Function styleCount

packages/platform-browser/test/dom/dom_renderer_spec.ts:664–683

(
  fixture: ComponentFixture<unknown>,
  cssContentMatcher: string,
)

});

async function styleCount(
  fixture: ComponentFixture<unknown>,
  cssContentMatcher: string,
): Promise<number> {
  // flush
  await new Promise<void>((resolve) => {
    setTimeout(() => resolve(), 0);
  });

  const html = fixture.debugElement.parent?.parent;
  const debugElements = html?.queryAll(By.css('style'));

  if (!debugElements) {
    return 0;
  }

  return debugElements.filter(({nativeElement}) =>
    nativeElement.textContent.includes(cssContentMatcher),
  ).length;
}

@Component({
  selector: 'cmp-emulated',