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Added test for tile manager event deregistration to resolve Issue #8. #17

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Added test for tile manager event deregistration to resolve Issue #8. #17

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81 changes: 79 additions & 2 deletions Tests/Management/TileChangeManagerTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -161,8 +161,85 @@ public void TileChangeEvents()
[Test]
public void TileChangeEntityDestroyedDeregisterEvents()
{
// TODO: Issue 8 (https://github.com/Wizcorp/TileSystem/issues/8)
Assert.Fail();
// A tile manager should deregister an entity when it raises a Destroy event.

TileChangeManager manager = new TileChangeManager();

// Our mock entity should implement both IEntity (for raising Destroy) and IChangeTile (for performing movement)
Mock<IEntity> mockEntity = new Mock<IEntity>();
Mock<IChangeTile> mockMovable = mockEntity.As<IChangeTile>();

// Our mock creator is used only to create our mocked entity.
Mock<ICreateEntities> mockCreator = new Mock<ICreateEntities>();

// Two mocked tiles to move between
Mock<ITile> mockTileFrom = new Mock<ITile>();
Mock<ITile> mockTileTo = new Mock<ITile>();

// Our first mock solver will be checked to ensure it's receiving the events.
Mock<ISolver> mockSolverOne = new Mock<ISolver>();

// These tile change args classes will permit the solver to be invoked upon event propogation.
TileChangedArgs tileStartArgs = new TileChangedArgs(mockTileFrom.Object, mockTileTo.Object, TileChangeType.Start);
TileChangedArgs tileChangeArgs = new TileChangedArgs(mockTileFrom.Object, mockTileTo.Object, TileChangeType.Change);
TileChangedArgs tileFinishArgs = new TileChangedArgs(mockTileFrom.Object, mockTileTo.Object, TileChangeType.Finish);

// Our mocked movable entity should emit tile change start, changing, and finished events.
mockMovable.Setup(movable => movable.StartChangeTile(mockTileFrom.Object, mockTileTo.Object))
.Raises(m => m.ChangeStarted += null, mockMovable.Object, tileStartArgs);

mockMovable.Setup(movable => movable.ChangeTile(mockTileFrom.Object, mockTileTo.Object))
.Raises(m => m.Changing += null, mockMovable.Object, tileChangeArgs);

mockMovable.Setup(movable => movable.FinishChangeTile(mockTileFrom.Object, mockTileTo.Object))
.Raises(m => m.ChangeFinished += null, mockMovable.Object, tileFinishArgs);

// Register the entity creator with the tile manager.
manager.RegisterEntityCreator(mockCreator.Object);

// Our first solver must be added before it will receive events.
manager.Add(mockSolverOne.Object);

// Raise an entity creation event to register that entity for tile change events.
mockCreator.Raise(creator => creator.EntityCreated += null, mockCreator.Object, new EntityCreatedArgs(mockTileFrom.Object, mockEntity.Object));

// Move the entity.
mockMovable.Object.StartChangeTile(mockTileFrom.Object, mockTileTo.Object);
mockMovable.Object.ChangeTile(mockTileFrom.Object, mockTileTo.Object);
mockMovable.Object.FinishChangeTile(mockTileFrom.Object, mockTileTo.Object);

// The entity's movement should have invoked each corresponding state transition method once.
// Solver One has received one set of events.

// Add a second solver, for differential comparison.
Mock<ISolver> mockSolverTwo = new Mock<ISolver>();
manager.Add(mockSolverTwo.Object);

// Move the entity a second time.
mockMovable.Object.StartChangeTile(mockTileFrom.Object, mockTileTo.Object);
mockMovable.Object.ChangeTile(mockTileFrom.Object, mockTileTo.Object);
mockMovable.Object.FinishChangeTile(mockTileFrom.Object, mockTileTo.Object);

// The two solvers should have again incremented their movement method invocation count once each.
// Solver One has received two sets of events, Solver Two has received one set of events.

// Raise a Destroy event from the entity (via its IEntity mock), which should trigger deregistration.
mockEntity.Raise(movable => movable.Destroyed += null, new EntityDestroyedArgs(mockEntity.Object));

// Move the entity a third time.
mockMovable.Object.StartChangeTile(mockTileFrom.Object, mockTileTo.Object);
mockMovable.Object.ChangeTile(mockTileFrom.Object, mockTileTo.Object);
mockMovable.Object.FinishChangeTile(mockTileFrom.Object, mockTileTo.Object);

// Because the entity was deregistered, neither solver incremented its movement method invocation count.
// Solver One has received two sets of events, Solver Two has received one set of events.
// Should deregistration be faulty, we'd expect the invocation counts to stand at 3 and 2, repsectively.
mockSolverOne.Verify(solver => solver.Solve(mockEntity.Object, tileStartArgs), Times.Exactly(2));
mockSolverOne.Verify(solver => solver.Solve(mockEntity.Object, tileChangeArgs), Times.Exactly(2));
mockSolverOne.Verify(solver => solver.Solve(mockEntity.Object, tileFinishArgs), Times.Exactly(2));
mockSolverTwo.Verify(solver => solver.Solve(mockEntity.Object, tileStartArgs), Times.Exactly(1));
mockSolverTwo.Verify(solver => solver.Solve(mockEntity.Object, tileChangeArgs), Times.Exactly(1));
mockSolverTwo.Verify(solver => solver.Solve(mockEntity.Object, tileFinishArgs), Times.Exactly(1));
}

[Test]
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