) {
		echo '[TEST_LOOPBACK]';
		exit;
	}


	/**
	 * Adds the WooCommerce debug tool.
	 *
	 * @since 4.8.0
	 *
	 * @param array $tools WooCommerce core tools
	 * @return array
	 */
	public function add_debug_tool( $tools ) {
		// this key is not unique to the plugin to avoid duplicate tools
		$tools['sv_wc_background_job_test'] = [
			'name'     => __( 'Background Processing Test', 'facebook-for-woocommerce' ),
			'button'   => __( 'Run Test', 'facebook-for-woocommerce' ),
			'desc'     => __( 'This tool will test whether your server is capable of processing background jobs.', 'facebook-for-woocommerce' ),
			'callback' => [ $this, 'run_debug_tool' ],
		];

		return $tools;
	}


	/**
	 * Runs the test connection debug tool.
	 *
	 * @since 4.8.0
	 *
	 * @return string
	 */
	public function run_debug_tool() {
		if ( $this->test_connection() ) {
			$this->debug_message = esc_html__( 'Success! You should be able to process background jobs.', 'facebook-for-woocommerce' );
			$result              = true;
		} else {
			$this->debug_message = esc_html__( 'Could not connect. Please ask your hosting company to ensure your server has loopback connections enabled.', 'facebook-for-woocommerce' );
			$result              = false;
		}

		return $result;
	}


	/**
	 * Translate the tool success message.
	 *
	 * This can be removed in favor of returning the message string in `run_debug_tool()`
	 *  when WC 3.1 is required, though that means the message will always be "success" styled.
	 *
	 * @since 4.8.0
	 *
	 * @param string $translated the text to output
	 * @param string $original the original text
	 * @param string $domain the textdomain
	 * @return string the updated text
	 */
	public function translate_success_message( $translated, $original, $domain ) {
		if ( 'woocommerce' === $domain && ( 'Tool ran.' === $original || 'There was an error calling %s' === $original ) ) {
			$translated = $this->debug_message;
		}
		return $translated;
	}


	/** Helper Methods ********************************************************/


	/**
	 * Gets the job handler identifier.
	 *
	 * @since 4.8.0
	 *
	 * @return string
	 */
	public function get_identifier() {
		return $this->identifier;
	}
}