internal void Enumerates_the_source_n_times(
[Frozen] IEnumerable <int> source,
[Frozen] InfiniteLoopingEnumerator <int> enumerator,
int n)
{
var result = enumerator.AsEnumerable()
.Take(source.Count() * n);
result.Should().BeEquivalentTo(
source.Multiply(times: n));
}
public int GetFirstFrequencyReachedTwice(string frequencyChangesAsString)
{
var frequencyChanges = Split(frequencyChangesAsString);
var parsed = frequencyChanges.Select(ParseFrequencyChange);
using (var infiniteLoopingEnumerator = new InfiniteLoopingEnumerator <int>(parsed))
{
var looping = infiniteLoopingEnumerator.AsEnumerable();
var reached = GetReachedFrequencies(looping);
return(GetFirstReachedTwice(reached));
}
}
