Mailspring/packages/client-app/spec/async-test-spec.es6

const foo = () => {
  return new Promise((resolve) => {
    setTimeout(() => {
      console.log("---------------------------------- RESOLVING")
      resolve()
    }, 100)
  })
}

xdescribe("test spec", function testSpec() {
  // it("has 1 failure", () => {
  //   expect(false).toBe(true)
  // });

  it("is async", () => {
    const p = foo().then(() => {
      console.log("THEN")
      expect(true).toBe(true)
    })
    advanceClock(200);
    return p
  });

  // it("has another failure", () => {
  //   expect(false).toBe(true)
  // });
});