Creating a System.Web.Caching.Cache object in a unit test

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青春惊慌失措
青春惊慌失措 2021-02-15 01:49

I\'m trying to implement a unit test for a function in a project that doesn\'t have unit tests and this function requires a System.Web.Caching.Cache object as a parameter. I\'ve

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  •  醉梦人生
    2021-02-15 02:04

    When I've been faced with this sort of problem (where the class in question doesn't implement an interface), I often end up writing a wrapper with associated interface around the class in question. Then I use my wrapper in my code. For unit tests, I hand mock the wrapper and insert my own mock object into it.

    Of course, if a mocking framework works, then use it instead. My experience is that all mocking frameworks have some issues with various .NET classes.

    public interface ICacheWrapper
    {
       ...methods to support
    }
    
    public class CacheWrapper : ICacheWrapper
    {
        private System.Web.Caching.Cache cache;
        public CacheWrapper( System.Web.Caching.Cache cache )
        {
            this.cache = cache;
        }
    
        ... implement methods using cache ...
    }
    
    public class MockCacheWrapper : ICacheWrapper
    {
        private MockCache cache;
        public MockCacheWrapper( MockCache cache )
        {
            this.cache = cache;
        }
    
        ... implement methods using mock cache...
    }
    
    public class MockCache
    {
         ... implement ways to set mock values and retrieve them...
    }
    
    [Test]
    public void CachingTest()
    {
        ... set up omitted...
    
        ICacheWrapper wrapper = new MockCacheWrapper( new MockCache() );
    
        CacheManager manager = new CacheManager( wrapper );
    
        manager.Insert(item,value);
    
        Assert.AreEqual( value, manager[item] );
    }
    

    Real code

    ...
    
    CacheManager manager = new CacheManager( new CacheWrapper( HttpContext.Current.Cache ));
    
    manager.Add(item,value);
    
    ...
    

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