Added tests for v322 migration

Author: Mithilesh Gupta

models/migrations/v1_25/v322_test.go

@@ -0,0 +1,41 @@
+// Copyright 2025 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_25
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/migrations/base"
+	"code.gitea.io/gitea/modules/setting"
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_ExtendCommentTreePathLength(t *testing.T) {
+	if setting.Database.Type.IsSQLite3() {
+		t.Skip("For SQLITE, varchar or char will always be represented as TEXT")
+	}
+
+	type Comment struct {
+		ID       int64  `xorm:"pk autoincr"`
+		TreePath string `xorm:"VARCHAR(500)"`
+	}
+
+	x, deferable := base.PrepareTestEnv(t, 0, new(Comment))
+	defer deferable()
+
+	assert.NoError(t, ExtendCommentTreePathLength(x))
+
+	tables, err := x.DBMetas()
+	assert.NoError(t, err)
+
+	for _, table := range tables {
+		switch table.Name {
+		case "comment":
+			column := table.GetColumn("tree_path")
+			assert.NotNil(t, column)
+			assert.Equal(t, "VARCHAR", column.SQLType.Name)
+			assert.Equal(t, 4000, column.Length)
+		}
+	}
+}