public void Line_UnitVector()
{
Line testLine = new Line(Point.MakePointWithInches(2, 3, 1), Point.MakePointWithInches(5, -7, 0));
Vector unitVector = testLine.UnitVector(new Inch());
unitVector.Magnitude.Should().Be(new Distance(new Centimeter(), 2.54));
unitVector.Direction.Should().Be(testLine.Direction);
unitVector.BasePoint.Should().Be(testLine.BasePoint);
}