t.Errorf("NaN is equal to NaN")
	}
}

func TestUndefined(t *testing.T) {
	if !js.Undefined().IsUndefined() {
		t.Errorf("undefined is not undefined")
	}
	if !js.Undefined().Equal(js.Undefined()) {
		t.Errorf("undefined is not equal to undefined")
	}
	if dummys.IsUndefined() {
		t.Errorf("object is undefined")
	}
	if js.Undefined().IsNull() {
		t.Errorf("undefined is null")
	}

	return v.ref == w.ref && v.ref != valueNaN.ref
}

// Undefined returns the JavaScript value "undefined".
func Undefined() Value {
	return valueUndefined
}

// IsUndefined reports whether v is the JavaScript value "undefined".
func (v Value) IsUndefined() bool {
	return v.ref == valueUndefined.ref
}

// Null returns the JavaScript value "null".
func Null() Value {
	return valueNull
}