Add total frames test

lib/music_theory/note.rb

@@ -1,3 +1,4 @@
+# coding: utf-8
 require 'music_theory/output'
 
 module MusicTheory

test/note_test.rb

@@ -0,0 +1,13 @@
+require 'test_helper'
+
+class TestNote < MiniTest::Test
+ def setup
+ @note_1 = MusicTheory::Note.new(frequency: 220, duration: 2.0)
+ end
+
+ def test_total_frames
+ sample_rate = 22050
+ frames = (2.0 * sample_rate).to_i
+ assert_equal frames, @note_1.total_frames
+ end
+end