diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/util/AggregatedObservableList.java b/HMCL/src/main/java/org/jackhuang/hmcl/util/AggregatedObservableList.java
index c40ead106..5798661f0 100644
--- a/HMCL/src/main/java/org/jackhuang/hmcl/util/AggregatedObservableList.java
+++ b/HMCL/src/main/java/org/jackhuang/hmcl/util/AggregatedObservableList.java
@@ -187,6 +187,10 @@ public class AggregatedObservableList<T> {
 
     }
 
+    public String dump() {
+        return dump(x -> x);
+    }
+
     public String dump(Function<T, Object> function) {
         StringBuilder sb = new StringBuilder();
         sb.append("[");
diff --git a/HMCL/src/test/java/org/jackhuang/hmcl/util/AggregatedObservableListTest.java b/HMCL/src/test/java/org/jackhuang/hmcl/util/AggregatedObservableListTest.java
new file mode 100644
index 000000000..6d81bf48f
--- /dev/null
+++ b/HMCL/src/test/java/org/jackhuang/hmcl/util/AggregatedObservableListTest.java
@@ -0,0 +1,94 @@
+package org.jackhuang.hmcl.util;
+
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Testing the AggregatedObservableList
+ */
+public class AggregatedObservableListTest {
+
+
+    @Test
+    public void testInteger() {
+        final AggregatedObservableList<Integer> aggregatedWrapper = new AggregatedObservableList<>();
+        final ObservableList<Integer> aggregatedList = aggregatedWrapper.getAggregatedList();
+
+        final ObservableList<Integer> list1 = FXCollections.observableArrayList();
+        final ObservableList<Integer> list2 = FXCollections.observableArrayList();
+        final ObservableList<Integer> list3 = FXCollections.observableArrayList();
+
+        list1.addAll(1, 2, 3, 4, 5);
+        list2.addAll(10, 11, 12, 13, 14, 15);
+        list3.addAll(100, 110, 120, 130, 140, 150);
+
+        // adding list 1 to aggregate
+        aggregatedWrapper.appendList(list1);
+        assertEquals("[1,2,3,4,5]", aggregatedWrapper.dump());
+
+        // removing elems from list1
+        list1.remove(2, 4);
+        assertEquals("[1,2,5]", aggregatedWrapper.dump());
+
+        // adding second List
+        aggregatedWrapper.appendList(list2);
+        assertEquals("[1,2,5,10,11,12,13,14,15]", aggregatedWrapper.dump());
+
+        // removing elems from second List
+        list2.remove(1, 3);
+        assertEquals("[1,2,5,10,13,14,15]", aggregatedWrapper.dump());
+
+        // replacing element in first list
+        list1.set(1, 3);
+        assertEquals("[1,3,5,10,13,14,15]", aggregatedWrapper.dump());
+
+        // adding third List
+        aggregatedWrapper.appendList(list3);
+        assertEquals("[1,3,5,10,13,14,15,100,110,120,130,140,150]", aggregatedWrapper.dump());
+
+        // emptying second list
+        list2.clear();
+        assertEquals("[1,3,5,100,110,120,130,140,150]", aggregatedWrapper.dump());
+
+        // adding new elements to second list
+        list2.addAll(203, 202, 201);
+        assertEquals("[1,3,5,203,202,201,100,110,120,130,140,150]", aggregatedWrapper.dump());
+
+        // sorting list2. this results in permutation
+        list2.sort(Integer::compareTo);
+        assertEquals("[1,3,5,201,202,203,100,110,120,130,140,150]", aggregatedWrapper.dump());
+
+        // removing list2 completely
+        aggregatedWrapper.removeList(list2);
+        assertEquals("[1,3,5,100,110,120,130,140,150]", aggregatedWrapper.dump());
+
+        // updating one integer value in list 3
+        list3.set(0, 1);
+        assertEquals("[1,3,5,1,110,120,130,140,150]", aggregatedWrapper.dump());
+
+        // prepending list 2 again
+        aggregatedWrapper.prependList(list2);
+        assertEquals("[201,202,203,1,3,5,1,110,120,130,140,150]", aggregatedWrapper.dump());
+
+    }
+
+    @Test
+    public void testSetAll() {
+        final AggregatedObservableList<Integer> aggregatedWrapper = new AggregatedObservableList<>();
+        final ObservableList<Integer> aggregatedList = aggregatedWrapper.getAggregatedList();
+
+        final ObservableList<Integer> a = FXCollections.singletonObservableList(1);
+        final ObservableList<Integer> b = FXCollections.observableArrayList(2, 3, 4);
+
+        aggregatedWrapper.appendList(a);
+        aggregatedWrapper.appendList(b);
+
+        assertEquals("[1,2,3,4]", aggregatedWrapper.dump());
+
+        b.setAll(7, 8, 9);
+        assertEquals("[1,7,8,9]", aggregatedWrapper.dump());
+    }
+}
\ No newline at end of file