fix tests

Author: PawelGerr

test/Thinktecture.Runtime.Extensions.SourceGenerator.Tests/CodeAnalysis/InstanceMemberInfoTests/CreateOrNull_Field.cs

@@ -598,7 +598,7 @@ public class TestClass
    private readonly int _field;
 }
 ";
-      var compilation = CreateCompilation(src);
+      var compilation = CreateCompilation(src, additionalReferences: [typeof(MessagePack.KeyAttribute).Assembly.Location]);
       var factory = TypedMemberStateFactory.Create(compilation);
       var type = GetTypeSymbol(compilation, "Test.TestClass");
 

test/Thinktecture.Runtime.Extensions.SourceGenerator.Tests/CodeAnalysis/InstanceMemberInfoTests/CreateOrNull_Property.cs

@@ -672,7 +672,7 @@ public class TestClass
    public int Property { get; }
 }
 ";
-      var compilation = CreateCompilation(src);
+      var compilation = CreateCompilation(src, additionalReferences: [typeof(MessagePack.KeyAttribute).Assembly.Location]);
       var factory = TypedMemberStateFactory.Create(compilation);
       var type = GetTypeSymbol(compilation, "Test.TestClass");
       var property = (IPropertySymbol)type.GetMembers("Property").First();

test/Thinktecture.Runtime.Extensions.SourceGenerator.Tests/CodeAnalysis/InstanceMemberInfoTests/GetHashCode.cs

@@ -517,7 +517,7 @@ public class TestClass
    private readonly int _field2;
 }
 ";
-      var compilation = CreateCompilation(src);
+      var compilation = CreateCompilation(src, additionalReferences: [typeof(MessagePack.KeyAttribute).Assembly.Location]);
       var factory = TypedMemberStateFactory.Create(compilation);
       var type = GetTypeSymbol(compilation, "Test.TestClass");
       var field1 = (IFieldSymbol)type.GetMembers("_field1").First();