public void Travel_nowhere_in_no_time(double primaryForce, double mass, int delay, double secondaryForce)
{
var haggis = new Haggis(primaryForce, mass, delay, secondaryForce);
var distanceTravelled = haggis.GetDistanceTravelled(0);
Assert.That(distanceTravelled, Is.EqualTo(0));
}
public void Travel_at_constant_speed_when_secondary_force_kicks_in_immediately(double primaryForce, double mass, double secondaryForce, int time)
{
const int noDelay = 0;
var haggis = new Haggis(primaryForce, mass, noDelay, secondaryForce);
var distanceTravelled = haggis.GetDistanceTravelled(time);
var expectedDistance = AccelerationDistance(primaryForce + secondaryForce, mass, time);
Assert.That(distanceTravelled, Is.EqualTo(expectedDistance));
}
public void Travel_at_constant_speed_when_no_secondary_force_kicks_in(double primaryForce, double mass, int time)
{
var delay = time;
const int secondaryForce = 20;
var haggis = new Haggis(primaryForce, mass, delay, secondaryForce);
var distanceTravelled = haggis.GetDistanceTravelled(time);
var expectedDistance = AccelerationDistance(primaryForce, mass, time);
Assert.That(distanceTravelled, Is.EqualTo(expectedDistance));
}
public void Speed_up_half_way_through_when_another_force_is_applied(double primaryForce, double mass, int delay, double secondaryForce, int time)
{
var haggis = new Haggis(primaryForce, mass, delay, secondaryForce);
var distanceTravelled = haggis.GetDistanceTravelled(time);
var primaryDistance = AccelerationDistance(primaryForce, mass, delay);
var continuingDistance = Acceleration(primaryForce, mass) * delay * (time - delay);
var secondaryDistance = AccelerationDistance(primaryForce + secondaryForce, mass, time - delay);
var expectedDistance = primaryDistance + continuingDistance + secondaryDistance;
Assert.That(distanceTravelled, Is.EqualTo(expectedDistance));
}