Adjust TicketparkApiClientTest

composer.json

@@ -23,6 +23,7 @@
     "require-dev": {
         "phpunit/phpunit": "^9.6",
         "rector/rector": "^0.18.3",
-        "friendsofphp/php-cs-fixer": "^3.27"
+        "friendsofphp/php-cs-fixer": "^3.27",
+        "phpspec/prophecy": "^1.17"
     }
 }

lib/ApiClient/Http/Client.php

@@ -8,7 +8,7 @@
 use GuzzleHttp\Exception\ClientException;
 use GuzzleHttp\Psr7\Response as GuzzleResponse;
 
-final class Client
+final class Client implements ClientInterface
 {
     private GuzzleClient $guzzle;
 

lib/ApiClient/Http/ClientInterface.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Ticketpark\ApiClient\Http;
+
+interface ClientInterface
+{
+    public function head(string $url, array $headers): Response;
+
+    public function get(string $url, array $headers): Response;
+
+    public function post(string $url, string $content, array $headers): Response;
+
+    public function postForm(string $url, array $formData, array $headers): Response;
+
+    public function patch(string $url, string $content, array $headers): Response;
+
+    public function delete(string $url, array $headers): Response;
+}

lib/ApiClient/TicketparkApiClient.php

@@ -3,6 +3,7 @@
 namespace Ticketpark\ApiClient;
 
 use Ticketpark\ApiClient\Http\Client;
+use Ticketpark\ApiClient\Http\ClientInterface;
 use Ticketpark\ApiClient\Http\Response;
 use Ticketpark\ApiClient\Exception\TokenGenerationException;
 use Ticketpark\ApiClient\Token\AccessToken;
@@ -13,7 +14,7 @@ class TicketparkApiClient
     private const ROOT_URL = 'https://api.ticketpark.ch';
     private const REFRESH_TOKEN_LIFETIME = 30 * 86400;
 
-    private ?Client $client = null;
+    private ?ClientInterface $client = null;
     private ?string $username = null;
     private ?string $password = null;
     private ?RefreshToken $refreshToken = null;
@@ -124,7 +125,12 @@ public function generateTokens(): void
         throw new TokenGenerationException('Failed to generate a access tokens. Make sure to provide a valid refresh token or user credentials.');
     }
 
-    private function getClient(): Client
+    public function setClient(ClientInterface $client): void
+    {
+        $this->client = $client;
+    }
+
+    private function getClient(): ClientInterface
     {
         if (null === $this->client) {
             $this->client = new Client();
@@ -160,7 +166,7 @@ private function doGenerateTokens(array $data): bool
         $headers = [
             'Content-Type'  => 'application/x-www-form-urlencoded',
             'Accept'        => 'application/json',
-            'Authorization' => 'Basic '.base64_encode($this->apiKey . ':' . $this->apiSecret)
+            'Authorization' => 'Basic ' . base64_encode($this->apiKey . ':' . $this->apiSecret)
         ];
 
         $response = $this->getClient()->postForm(