diff --git a/src/Application/Controller/Admin/AdminOrder.php b/src/Application/Controller/Admin/AdminOrder.php
index d9d70c3..34a5b86 100644
--- a/src/Application/Controller/Admin/AdminOrder.php
+++ b/src/Application/Controller/Admin/AdminOrder.php
@@ -21,13 +21,19 @@ use D3\Linkmobility4OXID\Application\Model\MessageTypes\Sms;
 use D3\Linkmobility4OXID\Application\Model\OrderRecipients;
 use D3\LinkmobilityClient\Response\ResponseInterface;
 use D3\LinkmobilityClient\ValueObject\Recipient;
-use Exception;
+use D3\TestingTools\Production\IsMockable;
+use InvalidArgumentException;
 use OxidEsales\Eshop\Application\Controller\Admin\AdminController;
 use OxidEsales\Eshop\Application\Model\Order;
+use OxidEsales\Eshop\Core\Language;
 use OxidEsales\Eshop\Core\Registry;
+use OxidEsales\Eshop\Core\Request;
+use OxidEsales\Eshop\Core\UtilsView;
 
 class AdminOrder extends AdminController
 {
+    use IsMockable;
+
     protected $_sThisTemplate = 'd3adminorder.tpl';
 
     /**
@@ -42,12 +48,13 @@ class AdminOrder extends AdminController
 
     public function __construct()
     {
-        $this->order = $order = oxNew(Order::class);
+        $this->order = $order = $this->d3GetMockableOxNewObject(Order::class);
         $order->load($this->getEditObjectId());
 
         $this->addTplParam('recipient', $this->getRecipientFromCurrentOrder());
 
         parent::__construct();
+
     }
 
     /**
@@ -56,48 +63,82 @@ class AdminOrder extends AdminController
     public function getRecipientFromCurrentOrder()
     {
         try {
-            return oxNew(OrderRecipients::class, $this->order)->getSmsRecipient();
+            return $this->d3GetMockableOxNewObject(OrderRecipients::class, $this->order)->getSmsRecipient();
         } catch (noRecipientFoundException $e) {
             /** @var string $message */
-            $message = Registry::getLang()->translateString($e->getMessage());
-            Registry::getUtilsView()->addErrorToDisplay($message);
+            $message = $this->d3GetMockableRegistryObject(Language::class)->translateString($e->getMessage());
+            $this->d3GetMockableRegistryObject(UtilsView::class)->addErrorToDisplay($message);
         }
         return false;
     }
 
     /**
      * @return void
-     * @throws Exception
      */
     public function send(): void
     {
-        $messageBody = Registry::getRequest()->getRequestEscapedParameter('messagebody');
-
-        if (false === is_string($messageBody) || strlen($messageBody) <= 1) {
-            /** @var string $message */
-            $message = Registry::getLang()->translateString('D3LM_EXC_MESSAGE_NO_LENGTH');
-            Registry::getUtilsView()->addErrorToDisplay($message);
-            return;
-        }
-
-        $order = oxNew(Order::class);
-        $order->load($this->getEditObjectId());
+        $utilsView = $this->d3GetMockableRegistryObject(UtilsView::class);
 
         try {
-            $sms = oxNew(Sms::class, $messageBody);
-            if ($sms->sendOrderMessage($order)) {
-                $smsCount = $sms->getResponse() ? $sms->getResponse()->getSmsCount() : 0;
-                Registry::getUtilsView()->addErrorToDisplay(
-                    oxNew(successfullySentException::class, $smsCount)
-                );
-            } else {
-                $errorMsg = $sms->getResponse() instanceof ResponseInterface ? $sms->getResponse()->getErrorMessage() : 'no response';
-                /** @var string $format */
-                $format = Registry::getLang()->translateString('D3LM_EXC_MESSAGE_UNEXPECTED_ERR_SEND');
-                Registry::getUtilsView()->addErrorToDisplay(sprintf($format, $errorMsg));
-            }
-        } catch (noRecipientFoundException $e) {
-            Registry::getUtilsView()->addErrorToDisplay($e);
+            $utilsView->addErrorToDisplay($this->sendMessage());
+        } catch (noRecipientFoundException|InvalidArgumentException $e) {
+            $utilsView->addErrorToDisplay($e);
         }
     }
+
+    /**
+     * @return string
+     * @throws InvalidArgumentException
+     */
+    protected function getMessageBody(): string
+    {
+        $messageBody = $this->d3GetMockableRegistryObject(Request::class)
+            ->getRequestEscapedParameter('messagebody');
+
+        if (false === is_string($messageBody) || strlen(trim($messageBody)) <= 1) {
+            throw $this->d3GetMockableOxNewObject(
+                InvalidArgumentException::class,
+                Registry::getLang()->translateString('D3LM_EXC_MESSAGE_NO_LENGTH')
+            );
+        }
+
+        return $messageBody;
+    }
+
+    /**
+     * @return string
+     * @throws noRecipientFoundException
+     */
+    protected function sendMessage(): string
+    {
+        $order = $this->d3GetMockableOxNewObject(Order::class);
+        $order->load($this->getEditObjectId());
+
+        $sms = $this->d3GetMockableOxNewObject(Sms::class, $this->getMessageBody());
+        return $sms->sendOrderMessage($order) ?
