使用 HtmlHelper 进行 DisplayFormat 单元测试

Question

MyModel _model = new MyModel() { PriceDate = new DateTime(2000, 1, 1)};

var helper = new System.Web.Mvc.HtmlHelper<MyModel>(new ViewContext(), new ViewPage());
var result = helper.DisplayFor(m => _model.PriceDate);

Assert.That(result, Is.EqualTo(expected));

我想测试调用DisplayFor生成的 output 是否为...指定的格式

[DisplayFormat(DataFormatString = "{0:dd/MM/yy}")]
public DateTime? PriceDate { get; set; }

代码编译但在DisplayFor出现NullReferenceException失败。

谁能帮我完成这项工作？

（注意：这是一个更大问题的简单示例）

Answer 1

步骤比较长，这里就不写了。 我在我的博客上写过它：D

http://thoai-nguyen.blogspot.com/2011/07/unit-test-displayformat-attribute.html

干杯

Answer 2

我使用以下代码来测试和验证 html 助手。

验证是另一个例子。

尝试以下操作：

    var sb = new StringBuilder();
    var context = new ViewContext();
    context.ViewData = new ViewDataDictionary(_testModel);
    context.Writer = new StringWriter(sb);
    var page = new ViewPage<TestModel>();
    var helper = new HtmlHelper<TestModel>(context, page);

    //Do your stuff here to exercise your helper

    //Following example contains two helpers that are being tested
    //A MyCustomBeginForm Helper and a OtherCoolHelperIMade Helper
    using(helper.MyCustomBeginForm("secretSauce"))
    {
       helper.ViewContext.Writer.WriteLine(helper.OtherCoolHelperIMade("bigMacSauce"));
    }
    //End Example

    //Get the results of all helpers
    var result = sb.ToString();

    //Asserts and string tests here for emitted HTML
    Assert.IsNotNullOrEmpty(result);