public void GetService_caches_the_result_from_the_underlying_resolver_for_a_given_type_name_pair()
{
var mockResolver = new Mock <IDbDependencyResolver>();
var cachingResolver = new CachingDependencyResolver(mockResolver.Object);
VerifyServiceIsCached(new Mock <IPilkington>().Object, cachingResolver, mockResolver, "Foo");
VerifyServiceIsCached(new Mock <IPilkington>().Object, cachingResolver, mockResolver, "Bar");
VerifyServiceIsCached(new Mock <IPilkington>().Object, cachingResolver, mockResolver, null);
VerifyServiceIsCached(new Mock <IGervais>().Object, cachingResolver, mockResolver, "Foo");
VerifyServiceIsCached(new Mock <IGervais>().Object, cachingResolver, mockResolver, "Bar");
VerifyServiceIsCached(new Mock <IGervais>().Object, cachingResolver, mockResolver, null);
}
private static void VerifyServiceIsCached <T>(
T service,
CachingDependencyResolver cachingResolver,
Mock <IDbDependencyResolver> mockResolver,
string name)
{
mockResolver.Setup(m => m.GetService(typeof(T), name)).Returns(service);
Assert.Same(service, cachingResolver.GetService <T>(name));
mockResolver.Verify(m => m.GetService(typeof(T), name), Times.Once());
Assert.Same(service, cachingResolver.GetService <T>(name));
mockResolver.Verify(m => m.GetService(typeof(T), name), Times.Once()); // Underlying resolver not called again
}
public void A_service_that_resolves_to_null_is_still_cached()
{
var mockResolver = new Mock <IDbDependencyResolver>();
mockResolver.Setup(m => m.GetServices(typeof(IPilkington), null)).Returns(Enumerable.Empty <object>());
var cachingResolver = new CachingDependencyResolver(mockResolver.Object);
Assert.Empty(cachingResolver.GetServices <IPilkington>());
mockResolver.Verify(m => m.GetServices(typeof(IPilkington), null), Times.Once());
Assert.Empty(cachingResolver.GetServices <IPilkington>());
mockResolver.Verify(m => m.GetServices(typeof(IPilkington), null), Times.Once()); // Underlying resolver not called again
}
public void GetService_can_be_accessed_from_multiple_threads_concurrently()
{
for (var i = 0; i < 30; i++)
{
var bag = new ConcurrentBag <IPilkington>();
var karl = new Mock <IPilkington>().Object;
var resolver = new CachingDependencyResolver(new SingletonDependencyResolver <IPilkington>(karl));
ExecuteInParallel(() => bag.Add(resolver.GetService <IPilkington>()));
Assert.Equal(20, bag.Count);
Assert.True(bag.All(c => karl == c));
}
}
