public void Flip_Should_Flip_From_Middle_When_Changing_Octave_Is_Not_Possible()
{
//Arrange
MidiService target = new MidiService();
Stream midiStream = File.Open($"{TestFilesPath}flip_from_middle_0_127.mid", FileMode.Open);
const int firstNote = 127;
const int secondNote = 64;
const int thirdNote = 63;
const int lastNote = 0;
//Act
Stream flippedMidiStream = target.Flip(midiStream, 0);
//Assert
MidiSequence flippedMidi = MidiSequence.Open(flippedMidiStream);
int firstFlippedNote = flippedMidi.Tracks[2].Events.OfType <OnNoteVoiceMidiEvent>().First().Note;
int secondFlippedNote = flippedMidi.Tracks[2].Events.OfType <OnNoteVoiceMidiEvent>().ElementAt(1).Note;
int thirdFlippedNote = flippedMidi.Tracks[2].Events.OfType <OnNoteVoiceMidiEvent>().ElementAt(2).Note;
int lastFlippedNote = flippedMidi.Tracks[2].Events.OfType <OnNoteVoiceMidiEvent>().Last().Note;
//Midi should be flipped around the middle
Assert.AreEqual(firstNote, lastFlippedNote);
Assert.AreEqual(secondNote, thirdFlippedNote);
Assert.AreEqual(thirdNote, secondFlippedNote);
Assert.AreEqual(firstFlippedNote, lastNote);
}
public void Flip_Should_Lower_Octave_When_Flipping_Above_127()
{
//Arrange
MidiService target = new MidiService();
Stream midiStream = File.Open($"{TestFilesPath}out_of_range_127.mid", FileMode.Open);
const int firstNote = 127;
const int lastNote = 115;
//Act
Stream flippedMidiStream = target.Flip(midiStream, 0);
//Assert
MidiSequence flippedMidi = MidiSequence.Open(flippedMidiStream);
int firstFlippedNote = flippedMidi.Tracks[2].Events.OfType <OnNoteVoiceMidiEvent>().First().Note;
int lastFlippedNote = flippedMidi.Tracks[2].Events.OfType <OnNoteVoiceMidiEvent>().Last().Note;
//Midi should be flipped while also having been lowered by one octave
Assert.AreEqual(firstNote, lastFlippedNote);
Assert.AreEqual(firstFlippedNote, lastNote);
}