You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: httpcache_test.go
    path of file: ./repos/gitea/modules/httpcache
    
    the code of the file until where you have to start completion: // Copyright 2021 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package httpcache

import (
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
)

func countFormalHeaders(h http.Header) (c int) {
	for k := range h {
		// ignore our headers for internal usage
		if strings.HasPrefix(k, "X-Gitea-") {
			continue
		}
		c++
	}
	return c
}

func TestHandleGenericETagCache(t *testing.T) {
	etag := `"test"`

	t.Run("No_If-None-Match", func(t *testing.T) {
		req := &http.Request{Header: make(http.Header)}
		w := httptest.NewRecorder()

		handled := HandleGenericETagCache(req, w, etag)

		assert.False(t, handled)
		assert.Equal(t, 2, countFormalHeaders(w.Header()))
		assert.Contains(t, w.Header(), "Cache-Control")
		assert.Contains(t, w.Header(), "Etag")
		assert.Equal(t, etag, w.Header().Get("Etag"))
	})
	t.Run("Wrong_If-None-Match", func(t *testing.T) {
		req := &http.Request{Header: make(http.Header)}
		w
    
func TestHandleGenericETagCache(t *testing.T) {
	etag := `"test"`

	t.Run("No_If-None-Match", func(t *testing.T) {
		req := &http.Request{Header: make(http.Header)}
		w := httptest.NewRecorder()

		handled := HandleGenericETagCache(req, w, etag)

		assert.False(t, handled)
		assert.Equal(t, 2, countFormalHeaders(w.Header()))
		assert.Contains(t, w.Header(), "Cache-Control")
		assert.Contains(t, w.Header(), "Etag")
		assert.Equal(t, etag, w.Header().Get("Etag"))
	})
	t.Run("Wrong_If-None-Match", func(t *testing.T) {
		req := &http.Request{Header: make(http.Header)}
		w := httptest.NewRecorder()

		req.Header.Set("If-None-Match", `"wrong etag"`)

		handled := HandleGenericETagCache(req, w, etag)

		assert.False(t, handled)
		assert.Equal(t, 2, countFormalHeaders(w.Header()))
		assert.Contains(t, w.Header(), "Cache-Control")
		assert.Contains(t, w.Header(), "Etag")
		assert.Equal(t, etag, w.Header().Get("Etag"))
	})
	t.Run("Correct_If-None-Match", func(t *testing.T) {
		req := &http.Request{Header: make(http.Header)}
		w := httptest.NewRecorder()

		req.Header.Set("If-None-Match", etag)

		handled := HandleGenericETagCache(req, w, etag)

		assert.True(t, handled)
		assert.Equal(t, 1, countFormalHeaders(w.Header()))
		assert.Contains(t, w.Header(), "Etag")
		assert.Equal(t, etag, w.Header().Get("Etag"))
		assert.Equal(t, http.StatusNotModified, w.Code)
	})
	t.Run("Multiple_Wrong_If-None-Match", func(t *testing.T) {
		req := &http.Request{Header: make(http.Header)}
		w := httptest.NewRecorder()

		req.Header.Set("If-None-Match", `"wrong etag", "wrong etag "`)

		handled := HandleGenericETagCache(req, w, etag)

		assert.False(t, handled)
		assert.Equal(t, 2, countFormalHeaders(w.Header()))
		assert.Contains(t, w.Header(), "Cache-Control")
		assert.Contains(t, w.Header(), "Etag")
		assert.Equal(t, etag, w.Header().Get("Etag"))
	})
	t.Run("Multiple_Correct_If-None-Match", func(t *testing.T) {
		req := &http.Request{Header: make(http.Header)}
		w := httptest.NewRecorder()

		req.Header.Set("If-None-Match", `"wrong etag", `+etag)

		handled := HandleGenericETagCache(req, w, etag)

		assert.True(t, handled)
		assert.Equal(t, 1, countFormalHeaders(w.Header()))
		assert.Contains(t, w.Header(), "Etag")
		assert.Equal(t, etag, w.Header().Get("Etag"))
		assert.Equal(t, http.StatusNotModified, w.Code)
	})
}