如何测试点亮Android设备LED的代码？

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

    private Button btnToggle;
    private boolean isLightOn = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnToggle = findViewById(R.id.btn_toggle);
        btnToggle.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isLightOn) {
                    turnOffLight();
                } else {
                    turnOnLight();
                }
            }
        });
    }

    private void turnOnLight() {
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        isLightOn = true;
        btnToggle.setText("关闭LED灯");
        Toast.makeText(this, "LED灯已点亮", Toast.LENGTH_SHORT).show();
    }

    private void turnOffLight() {
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        isLightOn = false;
        btnToggle.setText("点亮LED灯");
        Toast.makeText(this, "LED灯已关闭", Toast.LENGTH_SHORT).show();
    }
}