如何模拟一个返回别的东西的方法？

Question

我有一个单元测试需要模拟一个从数据库返回实体属性的方法。我将把我尝试过的一些代码放在这里。如果有人知道如何做，并希望帮助我是受欢迎的。感谢

这是接口，实现接口的类和实体模型：

namespace MoqExample
{
    public interface ISomeService
    {
        Customer GetCustomerById(int customerId);
    }

    public class SomeService : ISomeService
    {
        public Customer GetCustomerById(int customerId)
        {
            // Query database and return Customer;
            return Db.Customer.FirstOrDefault(c => c.id == customerId); 
        }
    }

    public class Customer
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public bool IsActive { get; set; }
    }
}

这是我的单元测试：

[TestMethod]
public void TestMyMethod()
{
    customer = new Customer();
    customer.Id = 1;
    customer. Name= "robert"
    customer.IsActive = true;

    // This works because is mocking a method that return a customer.
    this.Setup<ISomeService, Customer>(c => c.GetCustomerById(customerId)).Returns(task);

    // This doesn't work because is mocking the same method but here I want to return a property 
    this.Setup<ISomeService, bool>(c => c.GetCustomerById(customerId).IsActive).Returns(true);
}