// Copyright 2026 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package server

import (
	"testing"
	"time"

	"github.com/pingcap/tidb/pkg/config"
	"github.com/stretchr/testify/require"
)

func TestHealthHandler_StartPeriodicCheck_ZeroInterval(t *testing.T) {
	// Save original config
	originalCfg := config.GetGlobalConfig()
	defer config.StoreGlobalConfig(originalCfg)

	// Set interval to 0
	cfg := *originalCfg
	cfg.HealthCheckInterval = 0
	config.StoreGlobalConfig(&cfg)

	h := &HealthHandler{}

	// This should not panic
	require.NotPanics(t, func() {
		h.StartPeriodicCheck()
	})

	// Give the goroutine a moment to start and potentially panic
	time.Sleep(100 * time.Millisecond)

	h.StopPeriodicCheck()
}