如何启动Android.App？使用Nunit3的Specflow测试失败，并显示以下错误：“ OneTimeSetUp：未找到合适的构造函数”

Question

该应用程序无法启动。我认为故障是由于属性[TestFixture（Platform.Android）]和[OneTimeSetUp]中的某些东西而出现的。如何使用specflow启动App？

注意：该项目中的常规测试（不使用specflow）具有相同的固定装置设置。

using NUnit.Framework;
using Xamarin.UITest;
using Xamarin.UITest.Android;

namespace AAP.UITests
{
    [TestFixture(Platform.Android)]

    public class TestBase
    {
        protected AppManager appm;
        protected IApp app => AppManager.App;
        protected AndroidApp androidApp;
        protected bool OnAndroid => AppManager.Platform == Platform.Android;
        protected bool OniOS => AppManager.Platform == Platform.iOS;

        public TestBase(Platform platform)
        {
            AppManager.Platform = platform;
        }

        public TestBase()
            { }

        [OneTimeSetUp]

        public void BeforeEachTest()
        {
            AppManager.StartApp();
            appm = AppManager.Appm;

        }     
    }
}

I am using:
SpecFlow, SpecFlow.Nunit, SpecFlow.Tools.MsBuild.Generation - 3.0.199
NUnit, NUnit3TestAdapter - 3.12.0
Xamarin.UITest 2.2.7