diff --git a/test/all.js b/test/all.js
index c0a6053..aed5085 100644
--- a/test/all.js
+++ b/test/all.js
@@ -20,6 +20,110 @@ exports['test XM startup'] = function(assert) {
   assert.equal(XMPlayer.cur_row, 1, 'advance to row 1');
 };
 
+exports['test non-existing song position'] = function(assert) {
+  testdata.resetXMData();
+  // 2 existing patterns, 1 non-existing
+  XMPlayer.xm.songpats = [0, 1, 2]
+  // 1 channel, 1 row, 2 blank patterns
+  XMPlayer.xm.patterns = [
+    [[[-1, -1, -1, 0, 0]]],
+    [[[-1, -1, -1, 0, 0]]]
+  ];
+  XMPlayer.xm.tempo = 1;
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 0, 'advance to initial song position');
+  assert.equal(XMPlayer.cur_pat, 0, 'advance to pattern 0');
+  assert.equal(XMPlayer.cur_row, 1, 'advance to row 1');
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 1, 'advance to song position 1');
+  assert.equal(XMPlayer.cur_pat, 1, 'advance to pattern 1');
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 0, 'return to song position 0');
+  assert.equal(XMPlayer.cur_pat, 0, 'return to pattern 0');
+};
+
+exports['test non-existing first song position'] = function(assert) {
+  testdata.resetXMData();
+  // 2 existing patterns, 1 non-existing
+  XMPlayer.xm.songpats = [2, 0, 1]
+  // 1 channel, 1 row, 2 blank patterns
+  XMPlayer.xm.patterns = [
+    [[[-1, -1, -1, 0, 0]]],
+    [[[-1, -1, -1, 0, 0]]]
+  ];
+  XMPlayer.xm.tempo = 1;
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 1, 'advance to song position 1');
+  assert.equal(XMPlayer.cur_pat, 0, 'advance to pattern 0');
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 2, 'advance to song position 2');
+  assert.equal(XMPlayer.cur_pat, 1, 'advance to pattern 1');
+};
+
+exports['test multiple non-existing song positions'] = function(assert) {
+  testdata.resetXMData();
+  // 2 existing patterns, 2 non-existing
+  XMPlayer.xm.songpats = [2, 0, 3, 1]
+  // 1 channel, 1 row, 2 blank patterns
+  XMPlayer.xm.patterns = [
+    [[[-1, -1, -1, 0, 0]]],
+    [[[-1, -1, -1, 0, 0]]]
+  ];
+  XMPlayer.xm.tempo = 1;
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 1, 'advance to song position 1');
+  assert.equal(XMPlayer.cur_pat, 0, 'advance to pattern 0');
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 3, 'advance to song position 3');
+  assert.equal(XMPlayer.cur_pat, 1, 'advance to pattern 1');
+};
+
+exports['test non-existing song position with loop'] = function(assert) {
+  testdata.resetXMData();
+  // 2 existing patterns, 1 non-existing
+  XMPlayer.xm.songpats = [0, 1, 2]
+  // 1 channel, 1 row, 2 blank patterns
+  XMPlayer.xm.patterns = [
+    [[[-1, -1, -1, 0, 0]]],
+    [[[-1, -1, -1, 0, 0]]]
+  ];
+  XMPlayer.xm.song_looppos = 1;
+  XMPlayer.xm.tempo = 1;
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 0, 'advance to initial song position');
+  assert.equal(XMPlayer.cur_pat, 0, 'advance to pattern 0');
+  assert.equal(XMPlayer.cur_row, 1, 'advance to row 1');
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 1, 'advance to song position 1');
+  assert.equal(XMPlayer.cur_pat, 1, 'advance to pattern 1');
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 1, 'replay song position 1');
+  assert.equal(XMPlayer.cur_pat, 1, 'replay pattern 1');
+};
+
+exports['test non-existing song position with invalid loop'] = function(assert) {
+  testdata.resetXMData();
+  // 2 existing patterns, 1 non-existing
+  XMPlayer.xm.songpats = [0, 1, 2]
+  // 1 channel, 1 row, 2 blank patterns
+  XMPlayer.xm.patterns = [
+    [[[-1, -1, -1, 0, 0]]],
+    [[[-1, -1, -1, 0, 0]]]
+  ];
+  XMPlayer.xm.song_looppos = 4;
+  XMPlayer.xm.tempo = 1;
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 0, 'advance to initial song position');
+  assert.equal(XMPlayer.cur_pat, 0, 'advance to pattern 0');
+  assert.equal(XMPlayer.cur_row, 1, 'advance to row 1');
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 1, 'advance to song position 1');
+  assert.equal(XMPlayer.cur_pat, 1, 'advance to pattern 1');
+  XMPlayer.nextTick();
+  assert.equal(XMPlayer.cur_songpos, 0, 'return to song position 0');
+  assert.equal(XMPlayer.cur_pat, 0, 'return to pattern 0');
+};
+
 exports['test instruments'] = require('./instrument.js');
 exports['test effects'] = require('./effects.js');