C# 如何为wait _propertyRepository.UnitOfWork.SaveEntitiesAsync（）创建xUnit测试用例？

如何测试

return await\u propertyRepository.UnitOfWork.SaveEntitiesAsync（）

AddCommandHandler
AddCommandHandlerTests.cs
您需要使用模拟的DBContext模拟UnitOfWork属性。然后需要在模拟的DbContext上设置（）saveEntityAsync（），如下_unitofwork.setup（x=>x.saveEntityAsync（默认值（CancellationToken））？但我还是感到困惑。如果有人与此相关，请给我举个例子？
public async Task<bool> Handle(AddCommand message, CancellationToken cancellationToken)
{

    _logger.LogInformation("----- Adding Property - Property: {@Property}", property);

    _propertyRepository.Add(property);

    return await _propertyRepository.UnitOfWork.SaveEntitiesAsync();
}

public class PropertyRepository : IPropertyRepository
    {
        private readonly RealxContext _realxContext;

        public IUnitOfWork UnitOfWork
        {
            get
            {
                return _realxContext;
            }
        }

        public PropertyRepository(RealxContext realxContext)
        {
            _realxContext = realxContext ?? throw new ArgumentNullException(nameof(realxContext));

        }

_propertyRepository.Setup(propertyRepo => propertyRepo.UnitOfWork.SaveEntitiesAsync(default(CancellationToken))).Returns(Task.FromResult(true));