really basic test runner

npm test now does... something somewhat useful.

now to write a bunch of tests.

test/all.js

@@ -0,0 +1,82 @@
+window = {};
+
+require('../xm.js', window);
+require('../xmeffects.js', window);
+
+var XMPlayer = window.XMPlayer;
+
+// set up basic blank single-channel, single-pattern XM
+function ResetXMData() {
+  var xm = {};
+  window.XMPlayer.xm = xm;
+  xm.channelinfo = [];
+  xm.songname = "test song";
+  xm.song_looppos = 0;
+  xm.nchan = 1;
+  xm.flags = 1;
+  xm.tempo = 3;
+  xm.bpm = 125;
+  xm.channelinfo.push({
+    number: 0,
+    filterstate: new Float32Array(3),
+    vol: 0,
+    pan: 128,
+    period: 1920 - 48*16,
+    vL: 0, vR: 0,
+    vLprev: 0, vRprev: 0,
+    mute: 0,
+    volE: 0, panE: 0,
+    retrig: 0,
+    vibratodepth: 1,
+    vibratospeed: 1,
+  });
+  xm.songpats = [0];
+  // 1 channel, 2 row blank pattern
+  xm.patterns = [
+    [[[-1, -1, -1, 0, 0]]],
+    [[[-1, -1, -1, 0, 0]]]];
+  xm.instruments = [];
+  xm.instruments.push({
+    'name': "test instrument",
+    'number': 0,
+    'samples': [
+      { 'len': 256, 'loop': 0,
+        'looplen': 256, 'note': 0, 'fine': 0,
+        'pan': 128, 'type': 0, 'vol': 64,
+        'sampledata': new Float32Array(256)
+      }
+    ],
+    'samplemap': new Uint8Array(96),
+    'env_vol': new XMPlayer.Envelope([0, 64, 1, 0], 2, 0, 0, 0),
+    'env_pan': new XMPlayer.Envelope([0, 32], 0, 0, 0, 0)
+  });
+  // reset song position
+  XMPlayer.cur_songpos = -1;
+  XMPlayer.cur_pat = -1;
+  XMPlayer.cur_tick = xm.tempo;
+  return xm;
+}
+
+// using assert passed to the test function that just logs failures 
+exports['test XM startup'] = function(assert) {
+  ResetXMData();
+  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_tick, 0, 'advance to tick 0');
+  assert.equal(XMPlayer.cur_row, 1, 'advance to row 1');
+};
+
+exports['test note on'] = function(assert) {
+  var xm = ResetXMData();
+  // [row][column][channel]
+  xm.patterns[0][0][0] = [48, 1, 0x10 + 33, 0, 0];  // C-4  1 40 000
+  XMPlayer.nextTick();
+  var ch = xm.channelinfo[0];
+  assert.equal(ch.note, 48, 'set note');
+  assert.equal(ch.period, 1152, 'channel period');
+  assert.equal(ch.vol, 33, 'channel volume');
+  assert.equal(ch.samp, xm.instruments[0].samples[0], 'set sample');
+};
+
+if (module == require.main) require('test').run(exports);