Question

我正在努力测试以下方法：

public JsonResult GetJsonObjectsFromOffices(int siteId)
{
    IEnumerable<Office> officeList; 

    officeList = repository.Offices
        .Where(o => o.SiteID == siteId)
        .OrderBy(o => o.Name);

    return Json(new SelectList(officeList, "OfficeID", "Name"));
}

使用Moq和xUnit，我有以下测试

//Arrange
Mock<IFormRepository> mockRepo = new Mock<IFormRepository>();
var mockUserMgr = GetMockUserManager();
var userValid = new CustomUserValidator();
var passwordValid = new CustomPasswordValidator();
var passwordHash = new PasswordHasher<AppUser>();
mockRepo.Setup(m => m.Offices).Returns(new Office[]
{
    new Office {OfficeID = 2, SiteID = 2, Name = "Bravo"},
    new Office {OfficeID = 1, SiteID = 1, Name = "Alpha"},
    new Office {OfficeID = 3, SiteID = 1, Name = "Charlie"}
}.AsQueryable<Office>());

AdminController controller = new AdminController(mockUserMgr.Object, userValid, passwordValid, passwordHash, mockRepo.Object);

//Act
var jsonObj = controller.GetJsonObjectsFromOffices(1);

//'Unexpected character encountered while parsing value: M. Path '', line 0, position 0.' error on line below
//var selectList = JsonConvert.DeserializeObject(jsonObj.Value.ToString());

测试的Assert部分的目标是验证是否返回了正确数量的列表项（即两个项目对应SiteID = 1）。

jsonObj是JsonResult类型，其值为{Microsoft.Mvc.Rendering.SelectList}。在SelectList内，生成了正确的Items，但我不知道如何访问它们来计算

Answer 1

结果中存储的值将是传递给它的类型。

将期望值转换为期望的类型，并在成功转换时对其执行断言

//...code removed for brevity

//Act
var jsonResult = controller.GetJsonObjectsFromOffices(1);

//Assert
var selectList = jsonResult.Value as SelectList;
Assert.NotNull(selectList); //<-- cast was successful

var expected = 2;
var actual = selectList.Count();

Assert.Equal(expected, actual);

单元测试返回为JsonResult

1 个答案: