使用 Moq 模拟存储库

为了模拟存储库，我使用下面的代码。我不明白为什么变量empl总是null.

你知道我错过了什么吗？

Thanks,

[TestMethod]
public void Test()
{
    var employee = new Employee { EmployeeID = 1, Code = "Code", FirstName = "MyFirstName", LastName = "MyName" };

    var employeeRepository = new Mock<IEmployeeRepository>();
    employeeRepository.Setup(x => x.Add(employee)).Verifiable();

    var employeeService = new EmployeeService(employeeRepository.Object);
    var empl = employeeService.GetById(1);

    Assert.IsNotNull(empl);
}

public class Employee
{
    public int EmployeeID { get; set; }
    public string Code { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

public interface IEmployeeRepository : IBaseRepository<Employee> {}

public interface IBaseRepository<TEntity>
{
    IQueryable<TEntity> Get();
    TEntity Add(TEntity entity);
    void Delete(int id);
    int Count();
}

public class EmployeeService
{
    private IEmployeeRepository _employeeRepository;

    public EmployeeService(IEmployeeRepository employeeRepository)
    {
        _employeeRepository = employeeRepository;
    }

    public Employee GetById(int id)
    {
        return _employeeRepository.Get().FirstOrDefault(x => x.EmployeeID == id);
    }

    public void Add(Employee employee)
    {
        _employeeRepository.Add(employee);
    }
}

你在嘲笑错误的方法。嘲笑Get:

employeeRepository.Setup(x => x.Get()).Returns(new[] { employee });

模拟是一个假物体，它的方法没有任何逻辑。你必须tell it它到底应该如何表现（设置），以便在您的测试中可以重播此行为。