diff --git a/Tests/SMS/RequestFactoryTest.php b/Tests/SMS/RequestFactoryTest.php
new file mode 100644
index 0000000..6c2e5d3
--- /dev/null
+++ b/Tests/SMS/RequestFactoryTest.php
@@ -0,0 +1,135 @@
+<?php
+
+/**
+ * This Software is the property of Data Development and is protected
+ * by copyright law - it is NOT Freeware.
+ * Any unauthorized use of this software without a valid license
+ * is a violation of the license agreement and will be prosecuted by
+ * civil and criminal law.
+ * http://www.shopmodule.com
+ *
+ * @copyright (C) D3 Data Development (Inh. Thomas Dartsch)
+ * @author        D3 Data Development - Daniel Seifert <support@shopmodule.com>
+ * @link          http://www.oxidmodule.com
+ */
+
+declare( strict_types = 1 );
+
+namespace D3\LinkmobilityClient\Tests\SMS;
+
+use D3\LinkmobilityClient\Client;
+use D3\LinkmobilityClient\SMS\BinaryRequest;
+use D3\LinkmobilityClient\SMS\RequestFactory;
+use D3\LinkmobilityClient\SMS\TextRequest;
+use D3\LinkmobilityClient\Tests\ApiTestCase;
+use Phlib\SmsLength\SmsLength;
+use PHPUnit\Framework\MockObject\MockObject;
+use ReflectionException;
+
+class RequestFactoryTest extends ApiTestCase
+{
+    /**
+     * @test
+     * @return void
+     * @throws ReflectionException
+     */
+    public function testConstruct()
+    {
+        $message = 'fixtureMessage';
+
+        /** @var Client|MockObject $clientMock */
+        $clientMock = $this->getMockBuilder(Client::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $requestFactory = new RequestFactory($message, $clientMock);
+
+        $this->assertSame(
+            $message,
+            $this->getValue($requestFactory, 'message')
+        );
+        $this->assertSame(
+            $clientMock,
+            $this->getValue($requestFactory, 'client')
+        );
+    }
+
+    /**
+     * @test
+     * @param $encoding
+     * @param $expectedClass
+     * @return void
+     * @throws ReflectionException
+     * @dataProvider getTextSmsRequestDataProvider
+     */
+    public function testGetTextSmsRequest($encoding, $expectedClass)
+    {
+        $message = 'fixtureMessage';
+
+        /** @var Client|MockObject $clientMock */
+        $clientMock = $this->getMockBuilder(Client::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        /** @var SmsLength|MockObject $smsLengthMock */
+        $smsLengthMock = $this->getMockBuilder(SmsLength::class)
+            ->onlyMethods(['getEncoding'])
+            ->disableOriginalConstructor()
+            ->getMock();
+        $smsLengthMock->method('getEncoding')->willReturn($encoding);
+
+        /** @var RequestFactory|MockObject $requestFactoryMock */
+        $requestFactoryMock = $this->getMockBuilder(RequestFactory::class)
+            ->setConstructorArgs([$message, $clientMock])
+            ->onlyMethods(['getSmsLength'])
+            ->getMock();
+        $requestFactoryMock->method('getSmsLength')->willReturn($smsLengthMock);
+
+        $this->assertInstanceOf(
+            $expectedClass,
+            $this->callMethod(
+                $requestFactoryMock,
+                'getSmsRequest'
+            )
+        );
+    }
+
+    /**
+     * @return array[]
+     */
+    public function getTextSmsRequestDataProvider(): array
+    {
+        return [
+            'binary'    => [RequestFactory::GSM_UCS2, BinaryRequest::class],
+            'ascii'     => [RequestFactory::GSM_7BIT, TextRequest::class]
+        ];
+    }
+
+    /**
+     * @test
+     * @return void
+     * @throws ReflectionException
+     */
+    public function testGetSmsLengthInstance()
+    {
+        $message = 'fixtureMessage';
+
+        /** @var Client|MockObject $clientMock */
+        $clientMock = $this->getMockBuilder(Client::class)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        /** @var RequestFactory|MockObject $requestFactoryMock */
+        $requestFactoryMock = $this->getMockBuilder(RequestFactory::class)
+            ->setConstructorArgs([$message, $clientMock])
+            ->getMock();
+
+        $this->assertInstanceOf(
+            SmsLength::class,
+            $this->callMethod(
+                $requestFactoryMock,
+                'getSmsLength'
+            )
+        );
+    }
+}
\ No newline at end of file
diff --git a/src/SMS/RequestFactory.php b/src/SMS/RequestFactory.php
index d6d63d8..59ded4f 100644
--- a/src/SMS/RequestFactory.php
+++ b/src/SMS/RequestFactory.php
@@ -48,8 +48,7 @@ class RequestFactory
      */
     public function getSmsRequest() : SmsRequestInterface
     {
-        $smsLength = new SmsLength($this->message);
-        if ($smsLength->getEncoding() === self::GSM_7BIT) {
+        if ($this->getSmsLength()->getEncoding() === self::GSM_7BIT) {
             $message = new SmsTextMessage($this->message);
             return new TextRequest($message, $this->client);
         }
@@ -57,4 +56,12 @@ class RequestFactory
         $message = new SmsBinaryMessage($this->message);
         return new BinaryRequest($message, $this->client);
     }
+
+    /**
+     * @return SmsLength
+     */
+    protected function getSmsLength(): SmsLength
+    {
+        return new SmsLength($this->message);
+    }
 }
\ No newline at end of file