close()

	wg := &sync.WaitGroup{}

	r := gin.New()
	r.GET("/", func(ginctx *gin.Context) {
		wg.Add(1)

		ginctx = ginctx.Copy()

		// start async goroutine for calling serv
		go func() {
			defer wg.Done()

			req, err := http.NewRequestWithContext(ginctx, http.MethodGet, serv.URL, nil)
			if err != nil {
				panic(err)
			}

			res, err := http.DefaultClient.Do(req)
			if err != nil {
				// context is always canceled with gin v1.8.0, it is big breaking change with gin v1.7
				t.Error("context is always canceled with gin v1.8.0, it is big breaking change with gin v1.7", err) 
				return
			}

			if res.StatusCode != http.StatusOK {
				log.Println("unexpected status code ", res.Status)
				return
			}
		}()
	})
	go func() {
		err := r.Run(":8080")
		if err != nil {
			panic(err)
		}
	}()

	res, err := http.Get("http://127.1:8080/")
	if err != nil {
		panic(err)
	}

	if res.StatusCode != http.StatusOK {
		panic(err)
	}

	wg.Wait()
}