+            (string) $this->getSuccessSentMessage($sms) :
+            $this->getUnsuccessfullySentMessage($sms);
+    }
+
+    /**
+     * @param Sms $sms
+     * @return successfullySentException
+     */
+    protected function getSuccessSentMessage(Sms $sms): successfullySentException
+    {
+        $smsCount = $sms->getResponse() ? $sms->getResponse()->getSmsCount() : 0;
+        return $this->d3GetMockableOxNewObject(successfullySentException::class, $smsCount);
+    }
+
+    /**
+     * @param Sms $sms
+     * @return string
+     */
+    protected function getUnsuccessfullySentMessage(Sms $sms): string
+    {
+        $errorMsg = $sms->getResponse() instanceof ResponseInterface ? $sms->getResponse()->getErrorMessage() : 'no response';
+        /** @var string $format */
+        $format = Registry::getLang()->translateString('D3LM_EXC_MESSAGE_UNEXPECTED_ERR_SEND');
+        return sprintf($format, $errorMsg);
+    }
 }
diff --git a/src/tests/.gitignore b/src/tests/.gitignore
new file mode 100644
index 0000000..817366c
--- /dev/null
+++ b/src/tests/.gitignore
@@ -0,0 +1,2 @@
+.phpunit.result.cache
+reports
diff --git a/src/tests/README.md b/src/tests/README.md
new file mode 100644
index 0000000..bb1c169
--- /dev/null
+++ b/src/tests/README.md
@@ -0,0 +1,52 @@
+# D3 Linkmobility4OXID Tests
+
+## Requirements
+
+Both unit and acceptance tests require OXID Testing Library installed.
+See https://github.com/OXID-eSales/testing_library.
+
+### Configuration
+
+Please install the packages listed in the composer.json in "require-dev". Unfortunately Composer does not provide an automatic installation.
+
+Here is an example of Testing Library configuration file `oxideshop/test_config.yml`
+
+```
+# This file is auto-generated during the composer install
+mandatory_parameters:
+    shop_path: /var/www/oxideshop/source
+    shop_tests_path: /var/www/oxideshop/tests
+    partial_module_paths: d3/linkmobility
+optional_parameters:
+    shop_url: null
+    shop_serial: ''
+    enable_varnish: false
+    is_subshop: false
+    install_shop: false
+    remote_server_dir: null
+    shop_setup_path: null
+    restore_shop_after_tests_suite: false
+    test_database_name: null
+    restore_after_acceptance_tests: false
+    restore_after_unit_tests: false
+    tmp_path: /tmp/oxid_test_library/
+    database_restoration_class: DatabaseRestorer
+    activate_all_modules: false
+    run_tests_for_shop: false
+    run_tests_for_modules: true
+    screen_shots_path: null
+    screen_shots_url: null
+    browser_name: firefox
+    selenium_server_ip: 127.0.0.1
+    selenium_server_port: '4444'
+    additional_test_paths: null
+```
+
+## Unit Tests
+
+To execute unit tests run the following:
+
+```
+cd /var/www/oxideshop/
+PHPBIN=/usr/bin/php7.4 ./vendor/bin/runtests
+```
diff --git a/src/tests/additional.inc.php b/src/tests/additional.inc.php
new file mode 100644
index 0000000..c82ae12
--- /dev/null
+++ b/src/tests/additional.inc.php
@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * https://www.d3data.de
+ *
+ * @copyright (C) D3 Data Development (Inh. Thomas Dartsch)
+ * @author    D3 Data Development - Daniel Seifert <support@shopmodule.com>
+ * @link      https://www.oxidmodule.com
+ */
+
+declare(strict_types=1);
+
+namespace D3\Linkmobility4OXID\tests;
+
+use D3\ModCfg\Tests\additional_abstract;
+use OxidEsales\Eshop\Core\Exception\StandardException;
+
+class additional extends additional_abstract
+{
+}
+
+oxNew(additional::class);
diff --git a/src/tests/phpunit.xml b/src/tests/phpunit.xml
new file mode 100644
index 0000000..1bdc0ce
--- /dev/null
+++ b/src/tests/phpunit.xml
@@ -0,0 +1,28 @@
+<phpunit backupGlobals="true"
+         backupStaticAttributes="false"
+         cacheTokens="true"
+         colors="false"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="false"
+         convertWarningsToExceptions="true"
+         forceCoversAnnotation="false"
+         processIsolation="false"
+         stopOnError="false"
+         stopOnFailure="false"
+         stopOnIncomplete="false"
+         stopOnSkipped="false"
+         verbose="false">
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">../Application</directory>
+            <directory suffix=".php">../Modules</directory>
+            <directory suffix=".php">../Setup</directory>
+            <exclude>
+                <directory suffix=".php">../Application/views</directory>
+            </exclude>
+        </whitelist>
+    </filter>
