Mock Lambda Parameterless Expression

Question

Getting my head all banged up trying to moq the interface below. The GetOrSet has me tripped up. The service comes from here

public interface ICacheService
{
    T GetOrSet<T>(string cackeKey, int expiryInMinutes, Func<T> getItemCallback) where T : class;
}

public class CacheService : ICacheService
{
    public T GetOrSet<T>(string cacheKey, int expiryInMinutes, Func<T> getItemCallback) where T : class
    {

        T item = MemoryCache.Default.Get(cacheKey) as T;
        if (item == null)
        {
            item = getItemCallback();
            MemoryCache.Default.Add(cacheKey, item, DateTime.Now.AddMinutes(expiryInMinutes));
        }
        return item;
    }
}

Example in code:

var result = _cacheService.GetOrSet(
        cacheKey,
        cacheExpiry,
      () => this.GetRoutes(routeType));
return result.Select(x => new Route(x));

To do what? You can easily set it up with eg `mock.Setup(m => m.GetOrSet("key", 1, () => new TestClass()));` — stuartd, May 11 '16 at 14:11

score 1 · Answer 1 · answered May 11 '16 at 14:08

1

Basic setup could look like:

public static ICacheService GetMockCacheService<T>() where T : class
{
     var mock = new Mock<ICacheService>();

     mock.Setup(service => service.GetOrSet(It.IsAny<string>(), It.IsAny<int>(), It.IsAny<Func<T>>()))
         .Returns(default(T));

     return mock.Object;
}

Use a generic method to build your mock for whatever type you need in the implementation.

answered May 11 '16 at 14:08

Jonesopolis

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Thanks. Seeing your example really helped. – gnome May 11 '16 at 15:16

Mock Lambda Parameterless Expression

1 Answers1