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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Linq;
using Moq;
using Xunit;
using Assert = Microsoft.TestCommon.AssertEx;
namespace System.Web.Mvc.Test
{
public class MultiServiceResolverTest
{
[Fact]
public void ConstructorWithNullThunkArgumentThrows()
{
// Act & Assert
Assert.ThrowsArgumentNull(
delegate { new MultiServiceResolver<TestProvider>(null); },
"itemsThunk");
}
[Fact]
public void CurrentPrependsFromResolver()
{
// Arrange
IEnumerable<TestProvider> providersFromServiceLocation = GetProvidersFromService();
IEnumerable<TestProvider> providersFromItemsThunk = GetProvidersFromItemsThunk();
IEnumerable<TestProvider> expectedProviders = providersFromServiceLocation.Concat(providersFromItemsThunk);
Mock<IDependencyResolver> resolver = new Mock<IDependencyResolver>();
resolver.Setup(r => r.GetServices(typeof(TestProvider)))
.Returns(providersFromServiceLocation);
MultiServiceResolver<TestProvider> multiResolver = new MultiServiceResolver<TestProvider>(() => providersFromItemsThunk, resolver.Object);
// Act
IEnumerable<TestProvider> returnedProviders = multiResolver.Current;
// Assert
Assert.Equal(expectedProviders.ToList(), returnedProviders.ToList());
}
[Fact]
public void CurrentCachesResolverResult()
{
// Arrange
IEnumerable<TestProvider> providersFromServiceLocation = GetProvidersFromService();
IEnumerable<TestProvider> providersFromItemsThunk = GetProvidersFromItemsThunk();
IEnumerable<TestProvider> expectedProviders = providersFromServiceLocation.Concat(providersFromItemsThunk);
Mock<IDependencyResolver> resolver = new Mock<IDependencyResolver>();
resolver.Setup(r => r.GetServices(typeof(TestProvider)))
.Returns(providersFromServiceLocation);
MultiServiceResolver<TestProvider> multiResolver = new MultiServiceResolver<TestProvider>(() => providersFromItemsThunk, resolver.Object);
// Act
IEnumerable<TestProvider> returnedProviders = multiResolver.Current;
IEnumerable<TestProvider> cachedProviders = multiResolver.Current;
// Assert
Assert.Equal(expectedProviders.ToList(), returnedProviders.ToList());
Assert.Equal(expectedProviders.ToList(), cachedProviders.ToList());
resolver.Verify(r => r.GetServices(typeof(TestProvider)), Times.Exactly(1));
}
[Fact]
public void CurrentReturnsCurrentItemsWhenResolverReturnsNoInstances()
{
// Arrange
IEnumerable<TestProvider> providersFromItemsThunk = GetProvidersFromItemsThunk();
MultiServiceResolver<TestProvider> resolver = new MultiServiceResolver<TestProvider>(() => providersFromItemsThunk);
// Act
IEnumerable<TestProvider> returnedProviders = resolver.Current;
// Assert
Assert.Equal(providersFromItemsThunk.ToList(), returnedProviders.ToList());
}
[Fact]
public void CurrentDoesNotQueryResolverAfterNoInstancesAreReturned()
{
// Arrange
IEnumerable<TestProvider> providersFromItemsThunk = GetProvidersFromItemsThunk();
Mock<IDependencyResolver> resolver = new Mock<IDependencyResolver>();
resolver.Setup(r => r.GetServices(typeof(TestProvider)))
.Returns(new TestProvider[0]);
MultiServiceResolver<TestProvider> multiResolver = new MultiServiceResolver<TestProvider>(() => providersFromItemsThunk, resolver.Object);
// Act
IEnumerable<TestProvider> returnedProviders = multiResolver.Current;
IEnumerable<TestProvider> cachedProviders = multiResolver.Current;
// Assert
Assert.Equal(providersFromItemsThunk.ToList(), returnedProviders.ToList());
Assert.Equal(providersFromItemsThunk.ToList(), cachedProviders.ToList());
resolver.Verify(r => r.GetServices(typeof(TestProvider)), Times.Exactly(1));
}
[Fact]
public void CurrentPropagatesExceptionWhenResolverThrowsNonActivationException()
{
// Arrange
Mock<IDependencyResolver> resolver = new Mock<IDependencyResolver>(MockBehavior.Strict);
MultiServiceResolver<TestProvider> multiResolver = new MultiServiceResolver<TestProvider>(() => null, resolver.Object);
// Act & Assert
Assert.Throws<MockException>(
() => multiResolver.Current,
@"IDependencyResolver.GetServices(System.Web.Mvc.Test.MultiServiceResolverTest+TestProvider) invocation failed with mock behavior Strict.
All invocations on the mock must have a corresponding setup."
);
}
private class TestProvider
{
}
private IEnumerable<TestProvider> GetProvidersFromService()
{
return new TestProvider[]
{
new TestProvider(),
new TestProvider()
};
}
private IEnumerable<TestProvider> GetProvidersFromItemsThunk()
{
return new TestProvider[]
{
new TestProvider(),
new TestProvider()
};
}
}
}
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