public void NoteChoiceGenerator_Generates_Unique_Note_Choices(
ISet <Voice> chosenVoices,
int expectedNoteChoiceCount)
{
// arrange
var noteChoiceGenerator = new NoteChoiceGenerator(_mockVoiceNoteChoiceRepository);
// act
var noteChoices = noteChoiceGenerator.GetNoteChoices(chosenVoices);
var otherNoteChoices = noteChoiceGenerator.GetNoteChoices(chosenVoices);
// assert
_mockVoiceNoteChoiceRepository.ReceivedWithAnyArgs(chosenVoices.Count).GetVoiceNoteChoices(default);