public void UnionWith_SimplifiesSet_ReturnsOtherInterval()
{
var set = new[]
{
new IntegerInterval(0, true, 1, false),
new IntegerInterval(2, true, 3, false),
};
var interval = new IntegerInterval(1, true, 2, false);
var actual = set.UnionWith(interval);
var single = actual.Single(); // Asserts that the array contains a single entry.
Assert.That(single.Start, Is.EqualTo(0));
Assert.That(single.End, Is.EqualTo(3));
}