public void JoinsThousandsToTensAndUnits()
 {
     IEnumerable<HundredGroup> numberGroups = new[] { new HundredGroup(0), new HundredGroup(1), new HundredGroup(1) };
     var converters = GetConverters();
     var resultsCalculator = new ResultsCalculator(numberGroups, converters, numberDescriber);
     var results = resultsCalculator.CalculateResults();
     Assert.That(results.ElementAt(1), Is.EqualTo("and"));
 }
 private static void AssertResultIs(string result, ResultsCalculator resultsCalculator)
 {
     var results = resultsCalculator.CalculateResults();
     Assert.That(results.Count(), Is.EqualTo(1));
     Assert.That(results.First(), Is.EqualTo(result));
 }