public void Search_Diagonal_Downward(string word)
{
// Arrange
List <XY> expectedPoints = new List <XY>
{
new XY(2, 1),
new XY(3, 2),
new XY(4, 3),
new XY(5, 4),
new XY(6, 5)
};
// Act
WordSearch wordSearch = new WordSearch(GetMatrix());
var actualPoints = wordSearch.DiagonalDownwardSearch(word);
XYComparer xYComparer = new XYComparer();
// Assert
CollectionAssert.AreEqual(expectedPoints, actualPoints, xYComparer);
}