thirdparty docgen normalizer: fix return type for telephone

src/Bundle/ChillThirdPartyBundle/Entity/ThirdParty.php

@@ -221,7 +221,7 @@ class ThirdParty implements TrackCreationInterface, TrackUpdateInterface
      *     message="Invalid phone number: it should begin with the international prefix starting with ""+"", hold only digits and be smaller than 20 characters. Ex: +33123456789"
      * )
      * @PhonenumberConstraint(type="any")
-     * @Groups({"read", "write", "dogen:read", "docgen:read:3party:parent"})
+     * @Groups({"read", "write", "docgen:read", "docgen:read:3party:parent"})
      */
     private ?string $telephone = null;
 
@@ -464,10 +464,8 @@ class ThirdParty implements TrackCreationInterface, TrackUpdateInterface
 
     /**
      * Get telephone.
-     *
-     * @return string|null
      */
-    public function getTelephone()
+    public function getTelephone(): ?string
     {
         return $this->telephone;
     }

src/Bundle/ChillThirdPartyBundle/Tests/Serializer/Normalizer/ThirdPartyDocGenNormalizerTest.php

@@ -91,11 +91,14 @@ final class ThirdPartyDocGenNormalizerTest extends KernelTestCase
             ->setName('test')
             ->setCivility((new Civility())->setName(['fr' => 'Monsieur'])->setAbbreviation(['fr' => 'M.']))
             ->setEmail('info@cl.coop')
+            ->setTelephone('+32486123456')
             ->addTypesAndCategories('kind')
             ->addTypesAndCategories((new ThirdPartyCategory())->setName(['fr' => 'category']));
 
         $actual = $this->normalizer->normalize($thirdparty, 'docgen', ['groups' => ['docgen:read']]);
 
         $this->assertIsArray($actual);
+        $this->assertArrayHasKey('telephone', $actual);
+        $this->assertEquals('+32486123456', $actual['telephone']);
     }
 }