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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 System.Runtime.Caching;
using Moq;
using Xunit;
using Assert = Microsoft.TestCommon.AssertEx;
namespace System.Web.Mvc.Test
{
public class CachedAssociatedMetadataProviderTest
{
[Fact]
public void GetMetadataForPropertyInvalidPropertyNameThrows()
{
// Arrange
MockableCachedAssociatedMetadataProvider provider = new MockableCachedAssociatedMetadataProvider();
// Act & Assert
Assert.Throws<ArgumentException>(
() => provider.GetMetadataForProperty(null, typeof(object), "BadPropertyName"),
"The property System.Object.BadPropertyName could not be found.");
}
[Fact]
public void GetCacheKey_ResultsForTypesDoNotCollide()
{
// Arrange
var provider = new MockableCachedAssociatedMetadataProvider();
var keys = new List<string>();
// Act
keys.Add(provider.GetCacheKey(typeof(string)));
keys.Add(provider.GetCacheKey(typeof(int)));
keys.Add(provider.GetCacheKey(typeof(Nullable<int>)));
keys.Add(provider.GetCacheKey(typeof(Nullable<bool>)));
keys.Add(provider.GetCacheKey(typeof(List<string>)));
keys.Add(provider.GetCacheKey(typeof(List<bool>)));
// Assert
Assert.Equal(keys.Distinct().Count(), keys.Count);
}
[Fact]
public void GetCacheKey_ResultsForTypesAndPropertiesDoNotCollide()
{
// Arrange
var provider = new MockableCachedAssociatedMetadataProvider();
var keys = new List<string>();
// Act
keys.Add(provider.GetCacheKey(typeof(string), "Foo"));
keys.Add(provider.GetCacheKey(typeof(string), "Bar"));
keys.Add(provider.GetCacheKey(typeof(int), "Foo"));
keys.Add(provider.GetCacheKey(typeof(Nullable<int>), "Foo"));
keys.Add(provider.GetCacheKey(typeof(Nullable<bool>), "Foo"));
keys.Add(provider.GetCacheKey(typeof(List<string>), "Count"));
keys.Add(provider.GetCacheKey(typeof(List<bool>), "Count"));
keys.Add(provider.GetCacheKey(typeof(Foo), "BarBaz"));
keys.Add(provider.GetCacheKey(typeof(FooBar), "Baz"));
// Assert
Assert.Equal(keys.Distinct().Count(), keys.Count);
}
private class Foo
{
}
private class FooBar
{
}
// GetMetadataForProperty
[Fact]
public void GetMetadataForPropertyCreatesPrototypeMetadataAndAddsItToCache()
{
// Arrange
var provider = new Mock<MockableCachedAssociatedMetadataProvider> { CallBase = true };
// Act
provider.Object.GetMetadataForProperty(() => 3, typeof(string), "Length");
// Assert
provider.Verify(p => p.CreateMetadataPrototypeImpl(It.IsAny<IEnumerable<Attribute>>(),
typeof(string) /* containerType */,
typeof(int) /* modelType */,
"Length" /* propertyName */));
provider.Object.Cache.Verify(c => c.Add(provider.Object.GetCacheKey(typeof(string), "Length"),
provider.Object.PrototypeMetadata,
provider.Object.CacheItemPolicy, null));
}
[Fact]
public void GetMetadataForPropertyCreatesRealMetadataFromPrototype()
{
// Arrange
Func<object> accessor = () => 3;
var provider = new Mock<MockableCachedAssociatedMetadataProvider> { CallBase = true };
// Act
provider.Object.GetMetadataForProperty(accessor, typeof(string), "Length");
// Assert
provider.Verify(p => p.CreateMetadataFromPrototypeImpl(provider.Object.PrototypeMetadata, accessor));
}
[Fact]
public void MetaDataAwareAttributesForPropertyAreAppliedToMetadata()
{
// Arrange
MemoryCache memoryCache = new MemoryCache("testCache");
MockableCachedAssociatedMetadataProvider provider = new MockableCachedAssociatedMetadataProvider(memoryCache);
// Act
ModelMetadata metadata = provider.GetMetadataForProperty(null, typeof(ClassWithMetaDataAwareAttributes), "PropertyWithAdditionalValue");
// Assert
Assert.True(metadata.AdditionalValues["baz"].Equals("biz"));
}
[Fact]
public void GetMetadataForPropertyTwiceOnlyCreatesAndCachesPrototypeOnce()
{
// Arrange
Func<object> accessor = () => 3;
var provider = new Mock<MockableCachedAssociatedMetadataProvider> { CallBase = true };
// Act
provider.Object.GetMetadataForProperty(accessor, typeof(string), "Length");
provider.Object.GetMetadataForProperty(accessor, typeof(string), "Length");
// Assert
provider.Verify(p => p.CreateMetadataPrototypeImpl(It.IsAny<IEnumerable<Attribute>>(),
typeof(string) /* containerType */,
typeof(int) /* modelType */,
"Length" /* propertyName */),
Times.Once());
