protected function addKeyValue(EntityInterface $entity, AttributeInterface $attribute, array $options = array())
    {
        $values = array();

        $number_of_values = $this->faker->numberBetween(1, 5);
        for ($i = 0; $i < $number_of_values; $i++) {
            $values[$this->faker->word] = $this->faker->sentence;
        }

        $this->setValue($entity, $attribute, $values, $options);
    }