Loading assembly dependencies with Powershell

Hello:

I'm poking around with using Powershell for some unit testing. I'm having a
little trouble with something:

I see that I can use [System.Reflection.LoadFrom()] to load an assembly, but
what if my assembly has dependencies? (since its code that was freshly
built, neither the dependencies nor the target assembly are in the GAC)

It would be really nice if I could load my "top level" assembly, and then
have all of the assemblies that it references be loaded automatically. Is
there a built-in or publically scripted way to do this, or will I need to
write my own?