Antlr4.Runtime.Test.TestIntervalSet.TestEmptyIntersection C# (CSharp) Method

        public void TestEmptyIntersection()
        {
            IntervalSet s = IntervalSet.Of('a', 'z');
            IntervalSet s2 = IntervalSet.Of('0', '9');
            String expecting = "{}";
            String result = (s.And(s2)).ToString();
            Assert.AreEqual(expecting, result);
        }