Using TDD: “top down” vs. “bottom up”

Question

Since I\'m a TDD newbie, I\'m currently developing a tiny C# console application in order to practice (because practice makes perfect, right?). I started by making a simple sket

Answer 1

The main should be very simple in the end. I don't know how it looks like in c#, but in c++ it should look something like this :

#include "something"

int main( int argc, char *argv[])
{
  return TaskClass::Run( argc, argv );
}

Pass already created objects to the constructors of classes, but in unit tests pass mock objects.

For more info about TDD, take a look at these screencasts. They explain how to do agile development, but it also talks how to do TDD, with examples in c#.