diff --git a/Controller/ApiController.php b/Controller/ApiController.php
index 4bd91e0..e7b4ed4 100755
--- a/Controller/ApiController.php
+++ b/Controller/ApiController.php
@@ -32,6 +32,7 @@ use Modules\SupplierManagement\Models\SupplierAttributeTypeMapper;
 use Modules\SupplierManagement\Models\SupplierAttributeValue;
 use Modules\SupplierManagement\Models\SupplierAttributeValueMapper;
 use Modules\SupplierManagement\Models\SupplierMapper;
+use phpOMS\Localization\ISO639x1Enum;
 use phpOMS\Message\Http\RequestStatusCode;
 use phpOMS\Message\NotificationLevel;
 use phpOMS\Message\RequestAbstract;
@@ -269,8 +270,8 @@ final class ApiController extends Controller
      */
     private function createSupplierAttributeTypeL11nFromRequest(RequestAbstract $request) : SupplierAttributeTypeL11n
     {
-        $attrL11n = new SupplierAttributeTypeL11n();
-        $attrL11n->setType((int) ($request->getData('type') ?? 0));
+        $attrL11n       = new SupplierAttributeTypeL11n();
+        $attrL11n->type = (int) ($request->getData('type') ?? 0);
         $attrL11n->setLanguage((string) (
             $request->getData('language') ?? $request->getLanguage()
         ));
@@ -323,7 +324,6 @@ final class ApiController extends Controller
         }
 
         $attrType = $this->createSupplierAttributeTypeFromRequest($request);
-        $attrType->setL11n($request->getData('title'), $request->getData('language'));
         $this->createModel($request->header->account, $attrType, SupplierAttributeTypeMapper::class, 'attr_type', $request->getOrigin());
 
         $this->fillJsonResponse($request, $response, NotificationLevel::OK, 'Attribute type', 'Attribute type successfully created', $attrType);
@@ -341,9 +341,9 @@ final class ApiController extends Controller
     private function createSupplierAttributeTypeFromRequest(RequestAbstract $request) : SupplierAttributeType
     {
         $attrType = new SupplierAttributeType();
-        $attrType->setL11n((string) ($request->getData('name') ?? ''));
-        $attrType->setFields((int) ($request->getData('fields') ?? 0));
-        $attrType->setCustom((bool) ($request->getData('custom') ?? false));
+        $attrType->setL11n((string) ($request->getData('title') ?? ''), $request->getData('language') ?? ISO639x1Enum::_EN);
+        $attrType->fields = (int) ($request->getData('fields') ?? 0);
+        $attrType->custom = (bool) ($request->getData('custom') ?? false);
 
         return $attrType;
     }
@@ -360,8 +360,7 @@ final class ApiController extends Controller
     private function validateSupplierAttributeTypeCreate(RequestAbstract $request) : array
     {
         $val = [];
-        if (($val['name'] = empty($request->getData('name')))
-            || ($val['title'] = empty($request->getData('title')))
+        if (($val['title'] = empty($request->getData('title')))
         ) {
             return $val;
         }
@@ -490,7 +489,8 @@ final class ApiController extends Controller
         }
 
         $uploaded = $this->app->moduleManager->get('Media')->uploadFiles(
-            [$request->getData('name') ?? ''],
+            $request->getDataList('names') ?? [],
+            $request->getDataList('filenames') ?? [],
             $uploadedFiles,
             $request->header->account,
             __DIR__ . '/../../../Modules/Media/Files/Modules/SupplierManagement/' . ($request->getData('supplier') ?? '0'),
diff --git a/Controller/BackendController.php b/Controller/BackendController.php
index e3e1b47..4c26e6f 100755
--- a/Controller/BackendController.php
+++ b/Controller/BackendController.php
@@ -16,7 +16,6 @@ namespace Modules\SupplierManagement\Controller;
 
 use Modules\Billing\Models\BillTypeL11n;
 use Modules\Billing\Models\PurchaseBillMapper;
-use Modules\Media\Models\Media;
 use Modules\SupplierManagement\Models\SupplierMapper;
 use phpOMS\Asset\AssetType;
 use phpOMS\Contract\RenderableInterface;
diff --git a/Models/NullSupplierAttribute.php b/Models/NullSupplierAttribute.php
index 8e18513..de5af51 100755
--- a/Models/NullSupplierAttribute.php
+++ b/Models/NullSupplierAttribute.php
@@ -33,6 +33,7 @@ final class NullSupplierAttribute extends SupplierAttribute
      */
     public function __construct(int $id = 0)
     {
+        parent::__construct();
         $this->id = $id;
     }
 }
diff --git a/Models/Supplier.php b/Models/Supplier.php
index 91f8072..44e7e65 100755
--- a/Models/Supplier.php
+++ b/Models/Supplier.php
@@ -18,7 +18,6 @@ use Modules\Admin\Models\Address;
 use Modules\Admin\Models\NullAddress;
 use Modules\Editor\Models\EditorDoc;
 use Modules\Media\Models\Media;
-use Modules\Media\Models\NullMedia;
 use Modules\Profile\Models\ContactElement;
 use Modules\Profile\Models\NullContactElement;
 use Modules\Profile\Models\Profile;
@@ -43,15 +42,15 @@ class Supplier
 
     public string $number = '';
 
-    private string $numberReverse = '';
+    public string $numberReverse = '';
 
-    private int $status = 0;
+    private int $status = SupplierStatus::ACTIVE;
 
     private int $type = 0;
 
     public string $info = '';
 
-    private \DateTimeImmutable $createdAt;
+    public \DateTimeImmutable $createdAt;
 
     public Profile $profile;
 
