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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
namespace System.Data.Entity.Config
{
using System.Collections.Concurrent;
using System.Linq;
using Moq;
using Xunit;
public class CompositeResolverTests : TestBase
{
[Fact]
public void Get_returns_result_of_first_resolver_if_result_is_non_null()
{
var mockFirstResolver = new Mock<IDbDependencyResolver>();
var mockSecondResolver = new Mock<IDbDependencyResolver>();
var karl = new Mock<IPilkington>().Object;
mockFirstResolver.Setup(m => m.GetService(typeof(IPilkington), "Karl")).Returns(karl);
Assert.Same(
karl,
new CompositeResolver<IDbDependencyResolver, IDbDependencyResolver>(
mockFirstResolver.Object, mockSecondResolver.Object).GetService<IPilkington>("Karl"));
mockFirstResolver.Verify(m => m.GetService(typeof(IPilkington), "Karl"), Times.Once());
mockSecondResolver.Verify(m => m.GetService(It.IsAny<Type>(), It.IsAny<string>()), Times.Never());
}
[Fact]
public void Get_returns_result_of_second_resolver_if_result_of_first_is_null()
{
var mockFirstResolver = new Mock<IDbDependencyResolver>();
var mockSecondResolver = new Mock<IDbDependencyResolver>();
var karl = new Mock<IPilkington>().Object;
mockSecondResolver.Setup(m => m.GetService(typeof(IPilkington), "Karl")).Returns(karl);
Assert.Same(
karl,
new CompositeResolver<IDbDependencyResolver, IDbDependencyResolver>(
mockFirstResolver.Object, mockSecondResolver.Object).GetService<IPilkington>("Karl"));
mockFirstResolver.Verify(m => m.GetService(typeof(IPilkington), "Karl"), Times.Once());
mockSecondResolver.Verify(m => m.GetService(typeof(IPilkington), "Karl"), Times.Once());
}
[Fact]
public void Get_returns_null_if_both_resolvers_return_null()
{
var mockFirstResolver = new Mock<IDbDependencyResolver>();
var mockSecondResolver = new Mock<IDbDependencyResolver>();
Assert.Null(
new CompositeResolver<IDbDependencyResolver, IDbDependencyResolver>(
mockFirstResolver.Object, mockSecondResolver.Object).GetService<IPilkington>("Karl"));
mockFirstResolver.Verify(m => m.GetService(typeof(IPilkington), "Karl"), Times.Once());
mockSecondResolver.Verify(m => m.GetService(typeof(IPilkington), "Karl"), Times.Once());
}
public interface IPilkington
{
}
/// <summary>
/// This test makes calls from multiple threads such that we have at least some chance of finding threading
/// issues. As with any test of this type just because the test passes does not mean that the code is
/// correct. On the other hand if this test ever fails (EVEN ONCE) then we know there is a problem to
/// be investigated. DON'T just re-run and think things are okay if the test then passes.
/// </summary>
[Fact]
public void GetService_can_be_accessed_from_multiple_threads_concurrently()
{
for (var i = 0; i < 30; i++)
{
var bag = new ConcurrentBag<IPilkington>();
var karl1 = new Mock<IPilkington>().Object;
var resolver = new CompositeResolver<IDbDependencyResolver, IDbDependencyResolver>(
new SingletonDependencyResolver<IPilkington>(karl1),
new SingletonDependencyResolver<IPilkington>(new Mock<IPilkington>().Object));
ExecuteInParallel(() => bag.Add(resolver.GetService<IPilkington>()));
Assert.Equal(20, bag.Count);
Assert.True(bag.All(c => karl1 == c));
}
}
}
}
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