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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 Xunit;
public class TransientDependencyResolverTests : TestBase
{
[Fact]
public void Constructors_throw_for_null_instance()
{
Assert.Equal(
"activator",
Assert.Throws<ArgumentNullException>(() => new TransientDependencyResolver<object>(null)).ParamName);
Assert.Equal(
"activator",
Assert.Throws<ArgumentNullException>(() => new TransientDependencyResolver<object>(null, "Karl")).ParamName);
}
public interface IPilkington
{
}
public class Karl : IPilkington
{
}
public interface IGervais
{
}
[Fact]
public void GetService_returns_unnamed_instance_of_contract_interface()
{
Assert.NotNull(new TransientDependencyResolver<IPilkington>(() => new Karl()).GetService<IPilkington>());
}
[Fact]
public void GetService_returns_named_instance_of_contract_interface()
{
Assert.NotNull(new TransientDependencyResolver<IPilkington>(() => new Karl(), "Karl").GetService<IPilkington>("Karl"));
}
[Fact]
public void GetService_returns_null_when_contract_interface_does_not_match()
{
Assert.Null(new TransientDependencyResolver<IPilkington>(() => new Karl()).GetService<IGervais>());
Assert.Null(new TransientDependencyResolver<IPilkington>(() => new Karl(), null).GetService<IGervais>());
Assert.Null(new TransientDependencyResolver<IPilkington>(() => new Karl(), "Karl").GetService<IGervais>("Karl"));
}
[Fact]
public void GetService_returns_null_when_name_does_not_match()
{
Assert.Null(new TransientDependencyResolver<IPilkington>(() => new Karl(), "Karl").GetService<IPilkington>("Ricky"));
Assert.Null(new TransientDependencyResolver<IPilkington>(() => new Karl(), "Karl").GetService<IPilkington>());
Assert.Null(new TransientDependencyResolver<IPilkington>(() => new Karl(), "Karl").GetService<IGervais>("Ricky"));
}
/// <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 karl = new Karl();
var resolver = new TransientDependencyResolver<IPilkington>(() => karl, "Karl");
ExecuteInParallel(() => bag.Add(resolver.GetService<IPilkington>("Karl")));
Assert.Equal(20, bag.Count);
Assert.True(bag.All(c => karl == c));
}
}
}
}
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