fieldDispatchesCountOnFirstPaint = (tagname, count) => {
  const tag = unsafeStatic(tagname);
  const spy = sinon.spy();
  it(getFirstPaintTitle(count), async () => {
    await fixture(html`<${tag} @model-value-changed="${spy}"></${tag}>`);
    expect(spy.callCount).to.equal(count);
  });
}
@param {string} tagname
@param {number} count