public void TestManhattanDistance()
{
//! md = 0
int[] goal = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
NPuzzleState <int[]> goalState = new NPuzzleState <int[]>(goal);
//! -1, md = 1
int[] s1 = { 1, 2, 3, 4, 5, 6, 7, 9, 8 };
NPuzzleState <int[]> s1State = new NPuzzleState <int[]>(s1);
//! 2, md = 2
int[] s2 = { 1, 2, 3, 4, 9, 6, 7, 5, 8 };
NPuzzleState <int[]> s2State = new NPuzzleState <int[]>(s2);
//! 1, md 3
int[] s3 = { 1, 2, 3, 4, 6, 9, 7, 5, 8 };
NPuzzleState <int[]> s3State = new NPuzzleState <int[]>(s3);
//! 2 md = 4
int[] s4 = { 1, 2, 9, 4, 6, 3, 7, 5, 8 };
NPuzzleState <int[]> s4State = new NPuzzleState <int[]>(s4);
//! -1 md = 5
int[] s5 = { 1, 9, 2, 4, 6, 3, 7, 5, 8 };
NPuzzleState <int[]> s5State = new NPuzzleState <int[]>(s5);
//! -1 md = 6
int[] s6 = { 9, 1, 2, 4, 6, 3, 7, 5, 8 };
NPuzzleState <int[]> s6State = new NPuzzleState <int[]>(s6);
//! 3 + 2 + 1 + 1 + 1 + 1 + 3
int[] s7 = { 6, 4, 3, 1, 9, 5, 8, 7, 2 };
NPuzzleState <int[]> s7State = new NPuzzleState <int[]>(s7);
//! 2 + 2 + 1 + 1 + 2 = 8
int[] s8 = { 1, 6, 3, 8, 4, 5, 7, 2, 9 };
NPuzzleState <int[]> s8State = new NPuzzleState <int[]>(s8);
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> node8 = new SearchTreeNode.Node <NPuzzleState <int[]>, int, int>(s8State);
Assert.AreEqual(NPuzzleHeuristics.ManhattanDistance(node8), 8);
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> node7 = new SearchTreeNode.Node <NPuzzleState <int[]>, int, int>(s7State);
Assert.AreEqual(NPuzzleHeuristics.ManhattanDistance(node7), 12);
List <SearchTreeNode.Node <NPuzzleState <int[]>, int, int> > nodes = TestNode.CreateNodesForTesting();
Assert.AreEqual(nodes[0].state.State, goal);
Assert.AreEqual(NPuzzleHeuristics.ManhattanDistance(nodes[0]), 0);
Assert.AreEqual(nodes[1].state.State, s1);
Assert.AreEqual(NPuzzleHeuristics.ManhattanDistance(nodes[1]), 1);
Assert.AreEqual(nodes[2].state.State, s2);
Assert.AreEqual(NPuzzleHeuristics.ManhattanDistance(nodes[2]), 2);
Assert.AreEqual(nodes[3].state.State, s3);
Assert.AreEqual(NPuzzleHeuristics.ManhattanDistance(nodes[3]), 3);
Assert.AreEqual(nodes[4].state.State, s4);
Assert.AreEqual(NPuzzleHeuristics.ManhattanDistance(nodes[4]), 4);
Assert.AreEqual(nodes[5].state.State, s5);
Assert.AreEqual(NPuzzleHeuristics.ManhattanDistance(nodes[5]), 5);
}