@@ -79,6 +78,8 @@ class Supplier
 
     public Address $mainAddress;
 
+    private array $partners = [];
+
     /**
      * Constructor.
      *
@@ -103,36 +104,6 @@ class Supplier
         return $this->id;
     }
 
-    /**
-     * Get reverse number.
-     *
-     * @return string
-     *
-     * @since 1.0.0
-     */
-    public function getReverseNumber() : string
-    {
-        return $this->numberReverse;
-    }
-
-    /**
-     * Set revers number.
-     *
-     * @param string $numberReverse Reverse number
-     *
-     * @return void
-     *
-     * @since 1.0.0
-     */
-    public function setReverseNumber(string $numberReverse) : void
-    {
-        if (!\is_scalar($numberReverse)) {
-            throw new \Exception();
-        }
-
-        $this->numberReverse = $numberReverse;
-    }
-
     /**
      * Get status.
      *
@@ -185,32 +156,6 @@ class Supplier
         $this->type = $type;
     }
 
-    /**
-     * Get info.
-     *
-     * @return string
-     *
-     * @since 1.0.0
-     */
-    public function getInfo() : string
-    {
-        return $this->info;
-    }
-
-    /**
-     * Set info.
-     *
-     * @param string $info Info
-     *
-     * @return void
-     *
-     * @since 1.0.0
-     */
-    public function setInfo(string $info) : void
-    {
-        $this->info = $info;
-    }
-
     /**
      * Add doc to item
      *
@@ -299,7 +244,7 @@ class Supplier
      */
     private function orderContactElements(ContactElement $a, ContactElement $b) : int
     {
-        return $a->getOrder() <=> $b->getOrder();
+        return $a->order <=> $b->order;
     }
 
     /**
@@ -338,36 +283,16 @@ class Supplier
         $this->contactElements[] = $element;
     }
 
-    /**
-     * Get media file by type
-     *
-     * @param string $type Media type
-     *
-     * @return Media
-     *
-     * @since 1.0.0
-     */
-    public function getFileByType(string $type) : Media
-    {
-        foreach ($this->files as $file) {
-            if ($file->type === $type) {
-                return $file;
-            }
-        }
-
-        return new NullMedia();
-    }
-
     /**
      * Get all media files by type
      *
-     * @param string $type Media type
+     * @param null|int $type Media type
      *
      * @return Media[]
      *
      * @since 1.0.0
      */
-    public function getFilesByType(string $type) : array
+    public function getFilesByType(int $type = null) : array
     {
         $files = [];
         foreach ($this->files as $file) {
@@ -378,4 +303,27 @@ class Supplier
 
         return $files;
     }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function toArray() : array
+    {
+        return [
+            'id'            => $this->id,
+            'number'        => $this->number,
+            'numberReverse' => $this->numberReverse,
+            'status'        => $this->status,
+            'type'          => $this->type,
+            'info'          => $this->info,
+        ];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function jsonSerialize()
+    {
+        return $this->toArray();
+    }
 }
diff --git a/Models/SupplierAttribute.php b/Models/SupplierAttribute.php
index 8455a5c..b4e7e4f 100755
--- a/Models/SupplierAttribute.php
+++ b/Models/SupplierAttribute.php
@@ -58,6 +58,17 @@ class SupplierAttribute implements \JsonSerializable, ArrayableInterface
      */
     public SupplierAttributeValue $value;
 
+    /**
+     * Constructor.
+     *
+     * @since 1.0.0
+     */
+    public function __construct()
+    {
+        $this->type  = new SupplierAttributeType();
+        $this->value = new SupplierAttributeValue();
+    }
+
     /**
      * Get id
      *
@@ -75,7 +86,12 @@ class SupplierAttribute implements \JsonSerializable, ArrayableInterface
      */
     public function toArray() : array
     {
-        return [];
+        return [
+            'id'          => $this->id,
+            'supplier'    => $this->supplier,
+            'type'        => $this->type,
+            'value'       => $this->value,
+        ];
     }
 
     /**
diff --git a/Models/SupplierAttributeType.php b/Models/SupplierAttributeType.php
index 95091a5..fe80c14 100755
--- a/Models/SupplierAttributeType.php
+++ b/Models/SupplierAttributeType.php
@@ -41,7 +41,7 @@ class SupplierAttributeType implements \JsonSerializable, ArrayableInterface
      * @var string
      * @since 1.0.0
      */
-    protected string $name = ''; // @todo: currently not filled, should be used as identifier or if not required removed (at the moment it seems like it is useless?!)
+    public string $name = ''; // @todo: currently not filled, should be used as identifier or if not required removed (at the moment it seems like it is useless?!)
 
     /**
      * Which field data type is required (string, int, ...) in the value
@@ -49,7 +49,7 @@ class SupplierAttributeType implements \JsonSerializable, ArrayableInterface
      * @var int
      * @since 1.0.0
      */
-    protected int $fields = 0;
+    public int $fields = 0;
 
     /**
      * Is a custom value allowed (e.g. custom string)
@@ -57,7 +57,7 @@ class SupplierAttributeType implements \JsonSerializable, ArrayableInterface
      * @var bool
      * @since 1.0.0
      */
-    protected bool $custom = false;
+    public bool $custom = false;
 
     public string $validationPattern = '';
 
@@ -134,40 +134,19 @@ class SupplierAttributeType implements \JsonSerializable, ArrayableInterface
         return $this->l11n instanceof SupplierAttributeTypeL11n ? $this->l11n->title : $this->l11n;
     }
 
