public void TestNPuzzleProblemAcceptableAction()
{
int[] state = { 5, 6, 2, 8, 9, 3, 1, 4, 7 };
NPuzzleState <int[]> initialState = new NPuzzleState <int[]>(state);
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> problem = CreateProblem(initialState);
Assert.True(problem.AcceptableAction(initialState.State, 4, -1));
Assert.True(problem.AcceptableAction(initialState.State, 4, 1));
Assert.True(problem.AcceptableAction(initialState.State, 4, -2));
Assert.True(problem.AcceptableAction(initialState.State, 4, 2));
Assert.False(problem.AcceptableAction(initialState.State, 4, 3));
Assert.False(problem.AcceptableAction(initialState.State, 4, 0));
int[] state2 = { 4, 9, 8, 2, 3, 5, 6, 7, 1 };
NPuzzleState <int[]> state2State = new NPuzzleState <int[]>(state2);
problem = CreateProblem(state2State);
NPuzzleState <int[]> initialState2 = new NPuzzleState <int[]>(state2);
Assert.True(problem.AcceptableAction(initialState2.State, 1, -1));
Assert.True(problem.AcceptableAction(initialState2.State, 1, 1));
Assert.True(problem.AcceptableAction(initialState2.State, 1, -2));
}
public void TestNPuzzleInitialState()
{
int[] goal = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int[] initial = { 1, 2, 3, 4, 5, 6, 7, 9, 8 };
NPuzzleState <int[]> goalState = new NPuzzleState <int[]>(goal);
NPuzzleState <int[]> initialState = new NPuzzleState <int[]>(initial);
try {
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> problem = new Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int>(goalState, initialState);
Assert.NotNull(problem);
Assert.NotNull(problem.InitialState);
Assert.AreEqual(problem.InitialState, initialState);
Problem.AbstractProblem <NPuzzleState <int[]>, int, int> p2 = new Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int>(goalState, initialState);
Assert.NotNull(p2);
Assert.True(p2.GoalTest(goalState));
Assert.AreEqual(p2.Result(initialState, 1), goalState);
List <int> results = new List <int>();
results.Add(1);
results.Add(-1);
results.Add(2);
Assert.AreEqual(p2.Actions(initialState), results);
} catch (NPuzzleUtils.InvalidNPuzzleStatesException ex) {
}
}
public void TestSearchClassCreation()
{
int size = 9;
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> problem = NPuzzleUtils.CreateProblem(size);
Heuristics.HeuristicFunction <NPuzzleState <int[]>, int, int> handler = Heuristics.NPuzzleHeuristics.ManhattanDistance;
//Search.BestFirstGraphSearch<int[], int, int, int> bfgs = new Search.BestFirstGraphSearch<int[], int, int, int>(problem, handler);
}
public void TestExpand()
{
int[] goal = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
NPuzzleState <int[]> goalState = new NPuzzleState <int[]>(goal);
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> rootNode = new SearchTreeNode.Node <NPuzzleState <int[]>, int, int>(goalState);
List <SearchTreeNode.Node <NPuzzleState <int[]>, int, int> > expandedNodes;
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> problem = NPuzzleUtils.CreateProblem(9);
expandedNodes = rootNode.Expand(problem);
List <SearchTreeNode.Node <NPuzzleState <int[]>, int, int> > testNodes = new List <SearchTreeNode.Node <NPuzzleState <int[]>, int, int> >();
//! actions for goal are -1 and 2
//! state resulting from action 2
int[] s1 = { 1, 2, 3, 4, 5, 9, 7, 8, 6 };
NPuzzleState <int[]> s1State = new NPuzzleState <int[]>(s1);
//! state resulting from -1
int[] s2 = { 1, 2, 3, 4, 5, 6, 7, 9, 8 };
NPuzzleState <int[]> s2State = new NPuzzleState <int[]>(s2);
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> node2 = new SearchTreeNode.Node <NPuzzleState <int[]>, int, int>(s1State, rootNode, 2, 1);
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> node3 = new SearchTreeNode.Node <NPuzzleState <int[]>, int, int>(s2State, rootNode, -1, 1);
