[#13004] Add Timestamp to Tag list API (#13026)

* Add Timestamp to Tag list API

* Add unit test for ToCommitMeta

* Rename timestamp to created

* Reformat files

modules/convert/git_commit_test.go

@@ -0,0 +1,42 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package convert
+
+import (
+	"testing"
+	"time"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/git"
+	api "code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/util"
+
+	"github.com/go-git/go-git/v5/plumbing/object"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestToCommitMeta(t *testing.T) {
+	assert.NoError(t, models.PrepareTestDatabase())
+	headRepo := models.AssertExistsAndLoadBean(t, &models.Repository{ID: 1}).(*models.Repository)
+	sha1, _ := git.NewIDFromString("0000000000000000000000000000000000000000")
+	signature := &object.Signature{Name: "Test Signature", Email: "test@email.com", When: time.Unix(0, 0)}
+	tag := &git.Tag{
+		Name:    "Test Tag",
+		ID:      sha1,
+		Object:  sha1,
+		Type:    "Test Type",
+		Tagger:  signature,
+		Message: "Test Message",
+	}
+
+	commitMeta := ToCommitMeta(headRepo, tag)
+
+	assert.NotNil(t, commitMeta)
+	assert.EqualValues(t, &api.CommitMeta{
+		SHA:     "0000000000000000000000000000000000000000",
+		URL:     util.URLJoin(headRepo.APIURL(), "git/commits", "0000000000000000000000000000000000000000"),
+		Created: time.Unix(0, 0),
+	}, commitMeta)
+}