public void ReturnsSingleDigitCombinations(string input, IEnumerable <string> expected)
{
var target = new TextPredictor();
var actual = target.GetLetterCombinations(input);
Assert.Equal(expected, actual);
}
public void ReturnsBabyGotBack()
{
const string expected = "mixalot";
var target = new TextPredictor();
var actual = target.GetLetterCombinations("6492568");
Assert.Contains(expected, actual);
}
public void ReturnsExampleDoubleDigitCombinations()
{
var expected = new[] { "ad", "ae", "af", "bd", "be", "bf", "cd", "ce", "cf" };
var target = new TextPredictor();
var actual = target.GetLetterCombinations("23");
Assert.Equal(expected, actual);
}
public void RejectsNullInput()
{
var target = new TextPredictor();
Assert.Throws <ArgumentNullException>(() => target.GetLetterCombinations(null));
}
public void RejectsOutOfRangeInput()
{
var target = new TextPredictor();
Assert.Throws <FormatException>(() => target.GetLetterCombinations("cat"));
}
