如何使用具有接口依赖的Nunit编写测试用例

Question

public List<CustomerViewModel> GetResellerCustomersWithProperties(string shortCode)
        {            
            var businessManager = DependencyContainer.GetInstance<ICortexBusinessManager>();
            return businessManager.GetResellerCustomersWithProperties(shortCode); 
        }

我们如何使用具有依赖性的Nunit编写测试用例。

Answer 1

依赖注入是您的朋友。
请注意，您需要一个IOC容器，例如AUTOFAC，UNITY，结构图等...与您的应用程序有线。

将您的依赖项注入类的构造函数：

public class CustomerService 
{
    private ICortexBusinessManager _cortexBusinessManager;
    public CustomerService (ICortexBusinessManager cortexBusinessManager)
    {
        _cortexBusinessManager = cortexBusinessManager;
    }
    public List<CustomerViewModel> GetResellerCustomersWithProperties(string shortCode)
    {            
        return _cortexBusinessManager.GetResellerCustomersWithProperties(shortCode); 
    }
}

然后，您可以在单元测试中使用模拟框架来模拟接口。

下面的示例使用MOQ

public class CustomerServiceTest
{
    [Test]
    public void GetResellerCustomersWithProperties_ReturnsFromCortextBusinessManager()
    {
        //arrange
        var mockCortexBusinessManager = new Mock<ICortexBusinessManager>();
        //if GetResellerCustomersWithProperties is called with s123, return a new list of CustomerViewModel
        //with one item in, with id of 1
        mockCortexBusinessManager.Setup(m=> m.GetResellerCustomersWithProperties("s123"))
            .Returns(new List<CustomerViewModel>(){new CustomerViewModel{Id = 1}});

        var customerService = new CustomerService(mockCortexBusinessManager.Object);
        //act
        var result = customerService.GetResellerCustomersWithProperties("s123");
        //assert
        Assert.AreEqual(1, result.Count())
        Assert.AreEqual(1, result.FirstOrDefault().Id)
    }
}