Add test for samples

test/note_test.rb

@@ -5,21 +5,31 @@ def setup
  @frequency = 220.to_f
  @duration = 2.0
  @sample_rate = 22050
+ @total_frames = (@duration * @sample_rate).to_i
  @cycles_per_frame = @frequency / @sample_rate
+ @sine_wave_cycle = 2 * Math::PI * @cycles_per_frame
  @note = MusicTheory::Note.new(frequency: @frequency, duration: @duration)
  end
 
  def test_total_frames
- frames = (@duration * @sample_rate).to_i
- assert_equal frames, @note.total_frames
+ assert_equal @total_frames, @note.total_frames
  end
 
  def test_cycles_per_frame
  assert_equal @cycles_per_frame, @note.cycles_per_frame
  end
 
  def test_sine_wave_cycle
- sine_wave_cycle = 2 * Math::PI * @cycles_per_frame
- assert_equal sine_wave_cycle, @note.sine_wave_cycle
+ assert_equal @sine_wave_cycle, @note.sine_wave_cycle
+ end
+
+ def test_samples
+ phase = 0
+ samples = @total_frames.times.map do
+ sample = (Math.sin phase).to_f
+ phase += @sine_wave_cycle
+ sample
+ end
+ assert_equal samples, @note.samples
  end
 end