-    /**
-     * Set fields
-     *
-     * @param int $fields Fields
-     *
-     * @return void
-     *
-     * @since 1.0.0
-     */
-    public function setFields(int $fields) : void
-    {
-        $this->fields = $fields;
-    }
-
-    /**
-     * Set custom
-     *
-     * @param bool $custom FieldsCustom
-     *
-     * @return void
-     *
-     * @since 1.0.0
-     */
-    public function setCustom(bool $custom) : void
-    {
-        $this->custom = $custom;
-    }
-
     /**
      * {@inheritdoc}
      */
     public function toArray() : array
     {
-        return [];
+        return [
+            'id'                => $this->id,
+            'name'              => $this->name,
+            'fields'            => $this->fields,
+            'custom'            => $this->custom,
+            'validationPattern' => $this->validationPattern,
+            'isRequired'        => $this->isRequired,
+        ];
     }
 
     /**
diff --git a/Models/SupplierAttributeTypeL11n.php b/Models/SupplierAttributeTypeL11n.php
index 40e8e5f..1c58b1f 100755
--- a/Models/SupplierAttributeTypeL11n.php
+++ b/Models/SupplierAttributeTypeL11n.php
@@ -41,7 +41,7 @@ class SupplierAttributeTypeL11n implements \JsonSerializable, ArrayableInterface
      * @var int|SupplierAttributeType
      * @since 1.0.0
      */
-    protected int | SupplierAttributeType $type = 0;
+    public int | SupplierAttributeType $type = 0;
 
     /**
      * Language.
@@ -88,29 +88,15 @@ class SupplierAttributeTypeL11n implements \JsonSerializable, ArrayableInterface
     }
 
     /**
-     * Get attribute type
+     * Get language
      *
-     * @return int|SupplierAttributeType
+     * @return string
      *
      * @since 1.0.0
      */
-    public function getType()
+    public function getLanguage() : string
     {
-        return $this->type;
-    }
-
-    /**
-     * Set type.
-     *
-     * @param int $type Type id
-     *
-     * @return void
-     *
-     * @since 1.0.0
-     */
-    public function setType(int $type) : void
-    {
-        $this->type = $type;
+        return $this->language;
     }
 
     /**
@@ -132,7 +118,12 @@ class SupplierAttributeTypeL11n implements \JsonSerializable, ArrayableInterface
      */
     public function toArray() : array
     {
-        return [];
+        return [
+            'id'       => $this->id,
+            'title'    => $this->title,
+            'type'     => $this->type,
+            'language' => $this->language,
+        ];
     }
 
     /**
diff --git a/Models/SupplierAttributeValue.php b/Models/SupplierAttributeValue.php
index a43332a..ee134bb 100755
--- a/Models/SupplierAttributeValue.php
+++ b/Models/SupplierAttributeValue.php
@@ -189,6 +189,18 @@ class SupplierAttributeValue implements \JsonSerializable, ArrayableInterface
         $this->language = $language;
     }
 
+    /**
+     * Get language
+     *
+     * @return string
+     *
+     * @since 1.0.0
+     */
+    public function getLanguage() : string
+    {
+        return $this->language;
+    }
+
     /**
      * Set country
      *
@@ -203,12 +215,34 @@ class SupplierAttributeValue implements \JsonSerializable, ArrayableInterface
         $this->country = $country;
     }
 
+    /**
+     * Get country
+     *
+     * @return string
+     *
+     * @since 1.0.0
+     */
+    public function getCountry() : string
+    {
+        return $this->country;
+    }
+
     /**
      * {@inheritdoc}
      */
     public function toArray() : array
     {
-        return [];
+        return [
+            'id'        => $this->id,
+            'type'      => $this->type,
+            'valueInt'  => $this->valueInt,
+            'valueStr'  => $this->valueStr,
+            'valueDec'  => $this->valueDec,
+            'valueDat'  => $this->valueDat,
+            'isDefault' => $this->isDefault,
+            'language'  => $this->language,
+            'country'   => $this->country,
+        ];
     }
 
     /**
diff --git a/Models/SupplierStatus.php b/Models/SupplierStatus.php
new file mode 100644
index 0000000..dd20f57
--- /dev/null
+++ b/Models/SupplierStatus.php
@@ -0,0 +1,34 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   Modules\SupplierManagement\Models
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\Models;
+
+use phpOMS\Stdlib\Base\Enum;
+
+/**
+ * Supplier status enum.
+ *
+ * @package Modules\SupplierManagement\Models
+ * @license OMS License 1.0
+ * @link    https://orange-management.org
+ * @since   1.0.0
+ */
+abstract class SupplierStatus extends Enum
+{
+    public const ACTIVE = 1;
+
+    public const INACTIVE = 2;
+
+    public const BANNED = 4;
+}
diff --git a/Theme/Backend/supplier-list.tpl.php b/Theme/Backend/supplier-list.tpl.php
index 813d164..d5fce97 100755
--- a/Theme/Backend/supplier-list.tpl.php
+++ b/Theme/Backend/supplier-list.tpl.php
@@ -12,6 +12,7 @@
  */
 declare(strict_types=1);
 
+use Modules\Media\Models\NullMedia;
 use phpOMS\Uri\UriFactory;
 
 /** @var \phpOMS\Views\View $this */
diff --git a/Theme/Backend/supplier-profile.tpl.php b/Theme/Backend/supplier-profile.tpl.php
index a71d3bc..b7abe67 100755
--- a/Theme/Backend/supplier-profile.tpl.php
+++ b/Theme/Backend/supplier-profile.tpl.php
@@ -100,7 +100,7 @@ echo $this->getData('nav')->render();
 
