How to use the gaiatest.apps.camera.app.Camera function in gaiatest

def tap_camera(self):
        actions_menu = Wait(self.marionette).until(
            expected.element_present(*self._actions_menu_locator))
        Wait(self.marionette).until(
            expected.element_displayed(actions_menu))
        self.marionette.find_element(*self._camera_button_locator).tap()
        Wait(self.marionette).until(
            expected.element_not_displayed(actions_menu))
        from gaiatest.apps.camera.app import Camera
        camera = Camera(self.marionette)
        camera.wait_to_be_displayed()
        self.apps.switch_to_displayed_app()
        camera.wait_for_capture_ready()
        return camera

def switch_to_camera(self):
        switch_to_camera_button = self.marionette.find_element(*self._switch_to_camera_button_locator)
        switch_to_camera_button.tap()
        camera_app = gaiatest.apps.camera.app.Camera(self.marionette)
        Wait(self.marionette).until(lambda m: self.apps.displayed_app.name == camera_app.name)
        self.apps.switch_to_displayed_app()
        return camera_app

def unlock_to_camera(self):
        Wait(self.marionette).until(expected.element_displayed(*self._lockscreen_handle_locator))
        self._slide_to_unlock('camera')
        return Camera(self.marionette)

def tap_switch_to_camera(self):
        self.marionette.find_element(*self._camera_locator).tap()
        from gaiatest.apps.camera.app import Camera
        camera_app = Camera(self.marionette)
        camera_app.wait_to_be_displayed()
        self.apps.switch_to_displayed_app()
        camera_app.wait_for_capture_ready()
        Wait(self.marionette).until(expected.element_not_displayed(*self._loading_screen_locator))
        return camera_app

def a11y_click_camera_button(self):
        self.accessibility.click(self.marionette.find_element(*self._camera_button_locator))
        return Camera(self.marionette)

def tap_camera(self):
        self.marionette.find_element(*self._camera_button_locator).tap()
        from gaiatest.apps.camera.app import Camera
        camera = Camera(self.marionette)
        camera.switch_to_camera_frame()
        return camera