title: Mvx container and unit testing
body: <p>I need to override Mvx container behavior, to inject some mock objects when my real code ask to container (as a service locator) to resolve some interface.</p>
  
  <p>What are the minimum interface required to deal with that ? Actually, I didnt understand how <code>IMvxIoCProvider</code> and <code>IMvxServiceProvider</code> interfaces works.</p>
  
  <p>Looking up to <code>BaseIoCSupportingTest</code> example in MvxMod project, I could notice there's another interface required: <code>IMvxServiceProviderRegistry</code>. Why do we need that ?</p>
  
  <p>How can I simply register a  <code>IMvxIoCProvider</code> which should wrap <code>MvxSimpleIoCContainer</code> when running a context of Unit Testing?</p>
  
  <p>Thanks a lot guys.</p>