// This file was copied from mgo, MongoDB driver for Go.
//
// Copyright (c) 2010-2013 - Gustavo Niemeyer <gustavo@niemeyer.net>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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package plan

import (
	. "gopkg.in/check.v1"
)

type TarjanSuite struct{}

var _ = Suite(TarjanSuite{})

func (TarjanSuite) TestExample(c *C) {
	successors := map[string][]string{
		"1": {"2", "3"},
		"2": {"1", "5"},
		"3": {"4"},
		"4": {"3", "5"},
		"5": {"6"},
		"6": {"7"},
		"7": {"8"},
		"8": {"6", "9"},
		"9": {},
	}

	c.Assert(tarjanSort(successors), DeepEquals, [][]string{
		{"9"},
		{"6", "7", "8"},
		{"5"},
		{"3", "4"},
		{"1", "2"},
	})
}
