如何使用 Moq 框架模拟 ModelState.IsValid?

问题描述

我正在我的控制器操作方法中检查 ModelState.IsValid，该方法会创建这样的 Employee:

I'm checking ModelState.IsValid in my controller action method that creates an Employee like this:

[HttpPost]
public virtual ActionResult Create(EmployeeForm employeeForm)
{
    if (this.ModelState.IsValid)
    {
        IEmployee employee = this._uiFactoryInstance.Map(employeeForm);
        employee.Save();
    }

    // Etc.
}

我想在我的单元测试方法中使用 Moq 框架来模拟它.我试着像这样模拟它:

I want to mock it in my unit test method using Moq Framework. I tried to mock it like this:

var modelState = new Mock<ModelStateDictionary>();
modelState.Setup(m => m.IsValid).Returns(true);

但这会在我的单元测试用例中引发异常.有谁能帮帮我吗?

But this throws an exception in my unit test case. Can anyone help me out here?

推荐答案

你不需要模拟它.如果您已经有控制器，则可以在初始化测试时添加模型状态错误:

You don't need to mock it. If you already have a controller you can add a model state error when initializing your test:

// arrange
_controllerUnderTest.ModelState.AddModelError("key", "error message");

// act
// Now call the controller action and it will 
// enter the (!ModelState.IsValid) condition
var actual = _controllerUnderTest.Index();

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