Issue when running a test project targetting a Web API.

[AbhitejJohn]

From @mailbala

The WebAPi project targets net462 and Output type is exe . In the unit test project, I am using NSubstitute to mock the dependencies. When I run the test, I am getting the below error

Message: Initialization method WebApi.UnitTest.Controllers.HomeControllerV1Test.TestInitializer threw exception. System.IO.FileLoadException: Could not load file or assembly 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040).

When I use Moq, getting the below error.

Message: Test method WebApi.UnitTest.Controllers.HomeControllerV1Test.TestUserList threw exception:
System.BadImageFormatException: Could not load file or assembly 'CustomerInsights.WebApi, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. An attempt was made to load a program with an incorrect format.

[AbhitejJohn]

@mailbala: Can you share with us a repro project please?

[skynetit]

@AbhitejJohn I figured out the issue. I have a class library dependency for the webapi proj which was targeting netstandard1.5. When I changed to netstandard1.4, tests are running successfully.

Thanks!

[AbhitejJohn]

@mailbala : That seems more of a workaround to me. From here net461/net462 should be compatible with netstandard1.5. What is your unit test project targeting?

[skynetit]

@AbhitejJohn unit test project is targeting net462.
I am using SDK 1.0.4. netstandard1.4 works perfectly.

Message: Initialization method
WebApi.UnitTest.Controllers.HomeControllerV1Test.TestInitializer threw exception. System.IO.FileLoadException: Could not load file or assembly 'System.Runtime, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040).

StackTrace:
at System.Signature.GetSignature(Void* pCorSig, Int32 cCorSig, RuntimeFieldHandleInternal fieldHandle, IRuntimeMethodInfo methodHandle, RuntimeType declaringType)
at System.Reflection.RuntimeMethodInfo.FetchNonReturnParameters()
at System.Reflection.RuntimeMethodInfo.GetParameters()
at Castle.DynamicProxy.Generators.MethodSignatureComparer.GetHashCode(MethodInfo obj)
at System.Collections.Generic.Dictionary2.FindEntry(TKey key) at Castle.DynamicProxy.Generators.MethodFinder.RemoveDuplicates(MethodInfo[] infos) at Castle.DynamicProxy.Generators.MethodFinder.GetAllInstanceMethods(Type type, BindingFlags flags) at Castle.DynamicProxy.Contributors.MembersCollector.CollectMethods(IProxyGenerationHook hook) at Castle.DynamicProxy.Contributors.MembersCollector.CollectMembersToProxy(IProxyGenerationHook hook) at Castle.DynamicProxy.Contributors.InterfaceProxyWithoutTargetContributor.<CollectElementsToProxyInternal>d__0.MoveNext() at Castle.DynamicProxy.Contributors.CompositeTypeContributor.CollectElementsToProxy(IProxyGenerationHook hook, MetaType model) at Castle.DynamicProxy.Generators.InterfaceProxyWithoutTargetGenerator.GenerateType(String typeName, Type proxyTargetType, Type[] interfaces, INamingScope namingScope) at Castle.DynamicProxy.Generators.InterfaceProxyWithTargetGenerator.<>c__DisplayClass1.<GenerateCode>b__0(String n, INamingScope s) at Castle.DynamicProxy.Generators.BaseProxyGenerator.ObtainProxyType(CacheKey cacheKey, Func3 factory)
at Castle.DynamicProxy.Generators.InterfaceProxyWithTargetGenerator.GenerateCode(Type proxyTargetType, Type[] interfaces, ProxyGenerationOptions options)
at Castle.DynamicProxy.DefaultProxyBuilder.CreateInterfaceProxyTypeWithoutTarget(Type interfaceToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options)
at Castle.DynamicProxy.ProxyGenerator.CreateInterfaceProxyWithoutTarget(Type interfaceToProxy, Type[] additionalInterfacesToProxy, ProxyGenerationOptions options, IInterceptor[] interceptors)
at NSubstitute.Proxies.CastleDynamicProxy.CastleDynamicProxyFactory.CreateProxyUsingCastleProxyGenerator(Type typeToProxy, Type[] additionalInterfaces, Object[] constructorArguments, IInterceptor interceptor, ProxyGenerationOptions proxyGenerationOptions)
at NSubstitute.Proxies.CastleDynamicProxy.CastleDynamicProxyFactory.GenerateProxy(ICallRouter callRouter, Type typeToProxy, Type[] additionalInterfaces, Object[] constructorArguments)
at NSubstitute.Proxies.ProxyFactory.GenerateProxy(ICallRouter callRouter, Type typeToProxy, Type[] additionalInterfaces, Object[] constructorArguments)
at NSubstitute.Core.SubstituteFactory.Create(Type[] typesToProxy, Object[] constructorArguments, SubstituteConfig config)
at NSubstitute.Core.SubstituteFactory.Create(Type[] typesToProxy, Object[] constructorArguments)
at NSubstitute.Substitute.For(Type[] typesToProxy, Object[] constructorArguments)
at NSubstitute.Substitute.For[T](Object[] constructorArguments)
at WebApi.UnitTest.Controllers.HomeControllerV1Test.TestInitializer()

[AbhitejJohn]

Saw an instance of a similar issue here: dotnet/standard#295 . Does that help? Seems more of a .Net dependency resolution issue, so you might want to get help from the experts in the dotnet repo as well.

[skynetit]

@AbhitejJohn I tried to refer NETStandard.Library library in net462 unit test project. But faced the same issue

[AbhitejJohn]

@mailbala : I took a deeper look at this and this was pretty straight forward to repro. This has been fixed here: microsoft/vstest#428 and should work with the latest pre-release version of Microsoft.Net.Test.Sdk.
To give you a brief summary, there should have been a binding redirect generated for System.Runtime from 4.1.0.0 (referred by the ns1.5 Class Library) to 4.1.1.0 (which the ASP.NET Core app refers to in net462). The fix for the above does just this in an auto-generated config file for the test project.

Do feel free to re-open this issue if the above does not work for you.