diff --git a/Tests/ClientTest.php b/Tests/ClientTest.php
index 63b5c9a..6e98998 100644
--- a/Tests/ClientTest.php
+++ b/Tests/ClientTest.php
@@ -255,4 +255,20 @@ class ClientTest extends ApiTestCase
             'NOK status' => [false],
         ];
     }
+
+    /**
+     * @test
+     * @return void
+     * @throws ReflectionException
+     */
+    public function testGetLoggerHandler()
+    {
+        $this->assertInstanceOf(
+            LoggerHandler::class,
+            $this->callMethod(
+                $this->api,
+                'getLoggerHandler'
+            )
+        );
+    }
 }
diff --git a/Tests/Request/AbstractRequest.php b/Tests/Request/AbstractRequest.php
index a669164..47055f9 100644
--- a/Tests/Request/AbstractRequest.php
+++ b/Tests/Request/AbstractRequest.php
@@ -620,4 +620,31 @@ abstract class AbstractRequest extends ApiTestCase
 
         $this->checkGetterSetter($clientMock, 'setClient', 'getClient');
     }
+
+    /**
+     * @test
+     * @return void
+     * @throws ReflectionException
+     */
+    public function testGetResponseClass()
+    {
+        $className = $this->callMethod(
+            $this->request,
+            'getResponseClass'
+        );
+
+        $this->assertIsString(
+            $className
+        );
+
+        /** @var \D3\LinkmobilityClient\Response\ResponseInterface|MockObject $responseMock */
+        $responseMock = $this->getMockBuilder($className)
+            ->disableOriginalConstructor()
+            ->getMock();
+
+        $this->assertInstanceOf(
+            \D3\LinkmobilityClient\Response\ResponseInterface::class,
+            $responseMock
+        );
+    }
 }
diff --git a/Tests/Response/AbstractResponse.php b/Tests/Response/AbstractResponse.php
index b4c2028..0f8d21b 100644
--- a/Tests/Response/AbstractResponse.php
+++ b/Tests/Response/AbstractResponse.php
@@ -117,6 +117,15 @@ abstract class AbstractResponse extends ApiTestCase
         $this->checkProperties('statusMessage', 'statusMessage', 'getStatusMessage');
     }
 
+    /**
+     * @test
+     * @throws ReflectionException
+     */
+    public function testGetClientMessageId()
+    {
+        $this->checkProperties('clientMessageId', 'clientMessageId', 'getClientMessageId');
+    }
+
     /**
      * @test
      * @throws ReflectionException
diff --git a/Tests/ValueObject/RecipientTest.php b/Tests/ValueObject/RecipientTest.php
index ffe8ddc..9edfab5 100644
--- a/Tests/ValueObject/RecipientTest.php
+++ b/Tests/ValueObject/RecipientTest.php
@@ -143,9 +143,13 @@ class RecipientTest extends ApiTestCase
      */
     public function constructInvalidDataProvider(): array
     {
+        $phoneUtil = PhoneNumberUtil::getInstance();
+        $example = $phoneUtil->getExampleNumberForType($this->phoneCountryFixture, PhoneNumberType::MOBILE);
+        $phoneNumberFixture = $phoneUtil->format($example,  PhoneNumberFormat::NATIONAL);
+
         return [
             'empty number'          => ['', 'DE', true, InvalidArgumentException::class],
-            'invalid country code'  => [$this->phoneNumberFixture, 'DEX', true, InvalidArgumentException::class],
+            'invalid country code'  => [$phoneNumberFixture, 'DEX', true, InvalidArgumentException::class],
             'unparsable'            => ['abc', 'DE', true, NumberParseException::class],
             'invalid number'        => ['abc', 'DE', false, NumberParseException::class]
         ];
diff --git a/Tests/ValueObject/SenderTest.php b/Tests/ValueObject/SenderTest.php
index 4d702fb..6a81f1e 100644
--- a/Tests/ValueObject/SenderTest.php
+++ b/Tests/ValueObject/SenderTest.php
@@ -50,7 +50,6 @@ class SenderTest extends ApiTestCase
 
         $this->sender = new Sender($this->phoneNumberFixture, $this->phoneCountryFixture);
 
-
     }
 
     /**
@@ -140,9 +139,13 @@ class SenderTest extends ApiTestCase
      */
     public function constructInvalidDataProvider(): array
     {
+        $phoneUtil = PhoneNumberUtil::getInstance();
+        $example = $phoneUtil->getExampleNumberForType($this->phoneCountryFixture, PhoneNumberType::MOBILE);
+        $phoneNumberFixture = $phoneUtil->format($example,  PhoneNumberFormat::NATIONAL);
+
         return [
             'empty number'          => ['', 'DE', true, InvalidArgumentException::class],
-            'invalid country code'  => [$this->phoneNumberFixture, 'DEX', true, InvalidArgumentException::class],
+            'invalid country code'  => [$phoneNumberFixture, 'DEX', true, InvalidArgumentException::class],
             'unparsable'            => ['abc', 'DE', true, NumberParseException::class],
             'invalid number'        => ['abc', 'DE', false, NumberParseException::class]
         ];