provider.Verify(p => p.CreateMetadataFromPrototypeImpl(provider.Object.PrototypeMetadata, accessor),
Times.Exactly(2));
provider.Object.Cache.Verify(c => c.Add(provider.Object.GetCacheKey(typeof(string), "Length"),
provider.Object.PrototypeMetadata,
provider.Object.CacheItemPolicy, null),
Times.Once());
}
// GetMetadataForType
[Fact]
public void GetMetadataForTypeCreatesPrototypeMetadataAndAddsItToCache()
{
// Arrange
var provider = new Mock<MockableCachedAssociatedMetadataProvider> { CallBase = true };
// Act
provider.Object.GetMetadataForType(() => "foo", typeof(string));
// Assert
provider.Verify(p => p.CreateMetadataPrototypeImpl(It.IsAny<IEnumerable<Attribute>>(),
null /* containerType */,
typeof(string) /* modelType */,
null /* propertyName */));
provider.Object.Cache.Verify(c => c.Add(provider.Object.GetCacheKey(typeof(string), null),
provider.Object.PrototypeMetadata,
provider.Object.CacheItemPolicy, null));
}
[Fact]
public void GetMetadataForTypeCreatesRealMetadataFromPrototype()
{
// Arrange
Func<object> accessor = () => "foo";
var provider = new Mock<MockableCachedAssociatedMetadataProvider> { CallBase = true };
// Act
provider.Object.GetMetadataForType(accessor, typeof(string));
// Assert
provider.Verify(p => p.CreateMetadataFromPrototypeImpl(provider.Object.PrototypeMetadata, accessor));
}
[Fact]
public void MetaDataAwareAttributesForTypeAreAppliedToMetadata()
{
// Arrange
MemoryCache memoryCache = new MemoryCache("testCache");
MockableCachedAssociatedMetadataProvider provider = new MockableCachedAssociatedMetadataProvider(memoryCache);
// Act
ModelMetadata metadata = provider.GetMetadataForType(null, typeof(ClassWithMetaDataAwareAttributes));
// Assert
Assert.True(metadata.AdditionalValues["foo"].Equals("bar"));
}
[Fact]
public void GetMetadataForTypeTwiceOnlyCreatesAndCachesPrototypeOnce()
{
// Arrange
Func<object> accessor = () => "foo";
var provider = new Mock<MockableCachedAssociatedMetadataProvider> { CallBase = true };
// Act
provider.Object.GetMetadataForType(accessor, typeof(string));
provider.Object.GetMetadataForType(accessor, typeof(string));
// Assert
provider.Verify(p => p.CreateMetadataPrototypeImpl(It.IsAny<IEnumerable<Attribute>>(),
null /* containerType */,
typeof(string) /* modelType */,
null /* propertyName */),
Times.Once());
provider.Verify(p => p.CreateMetadataFromPrototypeImpl(provider.Object.PrototypeMetadata, accessor),
Times.Exactly(2));
provider.Object.Cache.Verify(c => c.Add(provider.Object.GetCacheKey(typeof(string), null),
provider.Object.PrototypeMetadata,
provider.Object.CacheItemPolicy, null),
Times.Once());
}
// Helpers
public class MockableCachedAssociatedMetadataProvider : CachedAssociatedMetadataProvider<ModelMetadata>
{
public Mock<MemoryCache> Cache;
public ModelMetadata PrototypeMetadata;
public ModelMetadata RealMetadata;
public MockableCachedAssociatedMetadataProvider()
: this(null)
{
}
public MockableCachedAssociatedMetadataProvider(MemoryCache memoryCache = null)
{
Cache = new Mock<MemoryCache>("MockMemoryCache", null) { CallBase = true };
PrototypeMetadata = new ModelMetadata(this, null, null, typeof(string), null);
RealMetadata = new ModelMetadata(this, null, null, typeof(string), null);
PrototypeCache = memoryCache ?? Cache.Object;
}
public virtual ModelMetadata CreateMetadataPrototypeImpl(IEnumerable<Attribute> attributes, Type containerType, Type modelType, string propertyName)
{
return PrototypeMetadata;
}
public virtual ModelMetadata CreateMetadataFromPrototypeImpl(ModelMetadata prototype, Func<object> modelAccessor)
{
return RealMetadata;
}
protected override ModelMetadata CreateMetadataPrototype(IEnumerable<Attribute> attributes, Type containerType, Type modelType, string propertyName)
{
return CreateMetadataPrototypeImpl(attributes, containerType, modelType, propertyName);
}
protected override ModelMetadata CreateMetadataFromPrototype(ModelMetadata prototype, Func<object> modelAccessor)
{
return CreateMetadataFromPrototypeImpl(prototype, modelAccessor);
}
}
[AdditionalMetadata("foo", "bar")]
private class ClassWithMetaDataAwareAttributes
{
[AdditionalMetadata("baz", "biz")]
public string PropertyWithAdditionalValue { get; set; }
}
}
}
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