Do not allow reset if game not started once

commands1_output.txt

@@ -4,7 +4,7 @@ Error, can not get buildings: game not started
 Error, can not get resources: game not started
 Error, invalid list-buildings argument: none expected
 Error, invalid list-resources argument: none expected
-OK
+Error, can not reset a game that is not started!
 Error, invalid reset argument: none expected
 Error, not expecting dice roll
 Error, invalid start argument value(s)

src/edu/kit/informatik/Main.java

@@ -3,6 +3,18 @@ package edu.kit.informatik;
 import edu.kit.informatik.ui.CommandLine;
 
 public final class Main {
+    /**
+     * Utility class -> private constructor.
+     */
+    private Main() {
+
+    }
+
+    /**
+     * Program entry point.
+     *
+     * @param args command-line arguments
+     */
     public static void main(String[] args) {
         CommandLine.startInteractive();
     }

src/edu/kit/informatik/model/CardGame.java

@@ -203,11 +203,13 @@ public class CardGame {
     }
 
     public void reset() {
-        if (cardStack != null) {
+        if (cardStack == null) {
+            throw new InvalidInputException("can not reset a game that is not started!");
+        } else {
             this.currentCardStack = new ArrayDeque<>(cardStack);
         }
-        this.resources = new ArrayDeque<>();
+        this.resources.clear();
-        this.items = new ArrayList<>();
+        this.items.clear();
         this.fightingAnimal = false;
         this.awaitedDiceSize = null;
         this.minimumDiceRoll = null;