diff --git a/Tests/Request/AbstractRequest.php b/Tests/Request/AbstractRequest.php
index 63bbd57..9bee7c9 100644
--- a/Tests/Request/AbstractRequest.php
+++ b/Tests/Request/AbstractRequest.php
@@ -89,13 +89,10 @@ abstract class AbstractRequest extends ApiTestCase
         $requestMock->expects($this->atLeastOnce())->method('setMessage')->with($this->equalTo($messageMock))->willReturnSelf();
         $requestMock->expects($this->atLeastOnce())->method('setClient')->with($this->equalTo($clientMock))->willReturnSelf();
 
-        $this->assertInstanceOf(
-            Request::class,
-            $this->callMethod(
-                $requestMock,
-                '__construct',
-                [$messageMock, $clientMock]
-            )
+        $this->callMethod(
+            $requestMock,
+            '__construct',
+            [$messageMock, $clientMock]
         );
     }
 
diff --git a/Tests/ValueObject/RecipientTest.php b/Tests/ValueObject/RecipientTest.php
index 6be8e9b..9dcb9f0 100644
--- a/Tests/ValueObject/RecipientTest.php
+++ b/Tests/ValueObject/RecipientTest.php
@@ -149,7 +149,7 @@ class RecipientTest extends ApiTestCase
     }
 
     /**
-     * @return string[][]
+     * @return array[]
      */
     public function constructInvalidDataProvider(): array
     {
diff --git a/Tests/ValueObject/SenderTest.php b/Tests/ValueObject/SenderTest.php
index b523fc8..6cdbf93 100644
--- a/Tests/ValueObject/SenderTest.php
+++ b/Tests/ValueObject/SenderTest.php
@@ -158,7 +158,7 @@ class SenderTest extends ApiTestCase
     }
 
     /**
-     * @return string[][]
+     * @return array[]
      */
     public function constructInvalidDataProvider(): array
     {
diff --git a/Tests/ValueObject/SmsBinaryMessageTest.php b/Tests/ValueObject/SmsBinaryMessageTest.php
index 8772dd8..7b01e1c 100644
--- a/Tests/ValueObject/SmsBinaryMessageTest.php
+++ b/Tests/ValueObject/SmsBinaryMessageTest.php
@@ -22,7 +22,7 @@ use Phlib\SmsLength\SmsLength;
 use PHPUnit\Framework\MockObject\MockObject;
 use ReflectionException;
 
-class SmsBinaryMessageTest extends ApiTestCase
+class SmsBinaryMessageTest extends SmsMessageAbstractTest
 {
     /** @var SmsBinaryMessage */
     public $message;
@@ -39,21 +39,12 @@ class SmsBinaryMessageTest extends ApiTestCase
         $this->message = new SmsBinaryMessage($this->messageFixture);
     }
 
-    /**
-     * @return void
-     */
-    public function tearDown(): void
-    {
-        parent::tearDown();
-
-        unset($this->message);
-    }
-
     /**
      * @test
      * @return void
      * @throws ReflectionException
      * @covers \D3\LinkmobilityClient\ValueObject\SmsBinaryMessage::__construct
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsMessageAbstract::__construct
      */
     public function testConstructValid()
     {
@@ -91,6 +82,7 @@ class SmsBinaryMessageTest extends ApiTestCase
      * @throws ReflectionException
      * @dataProvider constructInvalidDataProvider
      * @covers \D3\LinkmobilityClient\ValueObject\SmsBinaryMessage::__construct
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsMessageAbstract::__construct
      */
     public function testConstructInvalid($binaryMessage, $valid, $expectedException)
     {
@@ -124,37 +116,11 @@ class SmsBinaryMessageTest extends ApiTestCase
         );
     }
 
-    /**
-     * @return string[][]
-     */
-    public function constructInvalidDataProvider(): array
-    {
-        return [
-            'empty message'          => ['', true, InvalidArgumentException::class],
-            'invalid sms message'    => ['abc', false, \Phlib\SmsLength\Exception\InvalidArgumentException::class],
-        ];
-    }
-
-    /**
-     * @test
-     * @throws ReflectionException
-     * @covers \D3\LinkmobilityClient\ValueObject\SmsBinaryMessage::getSmsLength
-     */
-    public function testGetSmsLengthInstance()
-    {
-        $this->assertInstanceOf(
-            SmsLength::class,
-            $this->callMethod(
-                $this->message,
-                'getSmsLength'
-            )
-        );
-    }
-
     /**
      * @test
      * @throws ReflectionException
      * @covers \D3\LinkmobilityClient\ValueObject\SmsBinaryMessage::chunkCount
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsMessageAbstract::chunkCount
      */
     public function testGetChunkCount()
     {
@@ -170,9 +136,9 @@ class SmsBinaryMessageTest extends ApiTestCase
 
