public void CollisionState_Previous_ShouldSubtractStepFromOffset()
{
// Arrange
Entity e1 = new EntityWall(0, 0, 10, 10);
e1.Speed = new Vector(4, 0);
CollisionState cs1 = new CollisionState(e1, 4);
Vector expected = new Vector(1, 0);
// Act
cs1.Next();
cs1.Next();
cs1.Previous();
// Assert
Assert.AreEqual(expected, cs1.Rectangle.Position);
}
public void CollisionState_Done_WhenOffsetSmallerThanSpeed_ShouldReturnFalse()
{
// Arrange
Entity e1 = new EntityWall(0, 0, 10, 10);
e1.Speed = new Vector(4, 0);
CollisionState cs1 = new CollisionState(e1, 4);
// Act
cs1.Next();
// Assert
Assert.IsFalse(cs1.Done);
}
public void CollisionState_Rectangle_ShouldReturnEntityAtCurrentHypotheticalFlooredPosition()
{
// Arrange
Entity e1 = new EntityWall(0, 0, 10, 10);
e1.Speed = new Vector(4, 0);
CollisionState cs1 = new CollisionState(e1, 4);
// Act
cs1.Next();
Rectangle r1 = cs1.Rectangle;
// Assert
Assert.AreEqual(new Vector(1, 0), cs1.Rectangle.Position);
}
public void CollisionState_Next_ShouldAddStepToOffset()
{
// Arrange
Entity e1 = new EntityWall(0, 0, 10, 10);
e1.Speed = new Vector(4, 0);
CollisionState cs1 = new CollisionState(e1, 4);
Vector expected = new Vector(1, 0);
// Act
cs1.Next();
// Assert
Assert.AreEqual(expected, cs1.Rectangle.Position);
}
public void CollisionState_Done_WhenOffsetGreaterThanSpeed_ShouldReturnTrue()
{
// Arrange
Entity e1 = new EntityWall(0, 0, 10, 10);
e1.Speed = new Vector(4, 0);
CollisionState cs1 = new CollisionState(e1, 4);
// Act
for (int i = 0; i < 5; i++)
{
cs1.Next();
}
// Assert
Assert.IsTrue(cs1.Done);
}
public void CollisionState_Fraction_ShouldReturnOffsetDividedBySpeed()
{
// Arrange
Entity e1 = new EntityWall(0, 0, 10, 10);
e1.Speed = new Vector(4, 0);
CollisionState cs1 = new CollisionState(e1, 4);
double expected = 1 / e1.Speed.Length;
// Act
cs1.Next();
double frac = cs1.Fraction;
// Assert
Assert.AreEqual(expected, frac);
}