gistfile1.txt

//Intervals
        let C0 = MusicPitch(name: .c, accidental: .natural, octave: 0)
        let D0 = MusicPitch(name: .d, accidental: .natural, octave: 0)

        let majorSecond = try MusicInterval(rootPitch: C0, destinationPitch: D0)
        XCTAssertEqual(majorSecond.halfStepDistance, 2)
        XCTAssertEqual(majorSecond.quality, MusicIntervalQuality.major)
        XCTAssertEqual(majorSecond.quantity, MusicIntervalQuantity.second)

//Scales
  let root = MusicPitch(name: .d, accidental: .natural, octave: 0)
  let scale = MusicScale(root: root, mode: .harmonicMinor)
  let dMinor = [root,
                MusicPitch(name: .e, accidental: .natural, octave: 0),
                MusicPitch(name: .f, accidental: .natural, octave: 0),
                MusicPitch(name: .g, accidental: .natural, octave: 0),
                MusicPitch(name: .a, accidental: .natural, octave: 0),
                MusicPitch(name: .b, accidental: .flat, octave: 0),
                MusicPitch(name: .c, accidental: .sharp, octave: 1)]