uno.xamarin.essentials/Tests/SecureStorage_Tests.cs

using System.Threading.Tasks;
using Xamarin.Essentials;
using Xunit;

namespace Tests
{
    public class SecureStorage_Tests
    {
        [Fact]
        public async Task SecureStorage_LoadAsync_Fail_On_NetStandard()
        {
            await Assert.ThrowsAsync<NotImplementedInReferenceAssemblyException>(() => SecureStorage.GetAsync("key"));
        }

        [Fact]
        public async Task SecureStorage_SaveAsync_Fail_On_NetStandard()
        {
            await Assert.ThrowsAsync<NotImplementedInReferenceAssemblyException>(() => SecureStorage.SetAsync("key", "data"));
        }
    }
}