added a method to find all ghosts currently seated in the train and added repo structure for tests as well as an empty test class

src/main/java/ch/unibas/dmi/dbis/cs108/gamelogic/GameState.java

@@ -91,6 +91,20 @@ public class GameState {
     return clientVoteData;
   }
 
+  /**
+   * Collects the current position of all ghosts and saves them in an array
+   * @return Boolean array, true if there is a ghost at that position
+   */
+  public boolean[] getPositionOfGhosts(){
+    boolean[] ghosts = new boolean[passengerTrain.length];
+    for(int i = 0; i < passengerTrain.length; i++) {
+      if(passengerTrain[i].getIsGhost()) {
+        ghosts[i] = true;
+      }
+    }
+    return ghosts;
+  }
+
   /**
    * Changes the name of the passenger in the Array that has the oldName
    * @param oldName the old Name of the Passenger to be name-changed

src/test/java/ch/unibas/dmi/dbis/cs108/gamelogic/klassenstruktur/GameStateTests.java

@@ -0,0 +1,5 @@
+package ch.unibas.dmi.dbis.cs108.gamelogic.klassenstruktur;
+
+public class GameStateTests {
+
+}