NUnit 模拟不适用于单例方法 [英] NUnit Mocking not working for Singleton Method

问题描述

请耐心等待，我是 NUnit 的新手.我来自 Rails 的土地，所以其中一些对我来说是新的.

Bear with me, I'm new to NUnit. I come from the land of Rails, so some of this is new to me.

我有一行代码如下所示:

I have a line of code that looks like this:

var code = WebSiteConfiguration.Instance.getCodeByCodeNameAndType("CATALOG_Brands_MinQty", item.Catalog);

我正在尝试模拟它，就像这样(假设 code 已经初始化):

I'm trying to mock it, like this (assume code is already initialized):

var _websiteConfigurationMock = new DynamicMock(typeof(WebSiteConfiguration));
_websiteConfigurationMock.ExpectAndReturn("getCodeByCodeNameAndType", code);

当我调试测试时，getCodeByCodeNameAndType 返回 null，而不是预期的 code.我做错了什么?

When I debug the test, getCodeByCodeNameAndType is returning null, instead of the expected code. What am I doing wrong?

NUnit 版本:2.2.8

NUnit version: 2.2.8

推荐答案

DynamicMock 在内存中创建一个新对象，该对象表示您要模拟的接口或可编组(从 MarshalByRef 继承)类.

A DynamicMock creates a new object in-memory that represents the interface, or marshallable (inherits from MarshalByRef) class you want to mock.

试试这个:

var _websiteConfigurationMock = new DynamicMock(typeof(WebSiteConfiguration));
_websiteConfigurationMock.ExpectAndReturn("getCodeByCodeNameAndType", code);
WebSiteConfiguration conf = (WebSiteConfiguration)_websiteConfigurationMock.MockInstance;
var x = conf.getCodeByCodeNameAndType("CATALOG_Brands_MinQty", item.Catalog);

请注意，除非 WebSiteConfiguration 从 MarshalByRef 继承，否则第三行将不起作用.

Note that the third line there will not work unless WebSiteConfiguration inherits from MarshalByRef.

您通常做的是模拟一个接口并获取一个实现该接口的新对象，但其行为方式与您配置它的方式相同，而不必为它创建具体类型，所以我不是除非您使用更好的隔离框架，例如可以拦截对现有对象中静态方法/属性的调用的 TypeMock，否则完全确定您正在做的事情会奏效.

What you typically do is mock an interface and get a new object that implements this interface, but behaves the way you've configured it to do, without having to go and make a concrete type for it, so I'm not entirely sure what you're doing is going to work unless you employ a better isolation framework, like TypeMock that can intercept calls to static methods/properties in existing objects.

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