add option to disable ignore unknown properties

src/SchemaTraverser.php

@@ -55,10 +55,12 @@ class SchemaTraverser
 {
     private array $pathStack = [];
     private bool $assertConstraints;
+    private bool $ignoreUnknown;
 
-    public function __construct(bool $assertConstraints = true)
+    public function __construct(bool $assertConstraints = true, bool $ignoreUnknown = true)
     {
         $this->assertConstraints = $assertConstraints;
+        $this->ignoreUnknown = $ignoreUnknown;
     }
 
     /**
@@ -218,6 +220,14 @@ protected function traverseStruct(\stdClass $data, StructType $type, Definitions
 
                 array_pop($this->pathStack);
             }
+
+            if ($this->ignoreUnknown === false) {
+                foreach ($data as $key => $value) {
+                    if (!array_key_exists($key, $properties)) {
+                        throw new ValidationException($this->getCurrentPath() . ' property "' . $key . '" is unknown', 'properties', $this->pathStack);
+                    }
+                }
+            }
         }
 
         return $visitor->visitStruct($result, $type, $this->getCurrentPath());

tests/SchemaTraverserTest.php

@@ -424,6 +424,25 @@ public function testTraverseExtends()
         $this->assertEquals('foo', $result->getParent()->getType());
     }
 
+    public function testTraverseUnknownProperties()
+    {
+        $this->expectException(ValidationException::class);
+        $this->expectExceptionMessage('/ property "foo" is unknown');
+
+        $schema = $this->schemaManager->getSchema(Form_Element_Input::class);
+        $data = <<<JSON
+{
+    "element": "text",
+    "name": "foo",
+    "type": "bar",
+    "foo": "bar"
+}
+JSON;
+
+        $traverser = new SchemaTraverser(ignoreUnknown: false);
+        $traverser->traverse(\json_decode($data), $schema, new TypeVisitor());
+    }
+
     protected function getData()
     {
         return json_decode(file_get_contents(__DIR__ . '/SchemaTraverser/expected.json'));