testNodes.Add(node3);
testNodes.Add(node2);
Assert.AreEqual(testNodes.Count, expandedNodes.Count);
Assert.AreEqual(expandedNodes[0].state, node3.state);
// Assert.True(expandedNodes[0].state.Equals( node3.state));
Assert.AreEqual(expandedNodes[0].parent, node3.parent);
Assert.True(expandedNodes[0].parent.Equals(node3.parent));
Assert.AreEqual(expandedNodes[0].action, node3.action);
Assert.True(expandedNodes[0].action.Equals(node3.action));
Assert.AreEqual(expandedNodes[0].depth, node3.depth);
Assert.True(expandedNodes[0].depth.Equals(node3.depth));
Assert.AreEqual(expandedNodes[0].pathCost, node3.pathCost);
Assert.True(expandedNodes[0].pathCost.Equals(node3.pathCost));
// Assert.True(expandedNodes[0].Equals(node3));
// Assert.AreEqual(expandedNodes[0], node3);
// Assert.AreEqual(expandedNodes[1], node2);
// CollectionAssert.AreEqual(testNodes, expandedNodes);
// Assert.That(testNodes, Is.EquivalentTo(expandedNodes));
}
public void TestNPuzzleProblemCreation()
{
int[] goal = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int[] initial = { 1, 2, 3, 4, 5, 6, 7, 9, 8 };
NPuzzleState <int[]> goalState = new NPuzzleState <int[]>(goal);
NPuzzleState <int[]> initialState = new NPuzzleState <int[]>(initial);
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> problem = new Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int>(goalState, initialState);
problem.Actions(goalState);
Assert.Throws <NPuzzleUtils.InvalidNPuzzleStatesException>(() => new Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int>(initialState, goalState));
}
public void TestNPuzzleProblemResult()
{
int[] state = { 7, 6, 4, 9, 8, 2, 5, 3, 1 };
NPuzzleState <int[]> initialState = new NPuzzleState <int[]>(state);
//! acceptable actions are -2, 2, 1
//! -2
int[] r1 = { 7, 6, 4, 5, 8, 2, 9, 3, 1 };
NPuzzleState <int[]> r1State = new NPuzzleState <int[]>(r1);
int[] r2 = { 9, 6, 4, 7, 8, 2, 5, 3, 1 };
NPuzzleState <int[]> r2State = new NPuzzleState <int[]>(r2);
int[] r3 = { 7, 6, 4, 8, 9, 2, 5, 3, 1 };
NPuzzleState <int[]> r3State = new NPuzzleState <int[]>(r3);
int[] s2 = { 8, 5, 2, 9, 3, 7, 4, 6, 1 };
NPuzzleState <int[]> s2State = new NPuzzleState <int[]>(s2);
// 2
int[] s2r1 = { 9, 5, 2, 8, 3, 7, 4, 6, 1 };
NPuzzleState <int[]> s2r1State = new NPuzzleState <int[]>(s2r1);
// -2
int[] s2r2 = { 8, 5, 2, 4, 3, 7, 9, 6, 1 };
NPuzzleState <int[]> s2r2State = new NPuzzleState <int[]>(s2r2);
// 1
int[] s2r3 = { 8, 5, 2, 3, 9, 7, 4, 6, 1 };
NPuzzleState <int[]> s2r3State = new NPuzzleState <int[]>(s2r3);
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> problem = CreateProblem(initialState);
CollectionAssert.AreEquivalent(r1State, problem.Result(initialState, -2));
CollectionAssert.AreEquivalent(r2State, problem.Result(initialState, 2));
CollectionAssert.AreEquivalent(r3State, problem.Result(initialState, 2));
CollectionAssert.AreEquivalent(s2r1State, problem.Result(s2State, 2));
CollectionAssert.AreEquivalent(s2r2State, problem.Result(s2State, -2));
CollectionAssert.AreEquivalent(s2r3State, problem.Result(s2State, 1));
Assert.Throws <NPuzzleUtils.ResultAcceptableActionException>(() => problem.Result(initialState, 0));
}
public void TestNPuzzleProblemGoalTest()
{
int[] state = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
NPuzzleState <int[]> initialState = new NPuzzleState <int[]>(state);
int[] state2 = { 1, 2, 3, 4, 5, 6, 7, 9, 8 };
NPuzzleState <int[]> initialState2 = new NPuzzleState <int[]>(state2);
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> problem = CreateProblem(initialState);
Assert.False(problem.GoalTest(initialState2));
Assert.True(problem.GoalTest(initialState));
}
public void TestSomething()
{
int size = 9;
int[] goal = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