+    <logging>
+        <log type="junit" target="reports/logfile.xml"/>
+    </logging>
+</phpunit>
diff --git a/src/tests/unit/Application/Controller/Admin/AdminOrderTest.php b/src/tests/unit/Application/Controller/Admin/AdminOrderTest.php
new file mode 100644
index 0000000..c1e7843
--- /dev/null
+++ b/src/tests/unit/Application/Controller/Admin/AdminOrderTest.php
@@ -0,0 +1,503 @@
+<?php
+
+/**
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * https://www.d3data.de
+ *
+ * @copyright (C) D3 Data Development (Inh. Thomas Dartsch)
+ * @author    D3 Data Development - Daniel Seifert <support@shopmodule.com>
+ * @link      https://www.oxidmodule.com
+ */
+
+declare(strict_types=1);
+
+namespace D3\Linkmobility4OXID\tests\unit\Application\Controller\Admin;
+
+use D3\Linkmobility4OXID\Application\Controller\Admin\AdminOrder;
+use D3\Linkmobility4OXID\Application\Model\Exceptions\noRecipientFoundException;
+use D3\Linkmobility4OXID\Application\Model\Exceptions\successfullySentException;
+use D3\Linkmobility4OXID\Application\Model\MessageTypes\Sms;
+use D3\Linkmobility4OXID\Application\Model\OrderRecipients;
+use D3\LinkmobilityClient\SMS\Response;
+use D3\LinkmobilityClient\ValueObject\Recipient;
+use D3\TestingTools\Development\CanAccessRestricted;
+use InvalidArgumentException;
+use OxidEsales\Eshop\Application\Model\Order;
+use OxidEsales\Eshop\Core\Registry;
+use OxidEsales\Eshop\Core\Request;
+use OxidEsales\Eshop\Core\UtilsView;
+use OxidEsales\TestingLibrary\UnitTestCase;
+use PHPUnit\Framework\MockObject\MockObject;
+use ReflectionException;
+
+class AdminOrderTest extends UnitTestCase
+{
+    use CanAccessRestricted;
+
+    /**
+     * @test
+     * @return void
+     * @throws ReflectionException
+     * @covers \D3\Linkmobility4OXID\Application\Controller\Admin\AdminOrder::__construct
+     */
+    public function canConstruct()
+    {
+        /** @var Order|MockObject $orderMock */
+        $orderMock = $this->getMockBuilder(Order::class)
+            ->onlyMethods(['load'])
+            ->getMock();
+        $orderMock->method('load')->willReturn(true);
+
+        /** @var Recipient|MockObject $recipientMock */
+        $recipientMock = $this->getMockBuilder(Recipient::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        /** @var AdminOrder|MockObject $sut */
+        $sut = $this->getMockBuilder(AdminOrder::class)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['d3GetMockableOxNewObject', 'getEditObjectId', 'getRecipientFromCurrentOrder'])
+            ->getMock();
+        $sut->method('d3GetMockableOxNewObject')->willReturnCallback(
+            function () use ($orderMock) {
+                $args = func_get_args();
+                switch ($args[0]) {
+                    case Order::class:
+                        return $orderMock;
+                    default:
+                        return call_user_func_array("oxNew", $args);
+                }
+            }
+        );
+        $sut->method('getEditObjectId')->willReturn('editObjId');
+        $sut->method('getRecipientFromCurrentOrder')->willReturn($recipientMock);
+
+        $this->callMethod(
+            $sut,
+            '__construct'
+        );
+
+        $this->assertSame(
+            $orderMock,
+            $this->getValue(
+                $sut,
+                'order'
+            )
+        );
+
+        $this->assertSame(
+            $recipientMock,
+            $this->callMethod(
+                $sut,
+                'getViewDataElement',
+                ['recipient']
+            )
+        );
+    }
+
+    /**
+     * @test
+     * @return void
+     * @throws ReflectionException
+     * @covers \D3\Linkmobility4OXID\Application\Controller\Admin\AdminOrder::getRecipientFromCurrentOrder
+     */
+    public function canGetRecipientFromCurrentOrderPassed()
+    {
+        /** @var Recipient|MockObject $recipientMock */
+        $recipientMock = $this->getMockBuilder(Recipient::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        /** @var OrderRecipients|MockObject $orderRecipientsMock */
+        $orderRecipientsMock = $this->getMockBuilder(OrderRecipients::class)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['getSmsRecipient'])
+            ->getMock();
+        $orderRecipientsMock->method('getSmsRecipient')->willReturn($recipientMock);
+
+        /** @var AdminOrder|MockObject $sut */
+        $sut = $this->getMockBuilder(AdminOrder::class)
