Moq DbContext抛出Castle.DynamicProxy错误

如何解决Moq DbContext抛出Castle.DynamicProxy错误

我在.NET Core中有一个服务类，其承包商应与DbContext实例一起传递。我在Moq和Feature中使用xUnit。在测试类的构造函数中，我收到了Castle Dynamic Proxy错误

 Castle.DynamicProxy.InvalidProxyconstructorargumentsException
   HResult=0x80070057
   Message=Can not instantiate proxy of class: myApp.Data.Context.supplierContext.
 Could not find a parameterless constructor.
 Source=Castle.Core
 StackTrace:
   at Castle.DynamicProxy.proxygenerator.CreateClassproxyInstance(Type proxyType,List`1 proxyArguments,Type classtoProxy,Object[] constructorarguments)
  at Castle.DynamicProxy.proxygenerator.CreateClassproxy(Type classtoProxy,Type[] additionalInterfacesToProxy,proxygenerationoptions options,Object[] constructorarguments,IInterceptor[] interceptors)
 at Moq.CastleProxyFactory.CreateProxy(Type mockType,IInterceptor interceptor,Type[] interfaces,Object[] arguments)
 at Moq.Mock`1.InitializeInstance()
 at Moq.Mock`1.OnGetobject()
 at Moq.Mock.get_Object()
 at Moq.Mock`1.get_Object()

服务等级

public class supplierService : IsupplierService
{
    private readonly supplierContext _context;

    public supplierService(supplierContext context)
    {
        _context = context;
    }
 ....

测试班

public class supplierServiceTest
{
    private readonly IsupplierService sut;
    private readonly Mock<supplierContext> mocksupplierContext = new Mock<supplierContext>();

    public supplierServicetest()
    {
        sut = new supplierService(mocksupplierContext.Object); // get error here....
    }

    [Fact]
    public void Getsuppliers_ShouldReturnAllsuppliers()
    {
        //Arrange
        var fixture = new Fixture();
        var supplierDataMock = fixture.CreateMany<Task<supplier>>(6);

        //Act
        var actualDataResult = sut.Getsuppliers();

        //Assert
        //Assert.Equal(supplierDataMock,actualDataResult);
    }