public void BrakingForceIsProportionalToVelocity(Vector2 velocity0, Vector2 velocity1)
{
var forceCalculator = new VehicleForces(constants.Object);
var brakePedal = 1.0f;
var force0 = forceCalculator.GetBrakingForce(brakePedal, velocity0);
var force1 = forceCalculator.GetBrakingForce(brakePedal, velocity1);
var ratio = force1.Length() / force0.Length();
Assert.True(ratio >= 1);
}
public void BrakingForceIsProportionalToBrakePedal(float brakePedal0, float brakePedal1)
{
var forceCalculator = new VehicleForces(constants.Object);
var velocity = new Vector2(0, 28);
var force0 = forceCalculator.GetBrakingForce(brakePedal0, velocity);
var force1 = forceCalculator.GetBrakingForce(brakePedal1, velocity);
var ratio = force1.Length() / force0.Length();
var ratioIsGreaterThanOne = ratio > 1;
var ratioEqualsOne = Math.Abs(1 - ratio) < float.Epsilon;
var brakePedalRatiosAreEqual = Math.Abs(brakePedal1 - brakePedal0) < float.Epsilon;
// The ratio is either greater than one OR the ratio is one if and
// only if the brake pedal ratios are equal.
Assert.True(ratioIsGreaterThanOne || ((ratioEqualsOne && brakePedalRatiosAreEqual) || (!ratioEqualsOne && !brakePedalRatiosAreEqual)));
}
