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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.Data.Entity.Core.Common;
using System.Data.Entity.Resources;
using System.Data.Entity.SqlServer;
using System.Data.Entity.SqlServerCompact;
using System.Linq;
using Xunit;
public class DefaultProviderServicesResolverTests : TestBase
{
[Fact]
public void The_provider_services_resolver_returns_SqlProviderServices_type_for_SqlClient_invariant_name()
{
Assert.Same(
SqlProviderServices.Instance,
new DefaultProviderServicesResolver().GetService<DbProviderServices>("System.Data.SqlClient"));
}
[Fact]
public void The_provider_services_resolver_returns_SqlCeProviderServices_type_for_Sql_Compact_invariant_name()
{
Assert.Same(
SqlCeProviderServices.Instance,
new DefaultProviderServicesResolver().GetService<DbProviderServices>("System.Data.SqlServerCe.4.0"));
}
[Fact]
public void The_provider_services_resolver_throws_for_an_unknown_provider_name()
{
Assert.Equal(
Strings.EF6Providers_NoProviderFound("Don't.Come.Around.Here.No.More"),
Assert.Throws<InvalidOperationException>(
() => new DefaultProviderServicesResolver().GetService<DbProviderServices>("Don't.Come.Around.Here.No.More")).Message);
}
[Fact]
public void The_provider_services_resolver_throws_for_an_empty_provider_name()
{
Assert.Equal(
Strings.ProviderInvariantNotPassedToResolver,
Assert.Throws<ArgumentException>(
() => new DefaultProviderServicesResolver().GetService<DbProviderServices>(null)).Message);
Assert.Equal(
Strings.ProviderInvariantNotPassedToResolver,
Assert.Throws<ArgumentException>(
() => new DefaultProviderServicesResolver().GetService<DbProviderServices>("")).Message);
Assert.Equal(
Strings.ProviderInvariantNotPassedToResolver,
Assert.Throws<ArgumentException>(
() => new DefaultProviderServicesResolver().GetService<DbProviderServices>(" ")).Message);
}
/// <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<DbProviderServices>();
var resolver = new DefaultProviderServicesResolver();
ExecuteInParallel(() => bag.Add(resolver.GetService<DbProviderServices>("System.Data.SqlClient")));
Assert.Equal(20, bag.Count);
Assert.True(bag.All(c => SqlProviderServices.Instance == c));
}
}
}
}
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