function fixtureCleanup() {
  if (cachedWrappers) {
    cachedWrappers.forEach(wrapper => {
      document.body.removeChild(wrapper);
    });
  }
  cachedWrappers.length = 0; // reset it like this as we can't reassign it
}
Cleans up all defined fixtures by removing the actual wrapper nodes.
Common usecase is at the end of each test.