--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test_audio.nim	Mon May 01 01:16:59 2023 +0700
@@ -0,0 +1,94 @@
+import std/sequtils
+import std/times
+
+import semicongine
+
+proc test1() =
+  var mixer = initMixer()
+  mixer.addSound("test1", newSound(sineSoundData(1000, 2)))
+  mixer.addSound("test2", newSound(sineSoundData(500, 2)))
+
+
+  let s1 = mixer.play("test1", loop=true)
+  let s2 = mixer.play("test2", loop=true)
+
+  let t0 = now()
+  while true:
+    mixer.updateSoundBuffer()
+    let runtime = (now() - t0).inMilliseconds()
+    if runtime > 1500:
+      mixer.setLevel(0.1)
+    if runtime > 3000:
+      mixer.stop(s2)
+    if runtime > 6000:
+      mixer.stop("")
+    if runtime > 8000:
+      mixer.stop()
+      break
+  mixer.destroy()
+
+proc test2() =
+  let
+    # notes
+    c = sineSoundData(261.6256, 0.5)
+    d = sineSoundData(293.6648, 0.5)
+    e = sineSoundData(329.6276, 0.5)
+    f = sineSoundData(349.2282, 0.5)
+    g = sineSoundData(391.9954, 0.5)
+    a = sineSoundData(440.0000, 0.5)
+    b = sineSoundData(493.8833, 0.5)
+    bb = sineSoundData(466.1638, 0.5)
+    c2 = sineSoundData(523.2511, 0.5)
+    d2 = sineSoundData(587.3295, 0.5)
+    bbShort = sineSoundData(466.1638, 0.25)
+    c2Short = sineSoundData(523.2511, 0.25)
+    d2Short = sineSoundData(587.3295, 0.25)
+
+    # song
+    frerejaquesData = concat(
+      f, g, a, f,
+      f, g, a, f,
+      a, bb, c2, c2,
+      a, bb, c2, c2,
+      c2Short, d2Short, c2Short, bbShort, a, f,
+      c2Short, d2Short, c2Short, bbShort, a, f,
+      f, c, f, f,
+      f, c, f, f,
+    )
+
+  var mixer = initMixer()
+  mixer.addSound("frerejaques", newSound(frerejaquesData))
+  discard mixer.play("frerejaques", loop=true)
+
+  let t0 = now()
+  while true:
+    mixer.updateSoundBuffer()
+    if (now() - t0).inMilliseconds() > 20000:
+      break
+  mixer.destroy()
+
+proc test3() =
+
+  var song: SoundData
+  var f = open("tests/audiotest.PCM.s16le.48000.2")
+  var readLen = 999
+  while readLen > 0:
+    var sample: Sample
+    readLen = f.readBuffer(addr sample, sizeof(Sample))
+    song.add sample
+
+  var mixer = initMixer()
+  mixer.addSound("pianosong", newSound(song))
+  discard mixer.play("pianosong", loop=true)
+
+  let t0 = now()
+  while true:
+    mixer.updateSoundBuffer()
+    if (now() - t0).inMilliseconds() > 190_000:
+      break
+  mixer.destroy()
+
+when isMainModule:
+  test1()
+  test2()
+  test3()