private static void TestIntervalOps(R1Interval x, R1Interval y, string expected)
{
// Test all of the interval operations on the given pair of intervals.
// "expected" is a sequence of "T" and "F" characters corresponding to
// the expected results of Contains(), InteriorContains(), Intersects(),
// and InteriorIntersects() respectively.
Assert.Equal(expected[0] == 'T', x.Contains(y));
Assert.Equal(expected[1] == 'T', x.InteriorContains(y));
Assert.Equal(expected[2] == 'T', x.Intersects(y));
Assert.Equal(expected[3] == 'T', x.InteriorIntersects(y));
Assert.Equal(x.Contains(y), x.Union(y) == x);
Assert.Equal(x.Intersects(y), !x.Intersection(y).IsEmpty());
R1Interval z = x;
z = R1Interval.AddInterval(z, y);
Assert.Equal(x.Union(y), z);
}
