Validate server JSON with org.json as well

build.gradle

@@ -381,6 +381,7 @@ project(":tests"){
         testImplementation "org.junit.jupiter:junit-jupiter-params:5.7.1"
         testImplementation "org.junit.jupiter:junit-jupiter-api:5.7.1"
         testImplementation arcModule("backends:backend-headless")
+        testImplementation "org.json:json:20230618"
         testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:5.7.1"
     }
 

tests/src/test/java/ApplicationTests.java

@@ -26,6 +26,7 @@ import mindustry.type.*;
 import mindustry.world.*;
 import mindustry.world.blocks.payloads.*;
 import mindustry.world.blocks.storage.*;
+import org.json.*;
 import org.junit.jupiter.api.*;
 import org.junit.jupiter.params.*;
 import org.junit.jupiter.params.provider.*;
@@ -227,11 +228,14 @@ public class ApplicationTests{
     void serverListJson(){
         String[] files = {"servers_v6.json", "servers_v7.json", "servers_be.json"};
 
+
         for(String file : files){
             try{
                 String str = Core.files.absolute("./../../" + file).readString();
                 assertEquals(ValueType.array, new JsonReader().parse(str).type());
                 assertTrue(Jval.read(str).isArray());
+                JSONArray array = new JSONArray(str);
+                assertTrue(array.length() > 0);
             }catch(Exception e){
                 fail("Failed to parse " + file, e);
             }