Test initialization of permission handlers in PermissionManager

src/main/java/fr/xephi/authme/permission/PermissionsManager.java

@@ -1,5 +1,6 @@
 package fr.xephi.authme.permission;
 
+import com.google.common.annotations.VisibleForTesting;
 import fr.xephi.authme.ConsoleLogger;
 import fr.xephi.authme.initialization.Reloadable;
 import fr.xephi.authme.listener.JoiningPlayer;
@@ -41,8 +42,7 @@ public class PermissionsManager implements Reloadable {
 
     private final Server server;
     private final PluginManager pluginManager;
-
-    private Settings settings;
+    private final Settings settings;
 
     /**
      * The permission handler that is currently in use.
@@ -76,7 +76,8 @@ public class PermissionsManager implements Reloadable {
      * Setup and hook into the permissions systems.
      */
     @PostConstruct
-    private void setup() {
+    @VisibleForTesting
+    void setup() {
         if (settings.getProperty(PluginSettings.FORCE_VAULT_HOOK)) {
             try {
                 PermissionHandler handler = createPermissionHandler(PermissionsSystemType.VAULT);

src/main/java/fr/xephi/authme/permission/handlers/LuckPermsHandler.java

@@ -36,8 +36,7 @@ public class LuckPermsHandler implements PermissionHandler {
         try {
             luckPermsApi = LuckPerms.getApi();
         } catch (IllegalStateException e) {
-            e.printStackTrace();
-            throw new PermissionHandlerException("Could not get api of LuckPerms");
+            throw new PermissionHandlerException("Could not get api of LuckPerms", e);
         }
     }
 

src/main/java/fr/xephi/authme/permission/handlers/PermissionHandlerException.java

@@ -9,4 +9,8 @@ public class PermissionHandlerException extends Exception {
     public PermissionHandlerException(String message) {
         super(message);
     }
+
+    public PermissionHandlerException(String message, Throwable cause) {
+        super(message, cause);
+    }
 }