+            ->onlyMethods(['d3GetMockableOxNewObject'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $sut->method('d3GetMockableOxNewObject')->willReturnCallback(
+            function () use ($orderRecipientsMock) {
+                $args = func_get_args();
+                switch ($args[0]) {
+                    case OrderRecipients::class:
+                        return $orderRecipientsMock;
+                    default:
+                        return call_user_func_array("oxNew", $args);
+                }
+            }
+        );
+        $this->setValue(
+            $sut,
+            'order',
+            oxNew(Order::class)
+        );
+
+        $this->assertSame(
+            $recipientMock,
+            $this->callMethod(
+                $sut,
+                'getRecipientFromCurrentOrder'
+            )
+        );
+    }
+
+    /**
+     * @test
+     * @return void
+     * @throws ReflectionException
+     * @covers \D3\Linkmobility4OXID\Application\Controller\Admin\AdminOrder::getRecipientFromCurrentOrder
+     */
+    public function canGetRecipientFromCurrentOrderThrowsException()
+    {
+        /** @var UtilsView|MockObject $utilsViewMock */
+        $utilsViewMock = $this->getMockBuilder(UtilsView::class)
+            ->onlyMethods(['addErrorToDisplay'])
+            ->getMock();
+        $utilsViewMock->expects($this->once())->method('addErrorToDisplay');
+
+        /** @var OrderRecipients|MockObject $orderRecipientsMock */
+        $orderRecipientsMock = $this->getMockBuilder(OrderRecipients::class)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['getSmsRecipient'])
+            ->getMock();
+        $orderRecipientsMock->method('getSmsRecipient')->willThrowException(
+            oxNew(noRecipientFoundException::class)
+        );
+
+        /** @var AdminOrder|MockObject $sut */
+        $sut = $this->getMockBuilder(AdminOrder::class)
+            ->onlyMethods(['d3GetMockableOxNewObject', 'd3GetMockableRegistryObject'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $sut->method('d3GetMockableOxNewObject')->willReturnCallback(
+            function () use ($orderRecipientsMock) {
+                $args = func_get_args();
+                switch ($args[0]) {
+                    case OrderRecipients::class:
+                        return $orderRecipientsMock;
+                    default:
+                        return call_user_func_array("oxNew", $args);
+                }
+            }
+        );
+        $sut->method('d3GetMockableRegistryObject')->willReturnCallback(
+            function () use ($utilsViewMock) {
+                $args = func_get_args();
+                switch ($args[0]) {
+                    case UtilsView::class:
+                        return $utilsViewMock;
+                    default:
+                        return Registry::get($args[0]);
+                }
+            }
+        );
+        $this->setValue(
+            $sut,
+            'order',
+            oxNew(Order::class)
+        );
+
+        $this->assertFalse(
+            $this->callMethod(
+                $sut,
+                'getRecipientFromCurrentOrder'
+            )
+        );
+    }
+
+    /**
+     * @test
+     * @param $throwsException
+     * @return void
+     * @throws ReflectionException
+     * @covers       \D3\Linkmobility4OXID\Application\Controller\Admin\AdminOrder::send
+     * @dataProvider canSendDataProvider
+     */
+    public function canSend($throwsException)
+    {
+        /** @var UtilsView|MockObject $utilsViewMock */
+        $utilsViewMock = $this->getMockBuilder(UtilsView::class)
+            ->onlyMethods(['addErrorToDisplay'])
+            ->getMock();
+        $utilsViewMock->expects($this->once())->method('addErrorToDisplay');
+
+        /** @var AdminOrder|MockObject $sut */
+        $sut = $this->getMockBuilder(AdminOrder::class)
+            ->onlyMethods(['d3GetMockableRegistryObject', 'sendMessage'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $sut->method('d3GetMockableRegistryObject')->willReturnCallback(
+            function () use ($utilsViewMock) {
+                $args = func_get_args();
+                switch ($args[0]) {
+                    case UtilsView::class:
+                        return $utilsViewMock;
+                    default:
+                        return Registry::get($args[0]);
+                }
+            }
+        );
+        $sut->method('sendMessage')->will(
+            $throwsException ?
