public IEnumerable <WordCombination> FindAllPossibleCombinationsOfLength(IWordsIndex wordsIndex, int desiredLength)
{
if (wordsIndex == null)
{
throw new ArgumentNullException(nameof(wordsIndex));
}
if (desiredLength < 1)
{
throw new ArgumentOutOfRangeException(nameof(desiredLength));
}
return(Enumerable
.Range(1, desiredLength - 1)
.SelectMany(i => wordsIndex.GetWordsOfLength(i)
.SelectMany(word => wordsIndex.GetWordsOfLength(desiredLength - i)
.Select(otherWord => new WordCombination(word, otherWord)))));
}
public void SetUp()
{
_desiredLength = 6;
_allWords = new[] {
new Word("albums"),
new Word("al"),
new Word("u"),
new Word("ticket"),
new Word("foul"),
new Word("be"),
new Word("befoul"),
new Word("magazine"),
new Word("bums"),
new Word("trump")
};
_wordsIndex = new FakeWordsIndex(_allWords);
_sut = new AllPossibleCombinationsFinder();
}