         /** @var SmsBinaryMessage|MockObject $message */
         $message = $this->getMockBuilder(SmsBinaryMessage::class)
-                        ->onlyMethods(['getSmsLength'])
-                        ->disableOriginalConstructor()
-                        ->getMock();
+            ->onlyMethods(['getSmsLength'])
+            ->disableOriginalConstructor()
+            ->getMock();
         $message->method('getSmsLength')->willReturn($smsLengthMock);
 
         $this->assertSame(
@@ -188,6 +154,7 @@ class SmsBinaryMessageTest extends ApiTestCase
      * @test
      * @throws ReflectionException
      * @covers \D3\LinkmobilityClient\ValueObject\SmsBinaryMessage::length
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsMessageAbstract::length
      */
     public function testGetSize()
     {
diff --git a/Tests/ValueObject/SmsMessageAbstractTest.php b/Tests/ValueObject/SmsMessageAbstractTest.php
new file mode 100644
index 0000000..e5b4946
--- /dev/null
+++ b/Tests/ValueObject/SmsMessageAbstractTest.php
@@ -0,0 +1,66 @@
+<?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\LinkmobilityClient\Tests\ValueObject;
+
+use Assert\InvalidArgumentException;
+use D3\LinkmobilityClient\Tests\ApiTestCase;
+use D3\LinkmobilityClient\ValueObject\SmsBinaryMessage;
+use Phlib\SmsLength\SmsLength;
+use PHPUnit\Framework\MockObject\MockObject;
+use ReflectionException;
+
+abstract class SmsMessageAbstractTest extends ApiTestCase
+{
+    public $message;
+
+    /**
+     * @return void
+     */
+    public function tearDown(): void
+    {
+        parent::tearDown();
+
+        unset($this->message);
+    }
+
+    /**
+     * @return array[]
+     */
+    public function constructInvalidDataProvider(): array
+    {
+        return [
+            'empty message'          => ['', true, InvalidArgumentException::class],
+            'invalid sms message'    => ['abc', false, \Phlib\SmsLength\Exception\InvalidArgumentException::class],
+        ];
+    }
+
+    /**
+     * @test
+     * @throws ReflectionException
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsBinaryMessage::getSmsLength
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsTextMessage::getSmsLength
+     */
+    public function testGetSmsLengthInstance()
+    {
+        $this->assertInstanceOf(
+            SmsLength::class,
+            $this->callMethod(
+                $this->message,
+                'getSmsLength'
+            )
+        );
+    }
+}
diff --git a/Tests/ValueObject/SmsTextMessageTest.php b/Tests/ValueObject/SmsTextMessageTest.php
index 86a2ca7..5ea881d 100644
--- a/Tests/ValueObject/SmsTextMessageTest.php
+++ b/Tests/ValueObject/SmsTextMessageTest.php
@@ -21,7 +21,7 @@ use Phlib\SmsLength\SmsLength;
 use PHPUnit\Framework\MockObject\MockObject;
 use ReflectionException;
 