NPuzzleState <int[]> goalState = new NPuzzleState <int[]>(goal);
NPuzzleState <int[]> initial = NPuzzleUtils.GenerateInitState(size);
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> npuzzle = new Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int>(goalState, initial);
HashSet <NPuzzleState <int[]> > explored = new HashSet <NPuzzleState <int[]> >();
//! first node in the frontier is the initialState
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> node = new SearchTreeNode.Node <NPuzzleState <int[]>, int, int>(npuzzle.InitialState);
}
public void TestAStarGraphSearch()
{
int size = 9;
int[] goal = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
NPuzzleState <int[]> goalState = new NPuzzleState <int[]>(goal);
NPuzzleState <int[]> initial = NPuzzleUtils.GenerateInitState(size);
Assert.True(NPuzzleUtils.AcceptableState(initial.State));
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> npuzzle = new Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int>(goalState, initial);
Assert.AreEqual(npuzzle.InitialState, initial);
Assert.AreEqual(npuzzle.GoalState, goal);
//Heuristics.HeuristicFunction<NPuzzleState<int[]>,int, int> handler = Heuristics.NPuzzleHeuristics.ManhattanDistance;
Heuristics.Heurfun <int, SearchTreeNode.Node <NPuzzleState <int[]>, int, int> > handler = Heuristics.NPuzzleHeuristics.AStarManhattanDistance;
try
{
Assert.AreEqual(npuzzle.InitialState, initial);
// Search.BestFirstGraphSearch<int[],int,int> bfgs = new Search.BestFirstGraphSearch<int[],int,int>(npuzzle, handler);
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> initialNode = new SearchTreeNode.Node <NPuzzleState <int[]>, int, int>(npuzzle.InitialState);
// Search.PriorityQueue<int, SearchTreeNode.Node<NPuzzleState<int[]>,int,int>> frontier = new Search.PriorityQueue<int, SearchTreeNode.Node<NPuzzleState<int[]>,int,int>>();
Search.AStarGraphSearch <NPuzzleState <int[]>, int, int> asgs = new Search.AStarGraphSearch <NPuzzleState <int[]>, int, int>(npuzzle, handler);
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> node = asgs.Search();
List <int> solution = node.Solution();
Console.WriteLine("Printing solution to AStar:");
solution.ForEach(delegate(int a) {
Console.Write("{0} ", a);
});
Console.WriteLine("");
} catch (NPuzzleUtils.InvalidProblemException ex)
{
System.Console.WriteLine("There is an InvalidProblemException here doode");
System.Console.WriteLine(ex.Message);
throw ex;
} catch (NPuzzleUtils.InvalidProblemPropertyException ex)
{
throw ex;
} catch (System.NullReferenceException ex)
{
Console.WriteLine(ex);
}
}
public void TestNPuzzleProblemActions()
{
int[] initial = { 1, 2, 3, 4, 5, 6, 7, 9, 8 };
NPuzzleState <int[]> initialState = new NPuzzleState <int[]>(initial);
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> problem = CreateProblem(initialState);
List <int> actions = problem.Actions(initialState);
List <int> expected = new List <int>();
expected.Add(-1);
expected.Add(1);
expected.Add(2);
CollectionAssert.AreEquivalent(expected, actions);
int[] initial2 = { 9, 7, 4, 2, 6, 3, 5, 8, 1 };
NPuzzleState <int[]> initialState2 = new NPuzzleState <int[]>(initial2);
problem = CreateProblem(initialState2);
actions = problem.Actions(initialState2);
expected = new List <int>();
expected.Add(-2);
expected.Add(1);
CollectionAssert.AreEquivalent(expected, actions);
int[] initial3 = { 2, 4, 8, 6, 3, 9, 7, 1, 5 };
NPuzzleState <int[]> initialState3 = new NPuzzleState <int[]>(initial3);
problem = CreateProblem(initialState3);
actions = problem.Actions(initialState3);
expected = new List <int>();
expected.Add(-2);
expected.Add(2);
expected.Add(-1);
CollectionAssert.AreEquivalent(expected, actions);
int[] initial4 = { 2, 4, 8, 6, 9, 3, 7, 1, 5 };
