Illuminate\Support\Facades\Facade::spy PHP Method

    public static function spy()
    {
        $name = static::getFacadeAccessor();
        if (static::isMock()) {
            $mock = static::$resolvedInstance[$name];
        } else {
            $class = static::getMockableClass($name);
            $mock = $class ? Mockery::spy($class) : Mockery::spy();
            static::$resolvedInstance[$name] = $mock;
            if (isset(static::$app)) {
                static::$app->instance($name, $mock);
            }
        }
    }