func context(named: String, block: (XCTActivity) throws -> (XCTWaiter.Result)) rethrows {
    _ = try XCTContext.runActivity(named: named, block: block)
}

class FavoriteListDataStoreTests: XCTestCase {
    func testSaveFavoriteList() {
        context(named: "") { activity -> XCTWaiter.Result in
            return .completed
        }
    }
}