Fixed Bug: Wrong behaviour of contains for empty snd interval

src/main/java/de/cebitec/common/sequencetools/intervals/IntegerIntervalOperations.java

@@ -43,7 +43,8 @@ public class IntegerIntervalOperations implements IntervalOperations<Integer> {
         fst = fst.as(Interval.Type.ZeroOpen);
         snd = snd.as(Interval.Type.ZeroOpen);
 
-        return fst.getStart() <= snd.getStart() && fst.getEnd() >= snd.getEnd();
+        return fst.getStart() <= snd.getStart() && fst.getEnd() >= snd.getEnd() // inside borders
+            && snd.getStart() < fst.getEnd(); // for empty snd interval
     }
 
     @Override
@@ -253,4 +254,6 @@ public class IntegerIntervalOperations implements IntervalOperations<Integer> {
         }
         return Intervals.createInterval(min, max);
     }
+    
+    
 }

src/test/java/de/cebitec/common/sequencetools/intervals/IntegerIntervalContainsOperationTest.java

@@ -43,7 +43,9 @@ public class IntegerIntervalContainsOperationTest {
             // same intervals
             {Intervals.createInterval(0, 10), Intervals.createInterval(0, 10), true},
             // not contained
-            {Intervals.createInterval(0, 10), Intervals.createInterval(2, 11), false}
+            {Intervals.createInterval(0, 10), Intervals.createInterval(2, 11), false},
+            // empty interval at end
+            {Intervals.createInterval(0, 10), Intervals.createInterval(10, 10), false}
         });
     }