Resolving assemblies can be a tricky business. MbUnit has a complex support for this but it is not always sufficient. In order to give full flexibility, one can define a assembly resolver type that will be used by MbUnit to resolve assemblies (as well as the default behavior).

There are 2 stops to implement this feature:

1. Implement IAssemblyResolver (MbUnit.Core.Framework), don't forget to have a public constructor without arguments,
2. Add a assembly level custom attribute AssemblyResolverAttribute with the type of the IAssemblyResolver implementation

public class MyAssemblyResolver : IAssemblyResolver
 {
     public Assembly Resolve(string assemblyName)
     { ... }
 }

 [assembly: AssemblyResolver(typeof(MyAssemblyResolver))]