如何使用具有接口依赖性的 NUnit 编写测试用例？

Question

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

我们如何使用依赖于接口的 Nunit 编写测试用例。

Answer 1

依赖注入在这里是你的朋友。
注意您将需要一个 IOC 容器，例如 Autofac、Unity、StructureMap 等...与您的应用程序连接。

在类的构造函数中注入依赖项：

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对接口的调用。

下面的示例使用最小起订量

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)
    }
}