                     <section class="portlet highlight-4">
                         <div class="portlet-body">
-                            <textarea class="undecorated"><?= $this->printHtml($supplier->getInfo()); ?></textarea>
+                            <textarea class="undecorated"><?= $this->printHtml($supplier->info); ?></textarea>
                         </div>
                     </section>
 
diff --git a/tests/Controller/Api/ApiControllerAttributeTrait.php b/tests/Controller/Api/ApiControllerAttributeTrait.php
new file mode 100644
index 0000000..299dbdb
--- /dev/null
+++ b/tests/Controller/Api/ApiControllerAttributeTrait.php
@@ -0,0 +1,221 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\tests\Controller\Api;
+
+use Modules\SupplierManagement\Models\AttributeValueType;
+use phpOMS\Localization\ISO3166TwoEnum;
+use phpOMS\Localization\ISO639x1Enum;
+use phpOMS\Message\Http\HttpRequest;
+use phpOMS\Message\Http\HttpResponse;
+use phpOMS\Message\Http\RequestStatusCode;
+use phpOMS\Uri\HttpUri;
+
+trait ApiControllerAttributeTrait
+{
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierAttributeTypeCreate() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('title', 'EN:1');
+        $request->setData('language', ISO639x1Enum::_EN);
+
+        $this->module->apiSupplierAttributeTypeCreate($request, $response);
+        self::assertGreaterThan(0, $response->get('')['response']->getId());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierAttributeTypeL11nCreate() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('title', 'DE:2');
+        $request->setData('type', '1');
+        $request->setData('language', ISO639x1Enum::_DE);
+
+        $this->module->apiSupplierAttributeTypeL11nCreate($request, $response);
+        self::assertGreaterThan(0, $response->get('')['response']->getId());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierAttributeValueIntCreate() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('default', '1');
+        $request->setData('attributetype', '1');
+        $request->setData('type', AttributeValueType::_INT);
+        $request->setData('value', '1');
+        $request->setData('language', ISO639x1Enum::_DE);
+        $request->setData('country', ISO3166TwoEnum::_DEU);
+
+        $this->module->apiSupplierAttributeValueCreate($request, $response);
+        self::assertGreaterThan(0, $response->get('')['response']->getId());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierAttributeValueStrCreate() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('type', AttributeValueType::_STRING);
+        $request->setData('value', '1');
+        $request->setData('language', ISO639x1Enum::_DE);
+        $request->setData('country', ISO3166TwoEnum::_DEU);
+
+        $this->module->apiSupplierAttributeValueCreate($request, $response);
+        self::assertGreaterThan(0, $response->get('')['response']->getId());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierAttributeValueFloatCreate() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('type', AttributeValueType::_FLOAT);
+        $request->setData('value', '1.1');
+        $request->setData('language', ISO639x1Enum::_DE);
+        $request->setData('country', ISO3166TwoEnum::_DEU);
+
+        $this->module->apiSupplierAttributeValueCreate($request, $response);
+        self::assertGreaterThan(0, $response->get('')['response']->getId());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierAttributeValueDatCreate() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('type', AttributeValueType::_DATETIME);
+        $request->setData('value', '2020-08-02');
+        $request->setData('language', ISO639x1Enum::_DE);
+        $request->setData('country', ISO3166TwoEnum::_DEU);
+
+        $this->module->apiSupplierAttributeValueCreate($request, $response);
+        self::assertGreaterThan(0, $response->get('')['response']->getId());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierAttributeCreate() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('supplier', '1');
+        $request->setData('value', '1');
+        $request->setData('type', '1');
+
+        $this->module->apiSupplierAttributeCreate($request, $response);
+        self::assertGreaterThan(0, $response->get('')['response']->getId());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierAttributeValueCreateInvalidData() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('invalid', '1');
+
+        $this->module->apiSupplierAttributeValueCreate($request, $response);
+        self::assertEquals(RequestStatusCode::R_400, $response->header->status);
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierAttributeTypeCreateInvalidData() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('invalid', '1');
+
+        $this->module->apiSupplierAttributeTypeCreate($request, $response);
+        self::assertEquals(RequestStatusCode::R_400, $response->header->status);
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierAttributeTypeL11nCreateInvalidData() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('invalid', '1');
+
+        $this->module->apiSupplierAttributeTypeL11nCreate($request, $response);
+        self::assertEquals(RequestStatusCode::R_400, $response->header->status);
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierAttributeCreateInvalidData() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('invalid', '1');
+
+        $this->module->apiSupplierAttributeCreate($request, $response);
+        self::assertEquals(RequestStatusCode::R_400, $response->header->status);
+    }
+}
diff --git a/tests/Controller/Api/ApiControllerSupplierTrait.php b/tests/Controller/Api/ApiControllerSupplierTrait.php
new file mode 100644
index 0000000..82608de
--- /dev/null
+++ b/tests/Controller/Api/ApiControllerSupplierTrait.php
@@ -0,0 +1,210 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\tests\Controller\Api;
+
+use Modules\Profile\Models\ContactType;
+use phpOMS\Localization\ISO3166TwoEnum;
+use phpOMS\Message\Http\HttpRequest;
+use phpOMS\Message\Http\HttpResponse;
+use phpOMS\Message\Http\RequestStatusCode;
+use phpOMS\System\MimeType;
+use phpOMS\Uri\HttpUri;
+use phpOMS\Utils\TestUtils;
+
+trait ApiControllerSupplierTrait
