/// <summary>
/// Sets the Messenger's default (static) instance to null.
/// </summary>
public static void Reset()
{
_defaultInstance = null;
}
/// <summary>
/// Provides a way to override the Messenger.Default instance with
/// a custom instance, for example for unit testing purposes.
/// </summary>
/// <param name="newMessenger">The instance that will be used as Messenger.Default.</param>
public static void OverrideDefault(Messenger newMessenger)
{
_defaultInstance = newMessenger;
}