Add test for ExtendCommentTreePathLength migration and fix bugs (#35791)

Co-authored-by: Mithilesh Gupta <guptamithilesh@protonmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

models/migrations/base/tests.go

@@ -19,6 +19,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 	"xorm.io/xorm"
+	"xorm.io/xorm/schemas"
 )
 
 // FIXME: this file shouldn't be in a normal package, it should only be compiled for tests
@@ -88,6 +89,16 @@ func PrepareTestEnv(t *testing.T, skip int, syncModels ...any) (*xorm.Engine, fu
 	return x, deferFn
 }
 
+func LoadTableSchemasMap(t *testing.T, x *xorm.Engine) map[string]*schemas.Table {
+	tables, err := x.DBMetas()
+	require.NoError(t, err)
+	tableMap := make(map[string]*schemas.Table)
+	for _, table := range tables {
+		tableMap[table.Name] = table
+	}
+	return tableMap
+}
+
 func MainTest(m *testing.M) {
 	testlogger.Init()