+{
+    public static function tearDownAfterClass() : void
+    {
+        if (\is_file(__DIR__ . '/m_icon_tmp.png')) {
+            \unlink(__DIR__ . '/m_icon_tmp.png');
+        }
+
+        if (\is_file(__DIR__ . '/Test file_tmp.txt')) {
+            \unlink(__DIR__ . '/Test file_tmp.txt');
+        }
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierCreate() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('number', '123456');
+        $request->setData('name1', 'Name1');
+        $request->setData('name2', 'Name2');
+        $request->setData('info', 'Info text');
+        $request->setData('address', 'Address');
+        $request->setData('postal', 'Postal');
+        $request->setData('city', 'City');
+        $request->setData('country', ISO3166TwoEnum::_USA);
+
+        $this->module->apiSupplierCreate($request, $response);
+        self::assertGreaterThan(0, $response->get('')['response']->getId());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierContactElementCreate() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('account', '1'); // supplier id in this case
+        $request->setData('type', ContactType::EMAIL);
+        $request->setData('content', 'email@email.com');
+
+        $this->module->apiContactElementCreate($request, $response);
+
+        self::assertGreaterThan(0, $response->get('')['response']->getId());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierContactElementCreateInvalidData() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('invalid', '1');
+
+        $this->module->apiContactElementCreate($request, $response);
+        self::assertEquals(RequestStatusCode::R_400, $response->header->status);
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierCreateInvalidData() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('invalid', '1');
+
+        $this->module->apiSupplierCreate($request, $response);
+        self::assertEquals(RequestStatusCode::R_400, $response->header->status);
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierProfileImageCreate() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        \copy(__DIR__ . '/m_icon.png', __DIR__ . '/m_icon_tmp.png');
+
+        $request->header->account = 1;
+        $request->setData('name', '123456 backend');
+        $request->setData('supplier', 1);
+        $request->setData('type', 'backend_image');
+
+        TestUtils::setMember($request, 'files', [
+            'file1' => [
+                'name'     => '123456.png',
+                'type'     => MimeType::M_PNG,
+                'tmp_name' => __DIR__ . '/m_icon_tmp.png',
+                'error'    => \UPLOAD_ERR_OK,
+                'size'     => \filesize(__DIR__ . '/m_icon_tmp.png'),
+            ],
+        ]);
+
+        $this->module->apiFileCreate($request, $response);
+        $file = $response->get('')['response'];
+        self::assertGreaterThan(0, \reset($file)->getId());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierFileCreate() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        \copy(__DIR__ . '/Test file.txt', __DIR__ . '/Test file_tmp.txt');
+
+        $request->header->account = 1;
+        $request->setData('name', 'test file backend');
+        $request->setData('supplier', 1);
+
+        TestUtils::setMember($request, 'files', [
+            'file1' => [
+                'name'     => 'Test file.txt',
+                'type'     => MimeType::M_TXT,
+                'tmp_name' => __DIR__ . '/Test file_tmp.txt',
+                'error'    => \UPLOAD_ERR_OK,
+                'size'     => \filesize(__DIR__ . '/Test file_tmp.txt'),
+            ],
+        ]);
+
+        $this->module->apiFileCreate($request, $response);
+        $file = $response->get('')['response'];
+        self::assertGreaterThan(0, \reset($file)->getId());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiSupplierNoteCreate() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+
+        $MARKDOWN = "# Test Title\n\nThis is **some** text.";
+
+        $request->setData('id', 1);
+        $request->setData('title', \trim(\strtok($MARKDOWN, "\n"), ' #'));
+        $request->setData('plain', \preg_replace('/^.+\n/', '', $MARKDOWN));
+
+        $this->module->apiNoteCreate($request, $response);
+        self::assertGreaterThan(0, $response->get('')['response']->getId());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Controller\ApiController
+     * @group module
+     */
+    public function testApiFileCreateInvalidData() : void
+    {
+        $response = new HttpResponse();
+        $request  = new HttpRequest(new HttpUri(''));
+
+        $request->header->account = 1;
+        $request->setData('invalid', '1');
+
+        $this->module->apiFileCreate($request, $response);
+        self::assertEquals(RequestStatusCode::R_400, $response->header->status);
+    }
+}
diff --git a/tests/Controller/Api/Test file.txt b/tests/Controller/Api/Test file.txt
new file mode 100644
index 0000000..bdf08de
--- /dev/null
+++ b/tests/Controller/Api/Test file.txt	
@@ -0,0 +1 @@
+test file
\ No newline at end of file
diff --git a/tests/Controller/Api/m_icon.png b/tests/Controller/Api/m_icon.png
new file mode 100644
index 0000000..587d4f9
Binary files /dev/null and b/tests/Controller/Api/m_icon.png differ
diff --git a/tests/Controller/ApiControllerTest.php b/tests/Controller/ApiControllerTest.php
new file mode 100644
index 0000000..c2e9b49
--- /dev/null
+++ b/tests/Controller/ApiControllerTest.php
@@ -0,0 +1,93 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\tests\Controller;
+
+use Model\CoreSettings;
+use Modules\Admin\Models\AccountPermission;
+use Modules\SupplierManagement\tests\Controller\Api\ApiControllerAttributeTrait;
+use Modules\SupplierManagement\tests\Controller\Api\ApiControllerSupplierTrait;
+use phpOMS\Account\Account;
+use phpOMS\Account\AccountManager;
+use phpOMS\Account\PermissionType;
+use phpOMS\Application\ApplicationAbstract;
+use phpOMS\DataStorage\Session\HttpSession;
+use phpOMS\Dispatcher\Dispatcher;
+use phpOMS\Event\EventManager;
+use phpOMS\Module\ModuleAbstract;
+use phpOMS\Module\ModuleManager;
+use phpOMS\Router\WebRouter;
+use phpOMS\Utils\TestUtils;
+
+/**
