diff --git a/src/Api.php b/src/Api.php
index b078d2a..4c16bf9 100644
--- a/src/Api.php
+++ b/src/Api.php
@@ -42,17 +42,17 @@ class Api {
         $password = $password ?: config('nami.auth.password');
         $groupid = $groupid ?: config('nami.auth.groupid');
 
-        Http::withOptions(['cookies' => $this->cookie])->get(self::$url.'/ica/pages/login.jsp');
-        $response = Http::asForm()->withOptions(['cookies' => $this->cookie])->post(self::$url.'/ica/rest/nami/auth/manual/sessionStartup', [
+        $this->http()->get(self::$url.'/ica/pages/login.jsp');
+        $response = $this->http()->asForm()->post(self::$url.'/ica/rest/nami/auth/manual/sessionStartup', [
             'Login' => 'API',
             'redirectTo' => './app.jsp',
             'username' => $mglnr,
             'password' => $password
-        ])->json();
+        ]);
 
-        if ($response['statusCode'] !== 0) {
+        if ($response->json()['statusCode'] !== 0) {
             $e = new LoginException();
-            $e->setResponse($response);
+            $e->setResponse($response->json());
             throw $e;
         }
 
diff --git a/src/Backend/FakeBackend.php b/src/Backend/FakeBackend.php
index 94beef6..5c919a3 100644
--- a/src/Backend/FakeBackend.php
+++ b/src/Backend/FakeBackend.php
@@ -5,10 +5,14 @@ namespace Zoomyboy\LaravelNami\Backend;
 use Illuminate\Http\Client\Response;
 use Illuminate\Support\Facades\Http;
 use GuzzleHttp\Psr7\Response as GuzzleResponse;
+use GuzzleHttp\Cookie\SetCookie;
 
 class FakeBackend {
 
     private $members;
+    private $passwords;
+    public $groups = [];
+    public $loggedInAs = null;
 
     public function __construct() {
         $this->members = collect([]);
@@ -19,6 +23,7 @@ class FakeBackend {
     }
 
     public function cookie($cookie) {
+        $this->cookie = $cookie;
         return $this;
     }
 
@@ -35,10 +40,30 @@ class FakeBackend {
             return;
         }
 
-        throw new \Exception('no handler found for URL '.$url);
+        $this->urlNotFoundException($url);
     }
 
     public function get($url) {
+        if (preg_match('|/ica/rest/nami/mitglied/filtered-for-navigation/gruppierung/gruppierung/([0-9]+)/flist|', $url, $matches)) {
+            list($url, $groupId) = $matches;
+
+            $members = $this->members->filter(function($m) use ($groupId) {
+                return $m['gruppierungId'] == $groupId;
+            })->map(function($member) {
+                return [
+                    "entries_id" => $member['id'],
+                    "id" => $member['id'],
+                    "entries_mitgliedsNummer" => $member['id'],
+                ];
+            });
+            return $this->response([
+                "success" => true,
+                'data' => $members,
+                "responseType" => "OK",
+                "metaData" => []
+            ]);
+        }
+
         if (preg_match('|/ica/rest/nami/mitglied/filtered-for-navigation/gruppierung/gruppierung/([0-9]+)/([0-9]+)|', $url, $matches)) {
             list($url, $groupId, $memberId) = $matches;
 
@@ -51,6 +76,80 @@ class FakeBackend {
                 'data' => $member
             ])));
         }
+
+        if ($url === 'https://nami.dpsg.de/ica/pages/login.jsp') {
+            return;
+        }
+
+        if ($url === 'https://nami.dpsg.de/ica/rest/nami/gruppierungen/filtered-for-navigation/gruppierung/node/root') {
+            $groups = collect(data_get($this->groups, $this->loggedInAs))->map(function($group) {
+                return [
+                    "descriptor" => "Solingen-Wald, Silva 100105",
+                    "name" => "",
+                    "representedClass" => "de.iconcept.nami.entity.org.Gruppierung",
+                    "id" => $group
+                ];
+            })->toArray();
+
+            return $this->response([
+                "success" => true,
+                "data" => $groups,
+                "responseType" => "OK"
+            ]);
+        }
+
+        $this->urlNotFoundException($url);
+    }
+
+    public function post($url, $data) {
+        if ($url === 'https://nami.dpsg.de/ica/rest/nami/auth/manual/sessionStartup') {
+            if (!data_get($data, 'username') || !data_get($data, 'password')) {
+                return $this->wrongLoginResponse();
+            }
+
+            if ($this->passwords[data_get($data, 'username')] === data_get($data, 'password')) {
+                $this->loggedInAs = data_get($data, 'username');
+                $this->cookie->setCookie(tap(SetCookie::fromString('JSESSIONID=rZMBv1McDAJ-KukQ6BboJBTq.srv-nami06; path=/ica'), function($cookie) {
+                    $cookie->setDomain('nami.dpsg.de');
+                }));
+                return $this->response([
+                    "statusCode" => 0,
+                ]);
+            }
+        }
+
+        $this->urlNotFoundException($url);
+    }
+
+    private function wrongLoginResponse() {
+        return $this->response([
+            "servicePrefix" => null,
+            "methodCall" => null,
+            "response" => null,
+            "statusCode" => 3000,
+            "statusMessage" => "Benutzer nicht gefunden oder Passwort falsch.",
+            "apiSessionName" => "JSESSIONID",
+            "apiSessionToken" => "qrjlt_YFVhtRPU-epc-58AB1",
+            "minorNumber" => 0,
+            "majorNumber" => 0,
+        ]);
+    }
+
+    public function response($data) {
+        return new Response(new GuzzleResponse(200, [], json_encode($data)));
+    }
+
+    public function fakeNamiPassword($mglnr, $password, $groups) {
+        $this->passwords[$mglnr] = $password;
+        $this->groups[$mglnr] = $groups;
+    }
+
+    public function asForm() {
+        return $this;
+    }
+
+    public function urlNotFoundException($url) {
+        throw new \Exception('no handler found for URL '.$url);
     }
 
 }
diff --git a/src/FakesNami.php b/src/FakesNami.php
index 97328e8..7fdd3ce 100644
--- a/src/FakesNami.php
+++ b/src/FakesNami.php
@@ -25,4 +25,8 @@ trait FakesNami {
         }
     }
 
+    public function fakeNamiPassword($mglnr, $password, $groups) {
+        Backend::fakeNamiPassword($mglnr, $password, $groups);
+    }
+
 }
diff --git a/src/Providers/NamiUserProvider.php b/src/Providers/NamiUserProvider.php
index fc5d128..a1f836f 100644
--- a/src/Providers/NamiUserProvider.php
+++ b/src/Providers/NamiUserProvider.php
@@ -43,8 +43,9 @@ class NamiUserProvider implements UserProvider {
                 return false;
             }
                 
-            Cache::forever('member.'.$credentials['mglnr'], [
-                'data' => $data,
+            Cache::forever('namicookie-'.$credentials['mglnr'], [
+                'data' => $data->toArray(),
+                'cookie' => $api->cookie->toArray(),
                 'credentials' => $credentials
             ]);