1 files changed, 100 insertions, 0 deletions
diff --git a/modules/httpcache/httpcache_test.go b/modules/httpcache/httpcache_test.go
new file mode 100644
index 0000000..65a8a9b
--- /dev/null
+++ b/modules/httpcache/httpcache_test.go
@@ -0,0 +1,100 @@
+// 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)
+	})
+}