public void UndoSingleStepSolutionsWhichReturnsEliminations_UndoesEliminations_Test()
{
var sudoku = (int[, ])_sudoku.Clone();
sudoku[4, 7] = 0;
var sudokuPuzzle = new SudokuPuzzle(sudoku);
var strategyWhichReducesCandidates = new BasicElimination();
sudokuPuzzle.ApplySingleStepSolution(strategyWhichReducesCandidates.SolveSingleStep(sudokuPuzzle));
Assert.That(sudokuPuzzle.Cells[4, 7].CanBe.Single(), Is.EqualTo(5));
var step = sudokuPuzzle.UndoLastSingleStepSolution();
Assert.That(step.Eliminations, Is.Not.Empty);
Assert.That(step.Result, Is.Null);
Assert.That(step.Strategy, Is.EqualTo(strategyWhichReducesCandidates.StrategyName));
Assert.That(step.SolutionDescription, Is.Not.Empty);
CollectionAssert.AreEqual(sudokuPuzzle.Cells[4, 7].CanBe, new[] { 1, 2, 3, 4, 5, 6, 7, 8, 9 });
}
public void UndoSingleStepSolutionsWhichReturnsResult_UndoesResult_Test()
{
var sudoku = (int[, ])_sudoku.Clone();
sudoku[4, 7] = 0;
var sudokuPuzzle = new SudokuPuzzle(sudoku);
var strategyWhichFindsResult = new HiddenSingle();
sudokuPuzzle.ApplySingleStepSolution(strategyWhichFindsResult.SolveSingleStep(sudokuPuzzle));
Assert.That(sudokuPuzzle.Cells[4, 7].Value, Is.EqualTo(5));
var step = sudokuPuzzle.UndoLastSingleStepSolution();
Assert.That(step.Eliminations, Is.Null);
Assert.That(step.Result, Is.Not.Null);
Assert.That(step.Result.IndexOfRow, Is.EqualTo(4));
Assert.That(step.Result.IndexOfColumn, Is.EqualTo(7));
Assert.That(step.Strategy, Is.EqualTo(strategyWhichFindsResult.StrategyName));
Assert.That(step.SolutionDescription, Is.Not.Empty);
Assert.That(sudokuPuzzle.Cells[4, 7].Value, Is.EqualTo(0));
}
public void UndoLastSingleStepSolution_WhenNoSolutionWasApplied_ReturnsNull_Test()
{
var sudokuPuzzle = new SudokuPuzzle(_sudoku);
Assert.That(sudokuPuzzle.UndoLastSingleStepSolution(), Is.Null);
}