SDL2 mixer example

gistfile1.txt

import ctypes
import unittest
import time
import os.path
from sdl2 import *
from sdl2.sdlmixer import *


class MixerTests(unittest.TestCase):

  def test_mixer(self):

    if SDL_Init(SDL_INIT_VIDEO) != 0:
      print(SDL_GetError())
      return -1

    if Mix_Init(MIX_INIT_MP3) == -1:
      print(Mix_GetError())
      return -1

    if Mix_OpenAudio(22050, MIX_DEFAULT_FORMAT, 2, 1024) == -1:
      print(Mix_GetError())
      return -1

    window = SDL_CreateWindow(b"Text", SDL_WINDOWPOS_UNDEFINED,
                              SDL_WINDOWPOS_UNDEFINED, 100, 100,
                              SDL_WINDOW_SHOWN)
    if not window:
      print(SDL_GetError())
      return -1

    Mix_AllocateChannels(0)
    sound = Mix_LoadMUS(b"assets/song2.mp3")
    try:
      sound.contents
    except ValueError:
      print(Mix_GetError())
      return -1

    if Mix_PlayMusic(sound, 1) == -1:
      print(Mix_GetError())
      return -1

    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED)

    event = SDL_Event()
    running = True
    start_time = time.time()
    while running:
      while SDL_PollEvent(ctypes.byref(event)) != 0:
        if event.type == SDL_QUIT:
          running = False

      if time.time() - start_time > 1:
        running = False

    Mix_FreeMusic(sound)
    SDL_DestroyRenderer(renderer)
    SDL_DestroyWindow(window)
    Mix_CloseAudio()
    Mix_Quit()
    SDL_Quit()


if __name__ == "__main__":
  unittest.main()

Thanks for sharing but it's not actually testing anything about actual playing because there are no assertions.
Errors are intercepted but do not make the test fail. I have the test passing with 'unrecognised music format' error.