Question

如何为

编写单元测试

public ActionResult Details()
{
    EmployeeDTO employee = this.EmployeeService.GetLoggedInEmployee();
    EmployeeModel model = assembler.ToEmployeeModel(employee);
    model.Title = GetEmployeeNameTitle(employee);
    model.Controller = "LoanProcessor";
    model.SelectedTab = MainNavTabs.LoanProcessor;
    return View(model);
}

我不知道如何解决它。

Answer 1

为了使您的代码可测试，您应该将依赖项注入控制器（如果您将依赖项传递给控制器，或者直接实例化它们，则从这段代码中不清楚）。此外，您应该让您的控制器依赖于抽象（最好是接口），而不是具体的实现。

EmployeeService应实现此接口：

public interface IEmployeeService
{
   EmployeeDTO GetLoggedInEmployee();
   // other methods of service
}

然后你根据抽象来制作你的控制器（这里只显示一个依赖关系样本）：

public class FooController : Controller
{
    private IEmployeeService _employeeService;

    public FooController(IEmployeeService employeeService)
    {
         _employeeService = employeeService;
    }   
}

现在您可以模拟依赖项并开始为控制器编写测试（使用NUnit和Moq的示例）：

[Test]
public void ShouldProvideEmployeeDetails()
{
    // Arrange
    EmployeeDTO bob = new EmployeDTO("Bob", 42);
    Mock<IEmployeeService> employeeService = new Mock<IEmployeeService>();
    employeeService.Setup(s = s.GetLoggedInEmployee()).Returns(bob);
    FooController controller = new FooController(employeeService.Object);
    // Act
    var result = controller.Details() as ViewResult;
    // Assert
    EmployeeModel model = result.ViewData.Model;
    Assert.That(model.Title, Is.EqualTo("Bob"));
    Assert.That(model.Controller, Is.EqualTo("LoanProcessor"));
}

然后编写代码以通过此测试。您可以阅读有关TDD here的更多信息。

控制器mvc3单元测试

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