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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Postpay\Tests\HttpClients;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use PHPUnit\Framework\TestCase;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Postpay\Exceptions\RESTfulException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Postpay\Http\Request;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Postpay\Http\Response;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Postpay\HttpClients\Client;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Postpay\HttpClients\ClientInterface;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Postpay\HttpClients\GuzzleClient;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class ClientTest extends TestCase  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testGetClientHandler()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $client = new Client();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::assertInstanceOf(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ClientInterface::class,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $client->getClientHandler()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testSetClientHandler()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $client = new Client();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $clientHandler = new GuzzleClient();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $client->setClientHandler($clientHandler);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::assertEquals($clientHandler, $client->getClientHandler());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function testRequest()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $clientHandler = $this->createMock(ClientInterface::class);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $clientHandler->method('send')->willReturnCallback( | 
            
            
                                                                        
                            
            
                                    
            
            
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                            function (Request $request) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                                return new Response($request, 200);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $client = new Client($clientHandler);  | 
            
                            
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                        $response = $client->request(new Request('GET')); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        self::assertSame(200, $response->getStatusCode());  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function testRequestError()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $clientHandler = $this->createMock(ClientInterface::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $clientHandler->method('send')->willReturnCallback( | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            function (Request $request) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $body = json_encode([RESTfulException::ERROR_KEY => true]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                return new Response($request, 400, [], $body);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $client = new Client($clientHandler);  | 
            
                            
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                        $this->expectException(RESTfulException::class);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $client->request(new Request('GET')); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: