Add test if endpoint is null and endpoint_url has custom url

Author: Camille Islasse

Diff for: tests/Api/ApiTest.php

@@ -172,6 +172,20 @@ public function provideCreateRequestUrl(): Generator
             'https://paiement.systempay.fr/vads-payment/?vads_action_mode=INTERACTIVE&vads_page_action=PAYMENT&vads_payment_config=SINGLE&vads_return_mode=POST&vads_version=V2&vads_amount=1234&vads_currency=978&vads_trans_date=20200101120000&vads_trans_id=000001&vads_site_id=123456789&vads_ctx_mode=PRODUCTION&signature=p9TbeohlOZVPAmhEwfAlGxRJxFAKpNg5wYBSN9emuqs%3D',
         ];
 
+        yield [
+            [
+                'endpoint_url' => 'https://custom-url.fr/vads-payment/',
+            ],
+            [
+                'vads_amount'     => '1234',
+                'vads_currency'   => '978',
+                'vads_trans_date' => '20200101120000',
+                'vads_trans_id'   => '000001',
+            ],
+            'https://custom-url.fr/vads-payment/?vads_action_mode=INTERACTIVE&vads_page_action=PAYMENT&vads_payment_config=SINGLE&vads_return_mode=POST&vads_version=V2&vads_amount=1234&vads_currency=978&vads_trans_date=20200101120000&vads_trans_id=000001&vads_site_id=123456789&vads_ctx_mode=PRODUCTION&signature=p9TbeohlOZVPAmhEwfAlGxRJxFAKpNg5wYBSN9emuqs%3D',
+        ];
+
+
         yield [
             [
                 'endpoint' => Api::ENDPOINT_SCELLIUS,