test("should emit a custom element with an attribute binding when the attr binding returns a string", () => {
        const { templateRenderer } = fastSSR();
        const result = templateRenderer.render(html`<hello-world my-attr=${x => "foobar"}></hello-world>`)

        expect(consolidate(result)).toBe(`<hello-world  my-attr="foobar"><template shadowrootmode=\"open\"></template></hello-world>`);