public void GetUnsetNeighbors_WithAnyVariable_ReturnsUnsetVariablesInRowColumnAndSquare()
{
// Arrange
var grid = new SudokuGrid(FullGrid());
var variable = grid[4, 5];
var expectedVariables = new Variable[]
{
grid[4, 6], // same row
grid[1, 5], // same column
grid[3, 3], // same square
grid[5, 5] // same column and square
};
foreach (var neighbor in expectedVariables)
{
neighbor.Unset();
}
// Act
var unsetNeighbors = new List <Variable>(grid.GetUnsetNeighbors(variable));
// Assert
CollectionAssert.AreEquivalent(expectedVariables, unsetNeighbors);
}
public void GetUnsetNeighbors_VariableIsUnset_ScreensOutVariable()
{
// Arrange
var grid = new SudokuGrid(FullGrid());
var variable = grid[0, 2];
variable.Unset();
var neighbors = new Variable[]
{
grid[0, 5], // same row
grid[3, 2], // same column
grid[1, 0], // same square
grid[2, 2] // same column and square
};
foreach (var neighbor in neighbors)
{
neighbor.Unset();
}
// Act
var unsetNeighbors = new List <Variable>(grid.GetUnsetNeighbors(variable));
// Assert
CollectionAssert.DoesNotContain(unsetNeighbors, variable);
}
public void GetUnsetNeighbors_WithNullVariable_ThrowsArgumentNullException()
{
// Arrange
var grid = new SudokuGrid(AnyInitialValues());
// Act
Action action = () =>
{
grid.GetUnsetNeighbors(null);
};
// Assert
Assert.ThrowsException <ArgumentNullException>(action);
}