-class SmsTextMessageTest extends SmsBinaryMessageTest
+class SmsTextMessageTest extends SmsMessageAbstractTest
 {
     /** @var SmsTextMessage */
     public $message;
@@ -43,6 +43,7 @@ class SmsTextMessageTest extends SmsBinaryMessageTest
      * @return void
      * @throws ReflectionException
      * @covers \D3\LinkmobilityClient\ValueObject\SmsTextMessage::__construct
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsMessageAbstract::__construct
      */
     public function testConstructValid()
     {
@@ -80,6 +81,7 @@ class SmsTextMessageTest extends SmsBinaryMessageTest
      * @throws ReflectionException
      * @dataProvider constructInvalidDataProvider
      * @covers \D3\LinkmobilityClient\ValueObject\SmsTextMessage::__construct
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsMessageAbstract::__construct
      */
     public function testConstructInvalid($binaryMessage, $valid, $expectedException)
     {
@@ -112,4 +114,104 @@ class SmsTextMessageTest extends SmsBinaryMessageTest
             )
         );
     }
+
+    /**
+     * @test
+     * @throws ReflectionException
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsTextMessage::chunkCount
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsMessageAbstract::chunkCount
+     */
+    public function testGetChunkCount()
+    {
+        $expected = 2;
+
+        /** @var SmsLength|MockObject $smsLengthMock */
+        $smsLengthMock = $this->getMockBuilder(SmsLength::class)
+            ->onlyMethods(['getMessageCount', 'validate'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $smsLengthMock->expects($this->once())->method('getMessageCount')->willReturn($expected);
+        $smsLengthMock->method('validate')->willReturn(true);
+
+        /** @var SmsTextMessage|MockObject $message */
+        $message = $this->getMockBuilder(SmsTextMessage::class)
+            ->onlyMethods(['getSmsLength'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $message->method('getSmsLength')->willReturn($smsLengthMock);
+
+        $this->assertSame(
+            $expected,
+            $this->callMethod(
+                $message,
+                'chunkCount'
+            )
+        );
+    }
+
+    /**
+     * @test
+     * @throws ReflectionException
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsTextMessage::length
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsMessageAbstract::length
+     */
+    public function testGetSize()
+    {
+        $expected = 55;
+
+        /** @var SmsLength|MockObject $smsLengthMock */
+        $smsLengthMock = $this->getMockBuilder(SmsLength::class)
+            ->onlyMethods(['getSize', 'validate'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $smsLengthMock->expects($this->once())->method('getSize')->willReturn($expected);
+        $smsLengthMock->method('validate')->willReturn(true);
+
+        /** @var SmsTextMessage|MockObject $message */
+        $message = $this->getMockBuilder(SmsTextMessage::class)
+            ->onlyMethods(['getSmsLength'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $message->method('getSmsLength')->willReturn($smsLengthMock);
+
+        $this->assertSame(
+            $expected,
+            $this->callMethod(
+                $message,
+                'length'
+            )
+        );
+    }
+
+    /**
+     * @test
+     * @throws ReflectionException
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsTextMessage::getMessageContent
+     * @covers \D3\LinkmobilityClient\ValueObject\SmsMessageAbstract::getMessageContent
+     */
+    public function testGetMessageContent()
+    {
+        /** @var SmsLength|MockObject $smsLengthMock */
+        $smsLengthMock = $this->getMockBuilder(SmsLength::class)
+            ->onlyMethods(['validate'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $smsLengthMock->method('validate')->willReturn(true);
+
+        /** @var SmsTextMessage|MockObject $message */
+        $message = $this->getMockBuilder(SmsTextMessage::class)
+            ->onlyMethods(['getSmsLength'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $message->method('getSmsLength')->willReturn($smsLengthMock);
+        $message->__construct($this->messageFixture);
+
+        $this->assertSame(
+            'testMessage',
+            $this->callMethod(
+                $message,
+                'getMessageContent'
+            )
+        );
+    }
 }
diff --git a/composer.json b/composer.json
index 2fbdb5e..81194aa 100644
--- a/composer.json
+++ b/composer.json
@@ -45,6 +45,6 @@
         "test": "./vendor/bin/phpunit",
         "check-style": "./vendor/bin/php-cs-fixer fix --verbose --dry-run",
         "fix-style": "./vendor/bin/php-cs-fixer fix --verbose",
-        "check-code": "./vendor/bin/phpstan -c phpstan.neon --no-progress --ansi"
+        "check-code": "./vendor/bin/phpstan analyse -c phpstan.neon --no-progress --ansi"
     }
 }
diff --git a/phpstan.neon b/phpstan.neon
index 6f108c7..31ef191 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -2,5 +2,5 @@ parameters:
     paths:
         - src
         - Tests
-    level: 2
+    level: 5
     phpVersion: 70300
diff --git a/src/Request/Request.php b/src/Request/Request.php
index 1662c5f..4f12ffd 100644
--- a/src/Request/Request.php
+++ b/src/Request/Request.php
@@ -107,7 +107,7 @@ abstract class Request implements RequestInterface
     private $test = false;
 
     /**
-     * @var bool
+     * @var int
      */
     private $maxSmsPerMessage = 0;
 
@@ -119,8 +119,6 @@ abstract class Request implements RequestInterface
         $this->recipientsList = new RecipientsList($client);
         $this->setMessage($message);
         $this->setClient($client);
-
-        return $this;
     }
 
     /**
@@ -207,11 +205,11 @@ abstract class Request implements RequestInterface
     }
 
     /**
-     * @param StringValueObject $message
+     * @param SmsMessageInterface $message
      *
      * @return $this
      */
-    public function setMessage(StringValueObject $message): Request
+    public function setMessage(SmsMessageInterface $message): Request
     {
         $this->message = $message;