public void IntervalFromMidpointAndWidth()
{
double m = 1.0;
double w = 4.0;
Interval ab = Interval.FromMidpointAndWidth(m, w);
Assert.IsTrue(ab.Width == w);
Assert.IsTrue(ab.Midpoint == m);
Assert.IsTrue(ab.LeftEndpoint == m - w / 2.0);
Assert.IsTrue(ab.RightEndpoint == m + w / 2.0);
}