async isButtonsVisible() {
        const buttons = await $(this.rootElement).$$(BUTTON_SELECTOR);
        if (buttons && buttons.length) {
            return browser.waitUntil(
                async () => (await buttons[0].isDisplayed()) && (await buttons[1].isDisplayed()),
            );
        }
        return false;
    }
Returns true when buttons are visible.
@method
@returns {bool}