+ * @testdox Modules\SupplierManagement\tests\Controller\ApiControllerTest: SupplierManagement api controller
+ *
+ * @internal
+ */
+final class ApiControllerTest extends \PHPUnit\Framework\TestCase
+{
+    protected ApplicationAbstract $app;
+
+    /**
+     * @var \Modules\SupplierManagement\Controller\ApiController
+     */
+    protected ModuleAbstract $module;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp() : void
+    {
+        $this->app = new class() extends ApplicationAbstract
+        {
+            protected string $appName = 'Api';
+        };
+
+        $this->app->dbPool         = $GLOBALS['dbpool'];
+        $this->app->orgId          = 1;
+        $this->app->accountManager = new AccountManager($GLOBALS['session']);
+        $this->app->appSettings    = new CoreSettings();
+        $this->app->moduleManager  = new ModuleManager($this->app, __DIR__ . '/../../../../Modules/');
+        $this->app->dispatcher     = new Dispatcher($this->app);
+        $this->app->eventManager   = new EventManager($this->app->dispatcher);
+        $this->app->eventManager->importFromFile(__DIR__ . '/../../../../Web/Api/Hooks.php');
+        $this->app->sessionManager = new HttpSession(36000);
+
+        $account = new Account();
+        TestUtils::setMember($account, 'id', 1);
+
+        $permission = new AccountPermission();
+        $permission->setUnit(1);
+        $permission->setApp('backend');
+        $permission->setPermission(
+            PermissionType::READ
+            | PermissionType::CREATE
+            | PermissionType::MODIFY
+            | PermissionType::DELETE
+            | PermissionType::PERMISSION
+        );
+
+        $account->addPermission($permission);
+
+        $this->app->accountManager->add($account);
+        $this->app->router = new WebRouter();
+
+        $this->module = $this->app->moduleManager->get('SupplierManagement');
+
+        TestUtils::setMember($this->module, 'app', $this->app);
+    }
+
+    use ApiControllerSupplierTrait;
+    use ApiControllerAttributeTrait;
+}
diff --git a/tests/Models/NullSupplierAttributeTest.php b/tests/Models/NullSupplierAttributeTest.php
new file mode 100644
index 0000000..d01c97b
--- /dev/null
+++ b/tests/Models/NullSupplierAttributeTest.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\NullSupplierAttribute;
+
+/**
+ * @internal
+ */
+final class NullSupplierAttributeTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttribute
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttribute', new NullSupplierAttribute());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttribute
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullSupplierAttribute(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullSupplierAttributeTypeL11nTest.php b/tests/Models/NullSupplierAttributeTypeL11nTest.php
new file mode 100644
index 0000000..566d51d
--- /dev/null
+++ b/tests/Models/NullSupplierAttributeTypeL11nTest.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\NullSupplierAttributeTypeL11n;
+
+/**
+ * @internal
+ */
+final class NullSupplierAttributeTypeL11nTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeTypeL11n
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttributeTypeL11n', new NullSupplierAttributeTypeL11n());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeTypeL11n
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullSupplierAttributeTypeL11n(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullSupplierAttributeTypeTest.php b/tests/Models/NullSupplierAttributeTypeTest.php
new file mode 100644
index 0000000..bca6b8f
--- /dev/null
+++ b/tests/Models/NullSupplierAttributeTypeTest.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\NullSupplierAttributeType;
+
+/**
+ * @internal
+ */
+final class NullSupplierAttributeTypeTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeType
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttributeType', new NullSupplierAttributeType());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeType
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullSupplierAttributeType(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/NullSupplierAttributeValueTest.php b/tests/Models/NullSupplierAttributeValueTest.php
new file mode 100644
index 0000000..c64ccd2
--- /dev/null
+++ b/tests/Models/NullSupplierAttributeValueTest.php
@@ -0,0 +1,42 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\NullSupplierAttributeValue;
+
+/**
+ * @internal
+ */
+final class NullSupplierAttributeValueTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeValue
+     * @group framework
+     */
+    public function testNull() : void
+    {
+        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttributeValue', new NullSupplierAttributeValue());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\NullSupplierAttributeValue
+     * @group framework
+     */
+    public function testId() : void
+    {
+        $null = new NullSupplierAttributeValue(2);
+        self::assertEquals(2, $null->getId());
+    }
+}
diff --git a/tests/Models/SupplierAttributeTest.php b/tests/Models/SupplierAttributeTest.php
new file mode 100644
index 0000000..bdd84ff
--- /dev/null
+++ b/tests/Models/SupplierAttributeTest.php
@@ -0,0 +1,63 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\SupplierAttribute;
+
+/**
+ * @internal
+ */
+final class SupplierAttributeTest extends \PHPUnit\Framework\TestCase
+{
+    private SupplierAttribute $attribute;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp() : void
+    {
+        $this->attribute = new SupplierAttribute();
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttribute
+     * @group module
+     */
+    public function testDefault() : void
+    {
+        self::assertEquals(0, $this->attribute->getId());
+        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttributeType', $this->attribute->type);
+        self::assertInstanceOf('\Modules\SupplierManagement\Models\SupplierAttributeValue', $this->attribute->value);
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttribute
+     * @group module
+     */
+    public function testSerialize() : void
+    {
+        $serialized = $this->attribute->jsonSerialize();
+
+        self::assertEquals(
