Merge https://github.com/0xfe/vexflow

tests/run.ts

@@ -57,6 +57,7 @@ import { TextNoteTests } from './textnote_tests';
 import { ThreeVoicesTests } from './threevoice_tests';
 import { TickContextTests } from './tickcontext_tests';
 import { TimeSignatureTests } from './timesignature_tests';
+import { TremoloTests } from './tremolo_tests';
 import { TuningTests } from './tuning_tests';
 import { TupletTests } from './tuplet_tests';
 import { TypeGuardTests } from './typeguard_tests';
@@ -124,6 +125,7 @@ VexFlowTests.run = function () {
   ThreeVoicesTests.Start();
   TickContextTests.Start();
   TimeSignatureTests.Start();
+  TremoloTests.Start();
   TuningTests.Start();
   TupletTests.Start();
   TypeGuardTests.Start();

tests/tremolo_tests.ts

@@ -0,0 +1,55 @@
+// [VexFlow](http://vexflow.com) - Copyright (c) Mohit Muthanna 2010.
+// MIT License
+//
+// Tremolo Tests
+
+import { TestOptions, VexFlowTests } from './vexflow_test_helpers';
+import { Barline } from 'stavebarline';
+import { Tremolo } from 'tremolo';
+
+const TremoloTests = {
+  Start(): void {
+    QUnit.module('Tremolo');
+    const run = VexFlowTests.runTests;
+    run('Tremolo - Basic', tremoloBasic);
+  },
+};
+
+function tremoloBasic(options: TestOptions): void {
+  const f = VexFlowTests.makeFactory(options, 600, 200);
+  const score = f.EasyScore();
+
+  // bar 1
+  const stave1 = f.Stave({ width: 250 }).setEndBarType(Barline.type.DOUBLE);
+
+  const notes1 = score.notes('e4/4, e4, e4, e4', { stem: 'up' });
+
+  notes1[0].addModifier(new Tremolo(3));
+  notes1[1].addModifier(new Tremolo(2));
+  notes1[2].addModifier(new Tremolo(1));
+
+  const voice1 = score.voice(notes1);
+
+  f.Formatter().joinVoices([voice1]).formatToStave([voice1], stave1);
+
+  // bar 2
+  const stave2 = f
+    .Stave({ x: stave1.getWidth() + stave1.getX(), y: stave1.getY(), width: 300 })
+    .setEndBarType(Barline.type.DOUBLE);
+
+  const notes2 = score.notes('e5/4, e5, e5, e5', { stem: 'down' });
+
+  notes2[1].addModifier(new Tremolo(1));
+  notes2[2].addModifier(new Tremolo(2));
+  notes2[3].addModifier(new Tremolo(3));
+
+  const voice2 = score.voice(notes2);
+
+  f.Formatter().joinVoices([voice2]).formatToStave([voice2], stave2);
+
+  f.draw();
+
+  ok(true, 'Tremolo - Basic');
+}
+
+export { TremoloTests };