ui: fix go to citation button url (#4597)

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/4597
Reviewed-by: Ghost <twenty-panda@noreply.codeberg.org>
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Bram Hagens <bram@bramh.me>
Co-committed-by: Bram Hagens <bram@bramh.me>

tests/integration/repo_citation_test.go

@@ -0,0 +1,81 @@
+// Copyright 2024 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package integration
+
+import (
+	"net/http"
+	"net/url"
+	"strings"
+	"testing"
+
+	repo_model "code.gitea.io/gitea/models/repo"
+	unit_model "code.gitea.io/gitea/models/unit"
+	"code.gitea.io/gitea/models/unittest"
+	user_model "code.gitea.io/gitea/models/user"
+	files_service "code.gitea.io/gitea/services/repository/files"
+	"code.gitea.io/gitea/tests"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCitation(t *testing.T) {
+	onGiteaRun(t, func(t *testing.T, u *url.URL) {
+		user := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
+
+		session := loginUser(t, user.LoginName)
+
+		t.Run("No citation", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			repo, _, f := CreateDeclarativeRepo(t, user, "citation-no-citation", []unit_model.Type{unit_model.TypeCode}, nil, nil)
+			defer f()
+
+			testCitationButtonExists(t, session, repo, "", false)
+		})
+
+		t.Run("cff citation", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			repo, f := createRepoWithEmptyFile(t, user, "citation-cff", "CITATION.cff")
+			defer f()
+
+			testCitationButtonExists(t, session, repo, "CITATION.cff", true)
+		})
+
+		t.Run("bib citation", func(t *testing.T) {
+			defer tests.PrintCurrentTest(t)()
+
+			repo, f := createRepoWithEmptyFile(t, user, "citation-bib", "CITATION.bib")
+			defer f()
+
+			testCitationButtonExists(t, session, repo, "CITATION.bib", true)
+		})
+	})
+}
+
+func testCitationButtonExists(t *testing.T, session *TestSession, repo *repo_model.Repository, file string, exists bool) {
+	req := NewRequest(t, "GET", repo.HTMLURL())
+	resp := session.MakeRequest(t, req, http.StatusOK)
+	doc := NewHTMLParser(t, resp.Body)
+
+	doc.AssertElement(t, "#cite-repo-button", exists)
+
+	if exists {
+		href, exists := doc.doc.Find("#goto-citation-btn").Attr("href")
+		assert.True(t, exists)
+
+		assert.True(t, strings.HasSuffix(href, file))
+	}
+}
+
+func createRepoWithEmptyFile(t *testing.T, user *user_model.User, repoName, fileName string) (*repo_model.Repository, func()) {
+	repo, _, f := CreateDeclarativeRepo(t, user, repoName, []unit_model.Type{unit_model.TypeCode}, nil, []*files_service.ChangeRepoFile{
+		{
+			Operation: "create",
+			TreePath:  fileName,
+		},
+	})
+
+	return repo, f
+}