// 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		}		if strings.HasPrefix(k, "X-Forgejo-") {			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 := 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)	})}