feat: implemented NPC serialization properly

src/test/java/uulm/teamname/marvelous/gamelibrary/json/ingame/serialize/EntitySerializerTest.java

@@ -12,12 +12,13 @@ import uulm.teamname.marvelous.gamelibrary.json.ingame.deserialize.EntityDeseria
 
 import static org.mockito.Mockito.*;
 import static org.junit.jupiter.api.Assertions.*;
+import static org.assertj.core.api.Assertions.*;
 
 class EntitySerializerTest {
 
 
     @Test
-    void notATestJustSomethingToRun() throws JsonProcessingException {
+    void serializeCharacter() throws JsonProcessingException {
         var mapper = new ObjectMapper();
 
         var chara = new Character(
@@ -35,9 +36,21 @@ class EntitySerializerTest {
         chara.inventory.addStone(StoneType.SpaceStone);
         chara.inventory.addStone(StoneType.MindStone);
 
-        var result = mapper.writeValueAsString(chara);
+        var jsonRepresentingCharacter = """
+                {
+                "entityType":"Character",
+                "name":"CoolHeroThing",
+                "PID":1,
+                "ID":1,
+                "HP":200,
+                "MP":300,
+                "AP":8,
+                "stones":[1,2,5],
+                "position":[12,24]
+                }""".replace("\n", "");
 
-        System.out.println(result);
+        assertThat(mapper.writeValueAsString(chara))
+                .isEqualTo(jsonRepresentingCharacter);
     }
 
-}
+}