Fix __proto__ test case on Node 0.8

Author: mnespor

test/index.js

@@ -629,10 +629,14 @@ test('non-object target', function (t) {
 
 test('__proto__ is merged as an own property', function (t) {
 	var malicious = JSON.parse('{ "fred": 1, "__proto__": { "george": 1 } }');
-	var target = {};
-	extend(true, target, malicious);
-	t.notOk(target.george);
-	t.ok(Object.prototype.hasOwnProperty.call(target, '__proto__'));
-	t.deepEqual(target.__proto__, { george: 1 }); // eslint-disable-line no-proto
+	// this test isn't valid for earlier versions of V8, which strip __proto__ during JSON.parse()
+	if (Object.prototype.hasOwnProperty.call(malicious, '__proto__')) {
+		var target = {};
+		extend(true, target, malicious);
+		t.notOk(target.george);
+		t.ok(Object.prototype.hasOwnProperty.call(target, '__proto__'));
+		t.deepEqual(target.__proto__, { george: 1 }); // eslint-disable-line no-proto
+	}
+
 	t.end();
 });