async create(Clazz, args) {
			// ensure the custom element is defined
			await window.customElements.whenDefined(Clazz.getMetadata().getTag());

			const instance = new Clazz(args);
			_pool.add(instance);
			return instance;
		}
Tracks wrapper control instances.
Easy cleanup of test instances after each webc test.
Takes care of awaiting the next rendering after destroying all instances.