org.junit.Assert.assertEquals(TOP, sem.plus(TOP, TOP));
org.junit.Assert.assertEquals(TOP, sem.plus(TOP, new Interval(1,2)));
org.junit.Assert.assertEquals(TOP, sem.plus(TOP, new Interval(1,Double.POSITIVE_INFINITY)));
org.junit.Assert.assertEquals(TOP, sem.plus(TOP, new Interval(Double.NEGATIVE_INFINITY, 3)));
org.junit.Assert.assertEquals(TOP, sem.plus(new Interval(Double.NEGATIVE_INFINITY, -1), new Interval(1,Double.POSITIVE_INFINITY)));
org.junit.Assert.assertEquals(TOP, sem.plus(new Interval(Double.NEGATIVE_INFINITY, 1), new Interval(-1,Double.POSITIVE_INFINITY)));
org.junit.Assert.assertEquals(new Interval(Double.NEGATIVE_INFINITY, 4), sem.plus(new Interval(Double.NEGATIVE_INFINITY, -1), new Interval(3,5)));
org.junit.Assert.assertEquals(new Interval(Double.NEGATIVE_INFINITY, 4), sem.plus(new Interval(3,5), new Interval(Double.NEGATIVE_INFINITY, -1)));
org.junit.Assert.assertEquals(new Interval(-97, Double.POSITIVE_INFINITY), sem.plus(new Interval(3,Double.POSITIVE_INFINITY), new Interval(-100, -1)));
org.junit.Assert.assertEquals(new Interval(-97, Double.POSITIVE_INFINITY), sem.plus(new Interval(-100, -1), new Interval(3,Double.POSITIVE_INFINITY)));