+            [
+                'id',
+                'supplier',
+                'type',
+                'value',
+            ],
+            \array_keys($serialized)
+        );
+    }
+}
diff --git a/tests/Models/SupplierAttributeTypeL11nTest.php b/tests/Models/SupplierAttributeTypeL11nTest.php
new file mode 100644
index 0000000..771d557
--- /dev/null
+++ b/tests/Models/SupplierAttributeTypeL11nTest.php
@@ -0,0 +1,87 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\SupplierAttributeTypeL11n;
+use phpOMS\Localization\ISO639x1Enum;
+
+/**
+ * @internal
+ */
+final class SupplierAttributeTypeL11nTest extends \PHPUnit\Framework\TestCase
+{
+    private SupplierAttributeTypeL11n $l11n;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp() : void
+    {
+        $this->l11n = new SupplierAttributeTypeL11n();
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeTypeL11n
+     * @group module
+     */
+    public function testDefault() : void
+    {
+        self::assertEquals(0, $this->l11n->getId());
+        self::assertEquals('', $this->l11n->title);
+        self::assertEquals(0, $this->l11n->type);
+        self::assertEquals(ISO639x1Enum::_EN, $this->l11n->getLanguage());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeTypeL11n
+     * @group module
+     */
+    public function testNameInputOutput() : void
+    {
+        $this->l11n->title = 'TestName';
+        self::assertEquals('TestName', $this->l11n->title);
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeTypeL11n
+     * @group module
+     */
+    public function testLanguageInputOutput() : void
+    {
+        $this->l11n->setLanguage(ISO639x1Enum::_DE);
+        self::assertEquals(ISO639x1Enum::_DE, $this->l11n->getLanguage());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeTypeL11n
+     * @group module
+     */
+    public function testSerialize() : void
+    {
+        $this->l11n->title  = 'Title';
+        $this->l11n->type   = 2;
+        $this->l11n->setLanguage(ISO639x1Enum::_DE);
+
+        self::assertEquals(
+            [
+                'id'        => 0,
+                'title'     => 'Title',
+                'type'      => 2,
+                'language'  => ISO639x1Enum::_DE,
+            ],
+            $this->l11n->jsonSerialize()
+        );
+    }
+}
diff --git a/tests/Models/SupplierAttributeTypeTest.php b/tests/Models/SupplierAttributeTypeTest.php
new file mode 100644
index 0000000..bf44fb7
--- /dev/null
+++ b/tests/Models/SupplierAttributeTypeTest.php
@@ -0,0 +1,82 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\SupplierAttributeType;
+use Modules\SupplierManagement\Models\SupplierAttributeTypeL11n;
+
+/**
+ * @internal
+ */
+final class SupplierAttributeTypeTest extends \PHPUnit\Framework\TestCase
+{
+    private SupplierAttributeType $type;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp() : void
+    {
+        $this->type = new SupplierAttributeType();
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeType
+     * @group module
+     */
+    public function testDefault() : void
+    {
+        self::assertEquals(0, $this->type->getId());
+        self::assertEquals('', $this->type->getL11n());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeType
+     * @group module
+     */
+    public function testL11nInputOutput() : void
+    {
+        $this->type->setL11n('Test');
+        self::assertEquals('Test', $this->type->getL11n());
+
+        $this->type->setL11n(new SupplierAttributeTypeL11n(0, 'NewTest'));
+        self::assertEquals('NewTest', $this->type->getL11n());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeType
+     * @group module
+     */
+    public function testSerialize() : void
+    {
+        $this->type->name                = 'Title';
+        $this->type->fields              = 2;
+        $this->type->custom              = true;
+        $this->type->validationPattern   = '\d*';
+        $this->type->isRequired          = true;
+
+        self::assertEquals(
+            [
+                'id'                => 0,
+                'name'              => 'Title',
+                'fields'            => 2,
+                'custom'            => true,
+                'validationPattern' => '\d*',
+                'isRequired'        => true,
+            ],
+            $this->type->jsonSerialize()
+        );
+    }
+}
diff --git a/tests/Models/SupplierAttributeValueTest.php b/tests/Models/SupplierAttributeValueTest.php
new file mode 100644
index 0000000..488f5da
--- /dev/null
+++ b/tests/Models/SupplierAttributeValueTest.php
@@ -0,0 +1,133 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\tests\Models;
+
+use Modules\SupplierManagement\Models\SupplierAttributeValue;
+use phpOMS\Localization\ISO3166TwoEnum;
+use phpOMS\Localization\ISO639x1Enum;
+
+/**
+ * @internal
+ */
+final class SupplierAttributeValueTest extends \PHPUnit\Framework\TestCase
+{
+    private SupplierAttributeValue $value;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp() : void
+    {
+        $this->value = new SupplierAttributeValue();
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeValue
+     * @group module
+     */
+    public function testDefault() : void
+    {
+        self::assertEquals(0, $this->value->getId());
+        self::assertNull($this->value->getValue());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeValue
+     * @group module
+     */
+    public function testLanguageInputOutput() : void
+    {
+        $this->value->setLanguage(ISO639x1Enum::_DE);
+        self::assertEquals(ISO639x1Enum::_DE, $this->value->getLanguage());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeValue
+     * @group module
+     */
+    public function testCountryInputOutput() : void
+    {
+        $this->value->setCountry(ISO3166TwoEnum::_DEU);
+        self::assertEquals(ISO3166TwoEnum::_DEU, $this->value->getCountry());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeValue
+     * @group module
+     */
+    public function testValueIntInputOutput() : void
+    {
+        $this->value->setValue(1);
+        self::assertEquals(1, $this->value->getValue());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeValue
+     * @group module
+     */
