public void Test3()
{
// Arrange
var digits = "2";
// Act
var result = new Solution2().LetterCombinations(digits);
// Assert
CollectionAssert.AreEquivalent(new[] { "a", "b", "c" }, result);
}
public void Test1()
{
// Arrange
var digits = "23";
// Act
var result = new Solution2().LetterCombinations(digits);
// Assert
CollectionAssert.AreEquivalent(new[] { "ad", "ae", "af", "bd", "be", "bf", "cd", "ce", "cf" }, result);
}
public void Test2()
{
// Arrange
var digits = "";
// Act
var result = new Solution2().LetterCombinations(digits);
// Assert
Assert.IsEmpty(result);
}