static void TestRecover()
{
double min = -0.7, max = 1.5;
Assert.True(i1.Constrain(min, max) == new Interval(min, max));
Assert.True(i3.Constrain(min, max) == new Interval(1.0, max));
Assert.True(i4.Constrain(min, max) == new Interval(max, max));
Assert.True(i5.Constrain(min, max) == new Interval(min, min));
}