+                $this->throwException(oxNew(noRecipientFoundException::class)) :
+                $this->returnValue('successfully sent message')
+        );
+
+        $this->callMethod(
+            $sut,
+            'send'
+        );
+    }
+
+    /**
+     * @return array
+     */
+    public function canSendDataProvider(): array
+    {
+        return [
+            'can send message'      => [false],
+            'can not send message'  => [true],
+        ];
+    }
+
+    /**
+     * @param $message
+     * @param $expectException
+     * @param $expected
+     * @test
+     * @return void
+     * @throws ReflectionException
+     * @covers \D3\Linkmobility4OXID\Application\Controller\Admin\AdminOrder::getMessageBody
+     * @dataProvider canGetMessageBodyDataProvider
+     */
+    public function canGetMessageBody($message, $expectException, $expected)
+    {
+        /** @var Request|MockObject $requestMock */
+        $requestMock = $this->getMockBuilder(Request::class)
+            ->onlyMethods(['getRequestEscapedParameter'])
+            ->getMock();
+        $requestMock->method('getRequestEscapedParameter')->willReturn($message);
+
+        /** @var Request|MockObject $sut */
+        $sut = $this->getMockBuilder(AdminOrder::class)
+            ->onlyMethods(['d3GetMockableRegistryObject'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $sut->method('d3GetMockableRegistryObject')->willReturnCallback(
+            function () use ($requestMock) {
+                $args = func_get_args();
+                switch ($args[0]) {
+                    case Request::class:
+                        return $requestMock;
+                    default:
+                        return Registry::get($args[0]);
+                }
+            }
+        );
+
+        if ($expectException) {
+            $this->expectException(InvalidArgumentException::class);
+        }
+
+        $this->assertSame(
+            $expected,
+            $this->callMethod(
+                $sut,
+                'getMessageBody'
+            )
+        );
+    }
+
+    /**
+     * @return array[]
+     */
+    public function canGetMessageBodyDataProvider(): array
+    {
+        return [
+            'message not string'        => [[], true, ''],
+            'message empty string'      => ['', true, ''],
+            'message whitespace string' => ['  ', true, ''],
+            'message right string'      => ['messagefixture', false, 'messagefixture'],
+        ];
+    }
+
+    /**
+     * @test
+     * @param $canSendOrderMessage
+     * @return void
+     * @throws ReflectionException
+     * @covers \D3\Linkmobility4OXID\Application\Controller\Admin\AdminOrder::sendMessage
+     * @dataProvider canSendMessageDataProvider
+     */
+    public function canSendMessage($canSendOrderMessage)
+    {
+        /** @var Order|MockObject $orderMock */
+        $orderMock = $this->getMockBuilder(Order::class)
+            ->onlyMethods(['load'])
+            ->getMock();
+        $orderMock->method('load')->willReturn(true);
+
+        /** @var Sms|MockObject $smsMock */
+        $smsMock = $this->getMockBuilder(Sms::class)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['sendOrderMessage'])
+            ->getMock();
+        $smsMock->expects($this->once())->method('sendOrderMessage')->willReturn($canSendOrderMessage);
+
+        /** @var AdminOrder|MockObject $sut */
+        $sut = $this->getMockBuilder(AdminOrder::class)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['d3GetMockableOxNewObject', 'getMessageBody', 'getSuccessSentMessage', 'getUnsuccessfullySentMessage'])
+            ->getMock();
+        $sut->method('d3GetMockableOxNewObject')->willReturnCallback(
+            function () use ($orderMock, $smsMock) {
+                $args = func_get_args();
+                switch ($args[0]) {
+                    case Order::class:
+                        return $orderMock;
+                    case Sms::class:
+                        return $smsMock;
+                    default:
+                        return call_user_func_array("oxNew", $args);
+                }
+            }
+        );
+        $sut->method('getMessageBody')->willReturn('messageBodyFixture');
+        $sut->expects($this->exactly((int) $canSendOrderMessage))->method('getSuccessSentMessage')
