我的问题是这样的，我在Roleservice中有一个名为GetListAsync（）的方法，这个方法返回一个角色列表，为了举例，假设我有这样一段代码
变量角色= await _roleManager.Roles.ToListAsync（）;返回角色;
如何提交Roles属性以进行模拟。
如果你能帮忙我会很高兴

public class RoleService : IRoleService
{
    private readonly RoleManager<Role> _roleManager;
    private readonly IMapper _mapper;

    public RoleService(RoleManager<Role> roleManager, IMapper mapper = null)
    {
        _roleManager = roleManager;
        _mapper = mapper;
    }
    public async Task<List<RoleDto>> GetListAsync()
    {

        var roles = await _roleManager.Roles.ToListAsync();

        if (roles == null)
            throw new NotFoundException(ResponseCode.Exception, ErrorMessageKey.ROLE_NOTFOUND);

        return _mapper.Map<List<RoleDto>>(roles);
    }
 }

测试代码

public class RoleServiceTest
{
    private Mock<RoleManager<Role>> _mockRoleManager;
    private RoleManager<Role> _roleManager;
    private RoleService _roleService;
    private IMapper _mapper;

    private readonly List<Role> _roles;

    public RoleServiceTest()
    {
        var myProfile = new MappingProfile();
        var configuration = new MapperConfiguration(cfg => cfg.AddProfile(myProfile));
        _mapper = new Mapper(configuration);
        _mockRoleManager = GetRoleManagerMock();
        _roleManager = _mockRoleManager.Object;
        _roleService = new RoleService(_roleManager, _mapper);

        _roles = GetFakerRoles();
    }

  

    [Fact]
    public async Task GetListAsync_ValidInput_RoleDto()
    {
        // mocking code 

        var result = await _roleService.GetListAsync();

        Assert.NotNull(result);
        Assert.IsType<List<RoleDto>>(result);
    }

   

    private Mock<RoleManager<Role>> GetRoleManagerMock()
    {
        

        return new Mock<RoleManager<Role>>(
            new Mock<IRoleStore<Role>>().Object,
            new IRoleValidator<Role>[0],
            new Mock<ILookupNormalizer>().Object,
            new Mock<IdentityErrorDescriber>().Object,
            new Mock<ILogger<RoleManager<Role>>>().Object);
    }

    private List<Role> GetFakerRoles()
    {
        return new Faker<Role>()
             .RuleFor(r => r.Id, f => f.Random.Guid().ToString())
             .RuleFor(r => r.Name, f => f.Random.Words())
             .RuleFor(r => r.NormalizedName, (f, r) => r.Name.ToUpper())
             .RuleFor(r => r.ConcurrencyStamp, f => f.Random.ToString())
             .Generate(4);
    }
}