diff --git a/app/src/test/java/ch/nuth/zhaw/exbox/ADS2_4_test.java b/app/src/test/java/ch/nuth/zhaw/exbox/ADS2_4_test.java
new file mode 100644
index 0000000..2e9f7a1
--- /dev/null
+++ b/app/src/test/java/ch/nuth/zhaw/exbox/ADS2_4_test.java
@@ -0,0 +1,80 @@
+package ch.nuth.zhaw.exbox;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * @(#)ListTest.java
+ *
+ *
+ * @author
+ * @version 1.00 2017/8/30
+ */
+public class ADS2_4_test {
+    MySortedList list;
+
+    @BeforeEach
+    public void setUp() {
+        list = new MySortedList();
+    }
+
+    @Test
+    public void testAdd() {
+        list.clear();
+        list.add("A");
+        Object o = list.get(0);
+        assertEquals("A", o);
+    }
+
+    @Test
+    public void testAdd2() {
+        list.clear();
+        list.add("B");
+        list.add("A");
+        assertEquals("A", list.get(0));
+        assertEquals("B", list.get(1));
+    }
+
+    @Test
+    public void testAdd3() {
+        list.clear();
+        list.add("C");
+        list.add("B");
+        list.add("A");
+        assertEquals("A", list.get(0));
+        assertEquals("B", list.get(1));
+        assertEquals("C", list.get(2));
+    }
+
+    @Test
+    public void testMixed() {
+        List<Character> list2 = new LinkedList<>();
+        for (int i = 0; i < 100; i++) {
+            Character c = (char) ('A' + (Math.random()*26));
+            int op = (int)(Math.random()*2);
+            switch (op) {
+                case 0:
+                    list.add(c);
+                    list2.add(c);
+                    break;
+                case 1:
+                    list.remove(c);
+                    list2.remove(c);
+                    break;
+            }
+        }
+        Collections.sort(list2);
+        assertEquals(list2.size(), list.size());
+        for (int i = 0; i < list.size(); i++) {
+            char c1 = (char)list.get(i);
+            char c2 = (char)list2.get(i);
+            assertEquals(c1, c2);
+        }
+    }
+}