Samuel Bouchet
97bca7d7df
GameSim snapshots the state before each undoable command (PlacePiece / RemovePiece / MovePiece) into a bounded LinkedList stack (max 32). Undo() pops the last checkpoint and emits StateRestoredEvent, reusing the presentation rebuild path already wired for QuickLoad. Ctrl+Z in Main triggers the engine method; the harness exposes undo() for tests. QuickLoad clears the stack (fresh timeline). Seven unit tests cover empty stack, place/remove/move undo, reverse-order multiple undos, rejected commands not checkpointing, and post-simulation rewind.
120 lines
3.4 KiB
C#
120 lines
3.4 KiB
C#
using Chessistics.Engine.Commands;
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using Chessistics.Engine.Events;
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using Chessistics.Engine.Model;
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using Chessistics.Tests.Helpers;
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using Xunit;
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namespace Chessistics.Tests.Simulation;
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public class UndoTests
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{
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private SimHelper CreateSim()
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{
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var level = new BoardBuilder(4, 4)
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.WithProduction(0, 0, "Scierie", CargoType.Wood, amount: 1)
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.WithDemand(3, 0, "Depot", CargoType.Wood, 3, 30)
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.WithStock(PieceKind.Rook, 3)
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.Build();
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return SimHelper.FromLevel(level);
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}
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[Fact]
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public void Undo_EmptyStack_ReturnsNoEvents()
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{
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var sim = CreateSim();
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Assert.False(sim.Sim.CanUndo);
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Assert.Empty(sim.Sim.Undo());
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}
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[Fact]
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public void Undo_AfterPlace_RestoresPreviousState()
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{
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var sim = CreateSim();
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Assert.False(sim.Sim.CanUndo);
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sim.Place(PieceKind.Rook, (0, 0), (1, 0));
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Assert.Single(sim.Snapshot.Pieces);
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Assert.True(sim.Sim.CanUndo);
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var events = sim.Sim.Undo();
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Assert.Single(events);
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Assert.IsType<StateRestoredEvent>(events[0]);
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Assert.Empty(sim.Snapshot.Pieces);
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Assert.Equal(3, sim.Snapshot.RemainingStock[PieceKind.Rook]);
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Assert.False(sim.Sim.CanUndo);
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}
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[Fact]
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public void Undo_AfterRemove_RestoresPiece()
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{
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var sim = CreateSim();
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sim.Place(PieceKind.Rook, (0, 0), (1, 0));
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var pieceId = sim.Snapshot.Pieces[0].Id;
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sim.Remove(pieceId);
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Assert.Empty(sim.Snapshot.Pieces);
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sim.Sim.Undo();
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Assert.Single(sim.Snapshot.Pieces);
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Assert.Equal(pieceId, sim.Snapshot.Pieces[0].Id);
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}
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[Fact]
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public void Undo_MultipleMutations_UndoneInReverseOrder()
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{
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var sim = CreateSim();
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sim.Place(PieceKind.Rook, (0, 0), (1, 0));
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sim.Place(PieceKind.Rook, (0, 1), (1, 1));
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sim.Place(PieceKind.Rook, (0, 2), (1, 2));
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Assert.Equal(3, sim.Snapshot.Pieces.Count);
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sim.Sim.Undo();
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Assert.Equal(2, sim.Snapshot.Pieces.Count);
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sim.Sim.Undo();
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Assert.Single(sim.Snapshot.Pieces);
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sim.Sim.Undo();
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Assert.Empty(sim.Snapshot.Pieces);
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Assert.False(sim.Sim.CanUndo);
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}
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[Fact]
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public void Undo_RejectedPlacement_DoesNotCheckpoint()
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{
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var sim = CreateSim();
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// Invalid placement (off the board) — should be rejected and not undoable
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sim.Place(PieceKind.Rook, (99, 99), (100, 100));
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Assert.False(sim.Sim.CanUndo);
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}
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[Fact]
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public void Undo_AfterSimulationStep_RewindsTurnsToo()
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{
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// Placing then stepping means the sim advanced. Undo of the placement
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// should restore the pre-placement state — which also means turn 0.
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var sim = CreateSim();
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sim.Place(PieceKind.Rook, (0, 0), (1, 0));
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sim.Step();
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sim.Step();
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Assert.Equal(2, sim.Snapshot.TurnNumber);
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sim.Sim.Undo();
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Assert.Equal(0, sim.Snapshot.TurnNumber);
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Assert.Empty(sim.Snapshot.Pieces);
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}
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[Fact]
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public void QuickLoad_ClearsUndoStack()
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{
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var sim = CreateSim();
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sim.Place(PieceKind.Rook, (0, 0), (1, 0));
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sim.Sim.QuickSave();
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sim.Place(PieceKind.Rook, (0, 1), (1, 1));
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// Two undoable mutations so far — load clears the stack
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sim.Sim.QuickLoad();
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Assert.False(sim.Sim.CanUndo);
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}
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}
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