diff --git a/Tests/Response/AbstractResponse.php b/Tests/Response/AbstractResponse.php
new file mode 100644
index 0000000..4fcf196
--- /dev/null
+++ b/Tests/Response/AbstractResponse.php
@@ -0,0 +1,216 @@
+<?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\Response;
+
+use D3\LinkmobilityClient\Response\Response;
+use D3\LinkmobilityClient\Tests\ApiTestCase;
+use PHPUnit\Framework\MockObject\MockObject;
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+use ReflectionException;
+
+abstract class AbstractResponse extends ApiTestCase
+{
+    protected $testClassName;
+
+    /**
+     * @test
+     * @throws ReflectionException
+     */
+    public function testConstruct()
+    {
+        /** @var StreamInterface|MockObject $streamMock */
+        $streamMock = $this->getMockBuilder(StreamInterface::class)
+            ->onlyMethods(['getContents', '__toString', 'close', 'detach', 'getSize', 'tell', 'eof', 'isSeekable',
+                'seek', 'rewind', 'isWritable', 'write', 'isReadable', 'read', 'getMetadata'])
+            ->getMock();
+        $streamMock->expects($this->atLeastOnce())->method('getContents')->willReturn(
+            '{
+                "contentCategory": "informational",
+                "messageContent": "fixture",
+                "senderAddressType": "international"
+            }'
+        );
+
+        /** @var ResponseInterface|MockObject $rawResponseMock */
+        $rawResponseMock = $this->getMockBuilder(ResponseInterface::class)
+            ->onlyMethods([
+                'getBody', 'getStatusCode', 'withStatus', 'getReasonphrase', 'getProtocolVersion',
+                'withProtocolVersion', 'getHeaders', 'hasHeader', 'getHeader', 'getHeaderLine',
+                'withHeader', 'withAddedHeader', 'withoutHeader', 'withBody'])
+            ->getMock();
+        $rawResponseMock->method('getBody')->willReturn($streamMock);
+
+        /** @var Response $response */
+        $response = new $this->testClassName($rawResponseMock);
+
+        $this->assertSame(
+            $rawResponseMock,
+            $this->callMethod(
+                $response,
+                'getRawResponse'
+            )
+        );
+
+        $this->assertSame(
+            [
+                "contentCategory" => "informational",
+                "messageContent" => "fixture",
+                "senderAddressType" => "international",
+                ]
+            ,
+            $this->callMethod(
+                $response,
+                'getContent'
+            )
+        );
+    }
+
+    /**
+     * @throws ReflectionException
+     */
+    protected function checkProperties($expected, $propertyName, $methodName)
+    {
+        /** @var Response $response */
+        $responseMock = $this->getMockBuilder($this->testClassName)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['getContent'])
+            ->getMock();
+        $responseMock->method('getContent')->willReturn([$propertyName   => $expected]);
+
+        $this->assertSame(
+            $expected,
+            $this->callMethod(
+                $responseMock,
+                $methodName
+            )
+        );
+    }
+
+    /**
+     * @test
+     * @throws ReflectionException
+     */
+    public function testGetInternalStatus()
+    {
+        $this->checkProperties(200, 'statusCode', 'getInternalStatus');
+    }
+
+    /**
+     * @test
+     * @throws ReflectionException
+     */
+    public function testGetStatusMessage()
+    {
+        $this->checkProperties('statusMessage', 'statusMessage', 'getStatusMessage');
+    }
+
+    /**
+     * @test
+     * @throws ReflectionException
+     */
+    public function testGetTransferId()
+    {
+        $this->checkProperties('transferId', 'transferId', 'getTransferId');
+    }
+
+    /**
+     * @test
+     * @throws ReflectionException
+     */
+    public function testGetSmsCount()
+    {
+        $this->checkProperties(5, 'smsCount', 'getSmsCount');
+    }
+
+    /**
+     * @test
+     * @param $statusCode
+     * @param $expected
+     *
+     * @throws ReflectionException
+     * @dataProvider isSuccessfulDataProvider
+     */
+    public function testIsSuccessful($statusCode, $expected)
+    {
+        /** @var Response|MockObject $responseMock */
+        $responseMock = $this->getMockBuilder($this->testClassName)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['getInternalStatus'])
+            ->getMock();
+        $responseMock->method('getInternalStatus')->willReturn($statusCode);
+
+        $this->assertSame(
+            $expected,
+            $this->callMethod(
+                $responseMock,
+                'isSuccessful'
+            )
+        );
+    }
+
+    /**
+     * @return array[]
+     */
+    public function isSuccessfulDataProvider(): array
+    {
+        return [
+            'below 2000'    => [1999, false],
+            'between 2000'  => [2000, true],
+            'above 3000'    => [3000, false],
+        ];
+    }
+
+    /**
+     * @test
+     * @param $successful
+     * @param $expected
+     *
+     * @throws ReflectionException
+     * @dataProvider getErrorMessageDataProvider
+     */
+    public function testGetErrorMessage($successful, $expected)
+    {
+        /** @var Response|MockObject $responseMock */
+        $responseMock = $this->getMockBuilder($this->testClassName)
+            ->disableOriginalConstructor()
+            ->onlyMethods(['isSuccessful', 'getStatusMessage'])
+            ->getMock();
+        $responseMock->method('isSuccessful')->willReturn($successful);
+        $responseMock->method('getStatusMessage')->willReturn('fixtureMessage');
+
+        $this->assertSame(
+            $expected,
+            $this->callMethod(
+                $responseMock,
+                'getErrorMessage'
+            )
+        );
+    }
+
+    /**
+     * @return array[]
+     */
+    public function getErrorMessageDataProvider(): array
+    {
+        return [
+            'successful'    => [true, ''],
+            'not successful'=> [false, 'fixtureMessage']
+        ];
+    }
+}
\ No newline at end of file
diff --git a/Tests/SMS/ResponseTest.php b/Tests/SMS/ResponseTest.php
new file mode 100644
index 0000000..c36966d
--- /dev/null
+++ b/Tests/SMS/ResponseTest.php
@@ -0,0 +1,26 @@
+<?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\SMS\Response;
+use D3\LinkmobilityClient\Tests\Response\AbstractResponse;
+
+class ResponseTest extends AbstractResponse
+{
+    protected $testClassName = Response::class;
+}
\ No newline at end of file
diff --git a/src/SMS/SmsRequestInterface.php b/src/SMS/SmsRequestInterface.php
index 02bce86..9241587 100644
--- a/src/SMS/SmsRequestInterface.php
+++ b/src/SMS/SmsRequestInterface.php
@@ -15,4 +15,6 @@
 
 namespace D3\LinkmobilityClient\SMS;
 
-interface SmsRequestInterface {}
\ No newline at end of file
+use D3\LinkmobilityClient\Request\RequestInterface;
+
+interface SmsRequestInterface extends RequestInterface {}
\ No newline at end of file