+            ->willReturn(oxNew(successfullySentException::class, 'expectedReturn'));
+        $sut->expects($this->exactly((int) !$canSendOrderMessage))->method('getUnsuccessfullySentMessage')
+            ->willReturn('expectedReturn');
+
+        $this->assertIsString(
+            $this->callMethod(
+                $sut,
+                'sendMessage'
+            )
+        );
+    }
+
+    /**
+     * @return array
+     */
+    public function canSendMessageDataProvider(): array
+    {
+        return [
+            'send order message'        => [true],
+            'dont send order message'   => [false]
+        ];
+    }
+
+    /**
+     * @test
+     * @param $hasResponse
+     * @return void
+     * @throws ReflectionException
+     * @covers \D3\Linkmobility4OXID\Application\Controller\Admin\AdminOrder::getSuccessSentMessage
+     * @dataProvider canGetSuccessSentMessageDataProvider
+     */
+    public function canGetSuccessSentMessage($hasResponse)
+    {
+        /** @var successfullySentException|MockObject $successfullySendExceptionMock */
+        $successfullySendExceptionMock = $this->getMockBuilder(successfullySentException::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        /** @var Response|MockObject $resonseMock */
+        $resonseMock = $this->getMockBuilder(Response::class)
+            ->onlyMethods(['getSmsCount'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $resonseMock->expects($hasResponse ? $this->once() : $this->never())->method('getSmsCount')
+            ->willReturn(20);
+
+        /** @var Sms|MockObject $smsMock */
+        $smsMock = $this->getMockBuilder(Sms::class)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['getResponse'])
+            ->getMock();
+        $smsMock->method('getResponse')->willReturn($hasResponse ? $resonseMock : null);
+
+        /** @var AdminOrder|MockObject $sut */
+        $sut = $this->getMockBuilder(AdminOrder::class)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['d3GetMockableOxNewObject'])
+            ->getMock();
+        $sut->method('d3GetMockableOxNewObject')->willReturnCallback(
+            function () use ($successfullySendExceptionMock) {
+                $args = func_get_args();
+                switch ($args[0]) {
+                    case successfullySentException::class:
+                        return $successfullySendExceptionMock;
+                    default:
+                        return call_user_func_array("oxNew", $args);
+                }
+            }
+        );
+
+        $this->assertSame(
+            $successfullySendExceptionMock,
+            $this->callMethod(
+                $sut,
+                'getSuccessSentMessage',
+                [$smsMock]
+            )
+        );
+    }
+
+    /**
+     * @return array
+     */
+    public function canGetSuccessSentMessageDataProvider(): array
+    {
+        return [
+            'has response'      => [true],
+            'has no response'   => [false],
+        ];
+    }
+
+    /**
+     * @test
+     * @param $hasResponse
+     * @return void
+     * @throws ReflectionException
+     * @covers \D3\Linkmobility4OXID\Application\Controller\Admin\AdminOrder::getUnsuccessfullySentMessage
+     * @dataProvider canGetSuccessSentMessageDataProvider
+     */
+    public function canGetUnsuccessfullySentMessage($hasResponse)
+    {
+        /** @var Response|MockObject $resonseMock */
+        $resonseMock = $this->getMockBuilder(Response::class)
+            ->onlyMethods(['getErrorMessage'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $resonseMock->expects($hasResponse ? $this->once() : $this->never())->method('getErrorMessage')
+            ->willReturn('errorMessage');
+
+        /** @var Sms|MockObject $smsMock */
+        $smsMock = $this->getMockBuilder(Sms::class)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['getResponse'])
+            ->getMock();
+        $smsMock->method('getResponse')->willReturn($hasResponse ? $resonseMock : null);
+
+        /** @var AdminOrder|MockObject $sut */
+        $sut = $this->getMockBuilder(AdminOrder::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $this->assertIsString(
+            $this->callMethod(
+                $sut,
+                'getUnsuccessfullySentMessage',
+                [$smsMock]
+            )
+        );
+    }
+}
\ No newline at end of file