Add support for the draft-04 not keyword and unit test.

Author: Michael Chiocca

src/JsonSchema/Constraints/Undefined.php

@@ -139,6 +139,18 @@ protected function validateCommonProperties($value, $schema = null, $path = null
             }
         }
 
+        if (isset($schema->not)) {
+            $initErrors = $this->getErrors();
+            $this->checkUndefined($value, $schema->not, $path, is_null($i) ? "" : $i);
+
+            // if no new errors were raised then the instance validated against the "not" schema
+            if (count($this->getErrors()) == count($initErrors)) {
+                $this->addError($path, "matches a schema which it should not");
+            } else {
+                $this->errors = $initErrors;
+            }
+        }
+
         // Verify minimum and maximum number of properties
         if (is_object($value)) {
             if (isset($schema->minProperties)) {

tests/JsonSchema/Tests/Constraints/NotTest.php

@@ -0,0 +1,73 @@
+<?php
+
+/*
+ * This file is part of the JsonSchema package.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace JsonSchema\Tests\Constraints;
+
+class NotTest extends BaseTestCase
+{
+    public function getInvalidTests()
+    {
+        return array(
+            array(
+                '{
+                    "x": [1, 2]
+                }',
+                '{
+                    "properties": {
+                        "x": {
+                            "not": {
+                                "type": "array",
+                                "items": {"type": "integer"},
+                                "minItems": 2
+                            }
+                        }
+                    }
+                }'
+            )
+        );
+    }
+
+    public function getValidTests()
+    {
+        return array(
+            array(
+                '{
+                    "x": [1]
+                }',
+                '{
+                    "properties": {
+                        "x": {
+                            "not": {
+                                "type": "array",
+                                "items": {"type": "integer"},
+                                "minItems": 2
+                            }
+                        }
+                    }
+                }'
+            ),
+            array(
+                '{
+                    "x": ["foo", 2]
+                }',
+                '{
+                    "properties": {
+                        "x": {
+                            "not": {
+                                "type": "array",
+                                "items": {"type": "integer"},
+                                "minItems": 2
+                            }
+                        }
+                    }
+                }'
+            )
+        );
+    }
+}

tests/JsonSchema/Tests/Drafts/Draft4Test.php

@@ -19,7 +19,6 @@ protected function getSkippedTests()
             'allOf.json',
             'anyOf.json',
             'definitions.json',
-            'not.json',
             'oneOf.json',
             // Partially Implemented
             'ref.json',