c# - 在对依赖于它的标记扩展进行单元测试时,如何设置 StaticResourceExtension?
问题描述
我写了一个自定义标记扩展:CoalesceResourceExtension
[MarkupExtensionReturnType(typeof(object))]
public class CoalesceResourceExtension : MarkupExtension
{
public CoalesceResourceExtension(string resources)
{
this.Resources = resources;
}
public string Separator { get; set; }
[ConstructorArgument("resources")]
public string Resources { get; set; }
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (Resources != null)
{
foreach (string resourceName in Resources.Split(new[] { Separator }, StringSplitOptions.RemoveEmptyEntries))
{
try
{
if (new StaticResourceExtension(resourceName).ProvideValue(serviceProvider) is object resource)
{
return resource;
}
}
catch { }
}
}
return null;
}
}
但是当我进行单元测试时CoalesceResourceExtension
,我似乎找不到一种方法来设置它,StaticResourceExtension
以便它可以找到所需的模拟资源。有没有办法可以设置东西StaticResourceExtension
来找到我的模拟资源?
解决方案
StaticResourceExtension.ProvideValue(IServiceProvider)
的行为可以通过模拟IServiceProvider
传递CoalesceResourceExtension
给的来控制,StaticResourceExtension
但您还需要模拟它使用的服务中的所有服务和对象:IAmbientProvider
, IXamlSchemaContextProvider
, XamlSchemaContext
, ResourceDictionary
,XamlType
和. 我通过使模拟严格并观察他们在遇到未设置的成员时抛出的异常以及查看源代码来观察所采用的路径来构建这些模拟。PropertyInfo
XamlMember
StaticResourceExtension
StaticResourceExtension
IServiceProvider
这是一个为传入的每个所需键 + 值对构建整个模拟的方法:
private IServiceProvider MockIServiceProviderForStaticResourceExtension(params KeyValuePair<object, object>[] resources)
{
Mock<IServiceProvider> serviceProviderMock = new Mock<IServiceProvider>(MockBehavior.Strict);
Mock<IXamlSchemaContextProvider> xamlSchemaContextProviderMock = new Mock<IXamlSchemaContextProvider>(MockBehavior.Strict);
Mock<IAmbientProvider> ambientProviderMock = new Mock<IAmbientProvider>(MockBehavior.Strict);
Mock<XamlSchemaContext> xamlSchemaContextMock = new Mock<XamlSchemaContext>(MockBehavior.Strict);
xamlSchemaContextMock.Setup(xsc => xsc.GetXamlType(It.IsAny<Type>())).Returns((Func<Type, XamlType>)(t => GetXamlTypeForType(t, xamlSchemaContextMock.Object)));
ambientProviderMock.Setup(ap => ap.GetAllAmbientValues(null, false, It.IsAny<IEnumerable<XamlType>>(), It.IsAny<XamlMember[]>())).Returns((Func<IEnumerable<XamlType>, bool, IEnumerable<XamlType>, XamlMember[], IEnumerable<AmbientPropertyValue>>)GetAllAmbientValuesImplementation);
xamlSchemaContextProviderMock.Setup(xscp => xscp.SchemaContext).Returns(xamlSchemaContextMock.Object);
serviceProviderMock.Setup(s => s.GetService(typeof(IXamlSchemaContextProvider))).Returns(xamlSchemaContextProviderMock.Object);
serviceProviderMock.Setup(s => s.GetService(typeof(IAmbientProvider))).Returns(ambientProviderMock.Object);
serviceProviderMock.Setup(s => s.GetService(It.IsNotIn(typeof(IXamlSchemaContextProvider), typeof(IAmbientProvider)))).Returns(null);
return serviceProviderMock.Object;
IEnumerable<AmbientPropertyValue> GetAllAmbientValuesImplementation(IEnumerable<XamlType> ceilingTypes, bool searchLiveStackOnly, IEnumerable<XamlType> types, params XamlMember[] properties)
{
Mock<ResourceDictionary> resourceDictionaryMock = new Mock<ResourceDictionary>(MockBehavior.Strict);
resourceDictionaryMock.Protected().Setup("OnGettingValue", false, ItExpr.Is<object>(o => resources.Any(kvp => kvp.Key.Equals(o))), ItExpr.Ref<object>.IsAny, ItExpr.Ref<bool>.IsAny).CallBase();
foreach (KeyValuePair<object, object> kvp in resources)
{
resourceDictionaryMock.Object.Add(kvp.Key, kvp.Value);
}
Mock<AmbientPropertyValue> ambientPropertyValueMock = new Mock<AmbientPropertyValue>(MockBehavior.Strict, null, resourceDictionaryMock.Object);
return new List<AmbientPropertyValue> { ambientPropertyValueMock.Object };
}
XamlType GetXamlTypeForType(Type t, XamlSchemaContext xamlSchemaContext)
{
Mock<XamlType> xamlTypeMock = new Mock<XamlType>(MockBehavior.Strict, t, xamlSchemaContext);
xamlTypeMock.Protected().Setup<XamlMember>("LookupMember", true, "Resources", false).Returns((Func<string, bool, XamlMember>)LookupMemberImplementation);
xamlTypeMock.Protected().Setup<XamlMember>("LookupMember", true, "BasedOn", false).Returns((Func<string, bool, XamlMember>)LookupMemberImplementation);
xamlTypeMock.Setup(xt => xt.ToString()).CallBase();
return xamlTypeMock.Object;
XamlMember LookupMemberImplementation(string name, bool skipReadOnlyCheck)
{
Mock<PropertyInfo> propertyInfoMock = new Mock<PropertyInfo>(MockBehavior.Strict);
propertyInfoMock.Setup(pi => pi.Name).Returns(name);
propertyInfoMock.Setup(pi => pi.DeclaringType).Returns(t);
Mock<XamlMember> xamlMemberMock = new Mock<XamlMember>(MockBehavior.Strict, propertyInfoMock.Object, xamlSchemaContext);
xamlMemberMock.Setup(xm => xm.ToString()).CallBase();
return xamlMemberMock.Object;
}
}
}
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