diff --git a/src/test/java/uulm/teamname/marvelous/gamelibrary/json/ingame/serialize/EntitySerializerTest.java b/src/test/java/uulm/teamname/marvelous/gamelibrary/json/ingame/serialize/EntitySerializerTest.java
index ae72b5a..f773f64 100644
--- a/src/test/java/uulm/teamname/marvelous/gamelibrary/json/ingame/serialize/EntitySerializerTest.java
+++ b/src/test/java/uulm/teamname/marvelous/gamelibrary/json/ingame/serialize/EntitySerializerTest.java
@@ -6,6 +6,7 @@ import org.junit.jupiter.api.Test;
 import uulm.teamname.marvelous.gamelibrary.IntVector2;
 import uulm.teamname.marvelous.gamelibrary.entities.*;
 import uulm.teamname.marvelous.gamelibrary.entities.Character;
+import uulm.teamname.marvelous.gamelibrary.entities.Rock;
 import uulm.teamname.marvelous.gamelibrary.json.ingame.deserialize.EntityDeserializer;
 
 import java.util.ArrayList;
@@ -19,6 +20,10 @@ class EntitySerializerTest {
 
     @Test
     void serializeCharacter() throws JsonProcessingException {
+
+        //test if all required values are set in json
+        // and that this is done in the right order as defined in the methods serialize() and serializeCharacter().
+
         var mapper = new ObjectMapper();
 
         var chara = new Character(
@@ -55,12 +60,19 @@ class EntitySerializerTest {
 
     @Test
     void serializeNPC() throws JsonProcessingException {
+
+        //test if all required values are set in json
+        // and that this is done in the right order as defined in the methods serialize() and serializeNPC().
+
         var mapper = new ObjectMapper();
 
+        //________________________________________________
+
         ArrayList<StoneType> al = new ArrayList<>();
         al.add(StoneType.MindStone);
         al.add(StoneType.PowerStone);
 
+
         var npc = new NPC(
                 new EntityID(EntityType.NPC, 3),
                 new IntVector2(12, 24),
@@ -80,13 +92,51 @@ class EntitySerializerTest {
         assertThat(mapper.writeValueAsString(npc))
                 .isEqualTo(jsonRepresentingNPC);
 
-       // System.out.println(mapper.writeValueAsString(npc));
+        //________________________________________________
+
+       // al.removeStone(StoneType.MindStone);
+        //Inventory inv = new Inventory(al);
+        var npc0= new NPC(
+                new EntityID(EntityType.NPC, 3),
+                new IntVector2(12, 24));
+        npc0.inventory.addStone(StoneType.SoulStone);
+        npc0.inventory.addStone(StoneType.TimeStone);
+
+         jsonRepresentingNPC = """
+                {
+                "entityType":"NPC",
+                "ID":3,
+                "MP":0,
+                "stones":[4,5],
+                "position":[12,24]
+                }""".replace("\n", "");
+
+       // System.out.println(mapper.writeValueAsString(npc0));
+        assertThat(mapper.writeValueAsString(npc0))
+                .isEqualTo(jsonRepresentingNPC);
+
+        npc0.inventory.removeStone(StoneType.TimeStone);
+
+        jsonRepresentingNPC = """
+                {
+                "entityType":"NPC",
+                "ID":3,
+                "MP":0,
+                "stones":[5],
+                "position":[12,24]
+                }""".replace("\n", "");
+
+       //System.out.println(mapper.writeValueAsString(npc0));
+        assertThat(mapper.writeValueAsString(npc0))
+                .isEqualTo(jsonRepresentingNPC);
+
+        //________________________________________________
 
         var npc2 = new NPC(
                 new EntityID(EntityType.NPC, 3),
                 new IntVector2(12, 24));
 
-        //test if all values are set in json and that this is done in the right order as defined in the method serializeNPC().
+        //test if all required values are set in json and that this is done in the right order as defined in the methods serialize() and serializeNPC().
          jsonRepresentingNPC = """
                 {
                 "entityType":"NPC",
@@ -96,7 +146,7 @@ class EntitySerializerTest {
                 "position":[12,24]
                 }""".replace("\n", "");
 
-       // System.out.println(mapper.writeValueAsString(npc2));
+
         assertThat(mapper.writeValueAsString(npc2))
                 .isEqualTo(jsonRepresentingNPC);
 
@@ -111,10 +161,12 @@ class EntitySerializerTest {
                 "position":[12,24]
                 }""".replace("\n", "");
 
-       // System.out.println(mapper.writeValueAsString(npc2));
+
         assertThat(mapper.writeValueAsString(npc2))
                 .isEqualTo(jsonRepresentingNPC);
 
+        //________________________________________________
+
         var npc3 = new NPC(
                 new EntityID(EntityType.NPC, 3),
                 new IntVector2(12, 24),
@@ -129,10 +181,71 @@ class EntitySerializerTest {
                 "position":[12,24]
                 }""".replace("\n", "");
 
-       // System.out.println(mapper.writeValueAsString(npc3));
         assertThat(mapper.writeValueAsString(npc3))
                 .isEqualTo(jsonRepresentingNPC);
 
     }
 
+    @Test
+    void serializeRock() throws JsonProcessingException {
+
+        var mapper = new ObjectMapper();
+
+        Rock rock1 = new Rock(
+                new EntityID(EntityType.Rocks, 3),
+                new IntVector2(12, 24),
+                200);
+
+        var jsonRepresentingNPC = """
+                {
+                "entityType":"Rock",
+                "ID":3,
+                "HP":200,
+                "position":[12,24]
+                }""".replace("\n", "");
+
+       // System.out.println(mapper.writeValueAsString(rock1));
+        assertThat(mapper.writeValueAsString(rock1))
+                .isEqualTo(jsonRepresentingNPC);
+
+        rock1.decreaseHp(50);
+
+         jsonRepresentingNPC = """
+                {
+                "entityType":"Rock",
+                "ID":3,
+                "HP":150,
+                "position":[12,24]
+                }""".replace("\n", "");
+
+        //System.out.println(mapper.writeValueAsString(rock1));
+        assertThat(mapper.writeValueAsString(rock1))
+                .isEqualTo(jsonRepresentingNPC);
+
+    }
+
+    @Test
+    void serializeInfinityStone() throws JsonProcessingException {
+
+        var mapper = new ObjectMapper();
+
+        InfinityStone inf1 = new InfinityStone(
+                new EntityID(EntityType.InfinityStones, 3),
+                new IntVector2(12, 24),
+                StoneType.PowerStone);
+
+        var jsonRepresentingNPC = """
+                {
+                "entityType":"InfinityStone",
+                "ID":3,
+                "position":[12,24]
+                }""".replace("\n", "");
+
+         System.out.println(mapper.writeValueAsString(inf1));
+        assertThat(mapper.writeValueAsString(inf1))
+                .isEqualTo(jsonRepresentingNPC);
+
+       
+    }
+
 }