Add test for Object::InstanceOf

Author: JoseExposito

test/object/object.cc

@@ -228,6 +228,12 @@ Value CreateObjectUsingMagic(const CallbackInfo& info) {
   return obj;
 }
 
+Value InstanceOf(const CallbackInfo& info) {
+  Object obj = info[0].As<Object>();
+  Function constructor = info[1].As<Function>();
+  return Boolean::New(info.Env(), obj.InstanceOf(constructor));
+}
+
 Object InitObject(Env env) {
   Object exports = Object::New(env);
 
@@ -265,5 +271,7 @@ Object InitObject(Env env) {
   exports["addFinalizer"] = Function::New(env, AddFinalizer);
   exports["addFinalizerWithHint"] = Function::New(env, AddFinalizerWithHint);
 
+  exports["instanceOf"] = Function::New(env, InstanceOf);
+
   return exports;
 }

test/object/object.js

@@ -137,4 +137,13 @@ function test(binding) {
       circular2: magicObject
     });
   }
+
+  {
+    function Ctor() {};
+
+    assert.strictEqual(binding.object.instanceOf(new Ctor(), Ctor), true);
+    assert.strictEqual(binding.object.instanceOf(new Ctor(), Object), true);
+    assert.strictEqual(binding.object.instanceOf({}, Ctor), false);
+    assert.strictEqual(binding.object.instanceOf(null, Ctor), false);
+  }
 }