Every genuine test of a theory is an attempt to falsify it, or to refute it.
The only way to test a hypothesis is to look for all the information that disagrees with it.
Good tests kill flawed theories; we remain alive to guess again.
The game of science is, in principle, without end. He who decides one day that scientific statements do not call for any further test, and that they can be regarded as finally verified, retires from the game.