message: testing setting ticks
diff: @@ -24,6 +24,14 @@ describe("TickSource", () => {
  source.dispose();
  });
  + it("can set ticks", () => {
  + const source = new TickSource();
  + expect(source.ticks).to.equal(0);
  + source.ticks = 10;
  + expect(source.ticks).to.equal(10);
  + source.dispose();
  + });
  +
  it("ticks increment at the rate of the frequency after started", () => {
  return Offline(() => {
  const source = new TickSource();
  