NUnit模拟不适用于Singleton方法 [英] NUnit Mocking not working for Singleton Method
问题描述
与我同在,我是NUnit的新手.我来自Rails国,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.
我有一行看起来像这样的代码:
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(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);
调试测试时,getCodeByCodeNameAndType
返回null
,而不是预期的code
.我在做什么错了?
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)的类.
A DynamicMock creates a new object in-memory that represents the interface, or marshallable (inherits from MarshalByRef) class you want to mock.
尝试一下:
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继承自MarshalByRef.否则第三行将不起作用.
Note that the third line there will not work unless WebSiteConfiguration inherits from MarshalByRef.
您通常要做的是模拟一个接口,并获得一个实现该接口的新对象,但该对象的行为与您配置该接口的方式相同,而不必为此创建具体类型,因此我不是除非您采用更好的隔离框架(如TypeMock可以拦截对现有对象中静态方法/属性的调用),否则完全可以确定您的工作将正常进行.
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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