Checkpoint: ExchangeServiceTest

Signed-off-by: Marcin Woźniak <y0rune@aol.com>

buisnesslogic/src/main/java/com/plannaplan/services/ExchangeService.java

@@ -1,10 +1,13 @@
 package com.plannaplan.services;
 
+import java.sql.Timestamp;
 import java.util.ArrayList;
+import java.util.Comparator;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Optional;
 import java.util.Set;
+import java.util.TreeSet;
 import java.util.stream.Collectors;
 
 import com.plannaplan.entities.Assignment;
@@ -116,9 +119,11 @@ public class ExchangeService {
 	       final Exchange exchangeOne = (Exchange) m[0];
 	       final Exchange exchangeTwo = (Exchange) m[1];
 	       return new MatchData(exchangeOne, exchangeTwo);
+
 	   }).collect(Collectors.toList());
 
-       final Set<MatchData> filterMatches = new HashSet<>(matches);
+       Set<MatchData> filterMatches = new TreeSet<>((m1, m2) -> m1.compare(m2));
+       filterMatches.addAll(matches);
        return filterMatches;
    }
 }