Set 422 as default error code

Author: odan

src/Exception/ValidationException.php

@@ -27,7 +27,7 @@ final class ValidationException extends DomainException
     public function __construct(
         string $message,
         ValidationResult $validationResult,
-        int $code = 0,
+        int $code = 422,
         Throwable $previous = null
     ) {
         parent::__construct($message, $code, $previous);

tests/Middleware/ErrorMiddleware.php

@@ -30,6 +30,6 @@ public function process(ServerRequestInterface $request, RequestHandlerInterface
 
         $validation->addError('username', 'Input required');
 
-        throw new ValidationException('Please check your input', $validation);
+        throw new ValidationException('Please check your input', $validation, 422);
     }
 }

tests/Middleware/ValidationExceptionMiddlewareTest.php

@@ -23,7 +23,7 @@ class ValidationExceptionMiddlewareTest extends TestCase
      *
      * @return void
      */
-    public function testNoError()
+    public function testNoError(): void
     {
         $middleware = new ValidationExceptionMiddleware(
             new ResponseFactory(),
@@ -44,7 +44,7 @@ public function testNoError()
      *
      * @return void
      */
-    public function testWithError()
+    public function testWithError(): void
     {
         $middleware = new ValidationExceptionMiddleware(
             new ResponseFactory(),
@@ -58,7 +58,7 @@ public function testWithError()
         ]);
 
         static::assertSame(
-            '{"error":{"message":"Please check your input","details":' .
+            '{"error":{"message":"Please check your input","code":422,"details":' .
             '[{"message":"Input required","field":"username"}]}}',
             (string)$response->getBody()
         );