public void Setup()
{
_source = Substitute.For<IGameObject>();
_source.Radius.Returns(20f);
_source.Position.Returns(new Vector2(0, 0));
_source.Mass.Returns(100f);
_participant = Substitute.For<IGameObject>();
_participant.Radius.Returns(5f);
_participant.Position.Returns(new Vector2(50, 50));
_participant.Mass.Returns(10f);
_gravitySimulator = new GravitySimulator();
_gravitySimulator.RegisterParticipant(_participant);
_gravitySimulator.RegisterSource(_source);
}