+    public function testValueFloatInputOutput() : void
+    {
+        $this->value->setValue(1.1);
+        self::assertEquals(1.1, $this->value->getValue());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeValue
+     * @group module
+     */
+    public function testValueStringInputOutput() : void
+    {
+        $this->value->setValue('test');
+        self::assertEquals('test', $this->value->getValue());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeValue
+     * @group module
+     */
+    public function testValueDateInputOutput() : void
+    {
+        $this->value->setValue($dat = new \DateTime('now'));
+        self::assertEquals($dat->format('Y-m-d'), $this->value->getValue()->format('Y-m-d'));
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\SupplierAttributeValue
+     * @group module
+     */
+    public function testSerialize() : void
+    {
+        $this->value->type = 1;
+        $this->value->setValue('test');
+        $this->value->isDefault = true;
+        $this->value->setLanguage(ISO639x1Enum::_DE);
+        $this->value->setCountry(ISO3166TwoEnum::_DEU);
+
+        self::assertEquals(
+            [
+                'id'           => 0,
+                'type'         => 1,
+                'valueInt'     => null,
+                'valueStr'     => 'test',
+                'valueDec'     => null,
+                'valueDat'     => null,
+                'isDefault'    => true,
+                'language'     => ISO639x1Enum::_DE,
+                'country'      => ISO3166TwoEnum::_DEU,
+            ],
+            $this->value->jsonSerialize()
+        );
+    }
+}
diff --git a/tests/Models/SupplierTest.php b/tests/Models/SupplierTest.php
new file mode 100644
index 0000000..51000bc
--- /dev/null
+++ b/tests/Models/SupplierTest.php
@@ -0,0 +1,137 @@
+<?php
+/**
+ * Orange Management
+ *
+ * PHP Version 8.0
+ *
+ * @package   tests
+ * @copyright Dennis Eichhorn
+ * @license   OMS License 1.0
+ * @version   1.0.0
+ * @link      https://orange-management.org
+ */
+declare(strict_types=1);
+
+namespace Modules\SupplierManagement\tests\Models;
+
+use Modules\Editor\Models\EditorDoc;
+use Modules\Media\Models\Media;
+use Modules\Profile\Models\ContactElement;
+use Modules\SupplierManagement\Models\Supplier;
+use Modules\SupplierManagement\Models\SupplierStatus;
+
+/**
+ * @internal
+ */
+final class SupplierTest extends \PHPUnit\Framework\TestCase
+{
+    private Supplier $supplier;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function setUp() : void
+    {
+        $this->supplier = new Supplier();
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\Supplier
+     * @group module
+     */
+    public function testDefault() : void
+    {
+        self::assertEquals(0, $this->supplier->getId());
+        self::assertEquals('', $this->supplier->number);
+        self::assertEquals('', $this->supplier->numberReverse);
+        self::assertEquals('', $this->supplier->info);
+        self::assertEquals(SupplierStatus::ACTIVE, $this->supplier->getStatus());
+        self::assertEquals(0, $this->supplier->getType());
+        self::assertEquals([], $this->supplier->getNotes());
+        self::assertEquals([], $this->supplier->getFiles());
+        self::assertEquals([], $this->supplier->getAddresses());
+        self::assertEquals([], $this->supplier->getContactElements());
+        self::assertEquals([], $this->supplier->getFilesByType(0));
+        self::assertEquals((new \DateTime('now'))->format('Y-m-d'), $this->supplier->createdAt->format('Y-m-d'));
+        self::assertInstanceOf('\Modules\Profile\Models\Profile', $this->supplier->profile);
+        self::assertInstanceOf('\Modules\Admin\Models\Address', $this->supplier->mainAddress);
+        self::assertInstanceOf('\Modules\Profile\Models\NullContactElement', $this->supplier->getMainContactElement(0));
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\Supplier
+     * @group module
+     */
+    public function testStatusInputOutput() : void
+    {
+    	$this->supplier->setStatus(SupplierStatus::INACTIVE);
+    	self::assertEquals(SupplierStatus::INACTIVE, $this->supplier->getStatus());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\Supplier
+     * @group module
+     */
+    public function testTypeInputOutput() : void
+    {
+        $this->supplier->setType(2);
+        self::assertEquals(2, $this->supplier->getType());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\Supplier
+     * @group module
+     */
+    public function testFileInputOutput() : void
+    {
+        $this->supplier->addFile($temp = new Media());
+        self::assertCount(1, $this->supplier->getFiles());
+        self::assertEquals([$temp], $this->supplier->getFilesByType());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\Supplier
+     * @group module
+     */
+    public function testContactElementInputOutput() : void
+    {
+        $this->supplier->addContactElement($temp = new ContactElement());
+        self::assertCount(1, $this->supplier->getContactElements());
+        self::assertEquals($temp, $this->supplier->getMainContactElement(0));
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\Supplier
+     * @group module
+     */
+    public function testNoteInputOutput() : void
+    {
+        $this->supplier->addNote(new EditorDoc());
+        self::assertCount(1, $this->supplier->getNotes());
+    }
+
+    /**
+     * @covers Modules\SupplierManagement\Models\Supplier
+     * @group module
+     */
+    public function testSerialize() : void
+    {
+        $this->supplier->number        = '123456';
+        $this->supplier->numberReverse = '654321';
+        $this->supplier->setStatus(SupplierStatus::INACTIVE);
+        $this->supplier->setType(2);
+        $this->supplier->info = 'Test info';
+
+        self::assertEquals(
+            [
+                'id'            => 0,
+                'number'        => '123456',
+                'numberReverse' => '654321',
+                'status'        => SupplierStatus::INACTIVE,
+                'type'          => 2,
+                'info'          => 'Test info',
+            ],
+            $this->supplier->jsonSerialize()
+        );
+    }
+}