NPuzzleState <int[]> initialState4 = new NPuzzleState <int[]>(initial4);
problem = CreateProblem(initialState4);
actions = problem.Actions(initialState4);
expected = new List <int>();
expected.Add(-2);
expected.Add(2);
expected.Add(-1);
expected.Add(1);
CollectionAssert.AreEquivalent(expected, actions);
}
public void TestNPuzzleProblemGetEmptyIndex()
{
int[] state = { 9, 7, 3, 6, 5, 2, 8, 1, 4 };
NPuzzleState <int[]> initialState = new NPuzzleState <int[]>(state);
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> problem = CreateProblem(initialState);
Assert.AreEqual(problem.GetEmptyIndex(initialState.State), 0);
int[] state2 = { 1, 7, 6, 5, 4, 3, 8, 2, 9 };
NPuzzleState <int[]> initialState2 = new NPuzzleState <int[]>(state2);
Assert.AreEqual(problem.GetEmptyIndex(initialState2.State), 8);
int[] state3 = { 1, 2, 3, 4, 5, 6, 7, 8, 8 };
NPuzzleState <int[]> initialState3 = new NPuzzleState <int[]>(state3);
// Assert.Throws<NPuzzleUtils.MissingEmptyElementException>(() =>problem.GetEmptyIndex(state3));
Assert.AreEqual(problem.GetEmptyIndex(initialState3.State), -1);
}
public void TestChildNode()
{
int[] goal = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
NPuzzleState <int[]> goalState = new NPuzzleState <int[]>(goal);
//! action -1
int[] s1 = { 1, 2, 3, 4, 5, 9, 7, 8, 6 };
NPuzzleState <int[]> s1State = new NPuzzleState <int[]>(s1);
int[] s2 = { 1, 2, 3, 4, 5, 6, 7, 9, 8 };
NPuzzleState <int[]> s2State = new NPuzzleState <int[]>(s2);
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> node = new SearchTreeNode.Node <NPuzzleState <int[]>, int, int>(goalState);
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> childNode = new SearchTreeNode.Node <NPuzzleState <int[]>, int, int>(s2State, node, -1, 1);
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> childNode2 = new SearchTreeNode.Node <NPuzzleState <int[]>, int, int>(s1State, node, 2, 1);
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> problem = NPuzzleUtils.CreateProblem(9);
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> expectedNode = node.ChildNode(problem, -1);
SearchTreeNode.Node <NPuzzleState <int[]>, int, int> expectedNode2 = node.ChildNode(problem, 2);
//! Tests
Assert.AreEqual(node.depth, 0);
Assert.AreEqual(expectedNode.parent, childNode.parent);
Assert.AreEqual(expectedNode.pathCost, childNode.pathCost);
Assert.AreEqual(expectedNode.state, childNode.state);
Assert.AreEqual(expectedNode.action, -1);
Assert.AreEqual(expectedNode.depth, 1);
Assert.AreEqual(expectedNode2.parent, childNode2.parent);
Assert.AreEqual(expectedNode2.pathCost, childNode2.pathCost);
Assert.AreEqual(expectedNode2.state, childNode2.state);
Assert.AreEqual(expectedNode2.action, 2);
Assert.AreEqual(expectedNode2.depth, 1);
}
/*!
* Create a random instance of a problem
*/
public static Problem.NPuzzleProblem <Problem.NPuzzleState <int[]>, int, int> CreateProblem(int size)
{
if (!AcceptableLength(size))
{
string msg = String.Format("Length given: {0}", size);
UnacceptableLengthException ex = new UnacceptableLengthException(msg);
throw ex;
}
int[] goalState = new int[size];
NPuzzleState <int[]> initial;
for (int i = 0; i < size; i++)
{
goalState[i] = i + 1;
}
NPuzzleState <int[]> goal = new NPuzzleState <int[]>(goalState);
initial = GenerateInitState(size);
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> problem = new Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int>(goal, initial);
return(problem);
}
private Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> CreateProblem(NPuzzleState <int[]> initial)
{
int[] goal = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int> problem = new Problem.NPuzzleProblem <NPuzzleState <int[]>, int, int>(new NPuzzleState <int[]>(goal), initial);
return(problem);
}