support the open-icon of folder (#34168) (#34896)

Backport #34168 by @kerwin612

Co-authored-by: Kerwin Bryant <kerwin612@qq.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/web/repo/treelist_test.go

@@ -4,9 +4,11 @@
 package repo
 
 import (
+	"html/template"
 	"testing"
 
 	pull_model "code.gitea.io/gitea/models/pull"
+	"code.gitea.io/gitea/modules/fileicon"
 	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/services/gitdiff"
 
@@ -14,7 +16,8 @@ import (
 )
 
 func TestTransformDiffTreeForWeb(t *testing.T) {
-	ret := transformDiffTreeForWeb(&gitdiff.DiffTree{Files: []*gitdiff.DiffTreeRecord{
+	renderedIconPool := fileicon.NewRenderedIconPool()
+	ret := transformDiffTreeForWeb(renderedIconPool, &gitdiff.DiffTree{Files: []*gitdiff.DiffTreeRecord{
 		{
 			Status:   "changed",
 			HeadPath: "dir-a/dir-a-x/file-deep",
@@ -29,6 +32,9 @@ func TestTransformDiffTreeForWeb(t *testing.T) {
 		"dir-a/dir-a-x/file-deep": pull_model.Viewed,
 	})
 
+	mockIconForFile := func(id string) template.HTML {
+		return template.HTML(`<svg class="svg git-entry-icon octicon-file" width="16" height="16" aria-hidden="true"><use xlink:href="#` + id + `"></use></svg>`)
+	}
 	assert.Equal(t, WebDiffFileTree{
 		TreeRoot: WebDiffFileItem{
 			Children: []*WebDiffFileItem{
@@ -44,6 +50,7 @@ func TestTransformDiffTreeForWeb(t *testing.T) {
 							NameHash:    "4acf7eef1c943a09e9f754e93ff190db8583236b",
 							DiffStatus:  "changed",
 							IsViewed:    true,
+							FileIcon:    mockIconForFile(`svg-mfi-file`),
 						},
 					},
 				},
@@ -53,6 +60,7 @@ func TestTransformDiffTreeForWeb(t *testing.T) {
 					FullName:    "file1",
 					NameHash:    "60b27f004e454aca81b0480209cce5081ec52390",
 					DiffStatus:  "added",
+					FileIcon:    mockIconForFile(`svg-mfi-file`),
 				},
 			},
 		},