Set fallback for Whoops < 2.1.5

Author: Mateusz Lopacinski

src/Middleware/WhoopsErrorResponseGenerator.php

@@ -59,7 +59,14 @@ public function __invoke($e, ServerRequestInterface $request, ResponseInterface
 
             // Set Json content type header
             if ($handler instanceof JsonResponseHandler) {
-                $response = $response->withHeader('Content-Type', $handler->contentType());
+                $contentType = 'application/json';
+
+                // Whoops < 2.1.5 does not provide contentType method
+                if (method_exists($handler, 'contentType')) {
+                    $contentType = $handler->contentType();
+                }
+
+                $response = $response->withHeader('Content-Type', $contentType);
             }
         }
 

test/Middleware/WhoopsErrorResponseGeneratorTest.php

@@ -118,7 +118,10 @@ public function testJsonContentTypeResponseWithJsonResponseHandler()
         $error = new RuntimeException();
 
         $handler = $this->prophesize(JsonResponseHandler::class);
-        $handler->contentType()->willReturn('application/json');
+
+        if (method_exists(JsonResponseHandler::class, 'contentType')) {
+            $handler->contentType()->willReturn('application/json');
+        }
 
         $this->whoops->getHandlers()->willReturn([$handler->reveal()]);
         $this->whoops->handleException($error)->willReturn('error');