In select method, we have this code: http://mxr.mozilla.org/gaia/source/tests/python/gaia-ui-tests/gaiatest/apps/base.py#105 106 # cheeky Select wrapper until Marionette has its own 107 # due to the way B2G wraps the app's select box we match on text 108 _close_button_locator = (By.CSS_SELECTOR, 'button.value-option-confirm') 109 110 li = self.find_select_item(match_string) 111 li.tap() 112 113 # Tap close and wait for it to hide 114 if tap_close: 115 self.marionette.find_element(*_close_button_locator).tap() 116 self.wait_for_select_closed(*_close_button_locator) This is potentially prone to failures, because this is closing the select dialog and when this also causes the displayed app to close, then Marionette will spew out NoSuchWindowException errors when calling something like self.apps.displayed_app.name. Immediately calling self.apps.switch_to_displayed_app() seems to paper over the issue often, but I think this can also cause failures (intermittent), so we should use existing workaround method here. Like we do here: http://mxr.mozilla.org/gaia/source/tests/python/gaia-ui-tests/gaiatest/apps/contacts/regions/contact_form.py#207 207 # Workaround for bug 1109213, where tapping on the button inside the app itself 208 # makes Marionette spew out NoSuchWindowException errors 209 element = self.marionette.find_element(*self._done_button_locator) 210 x = element.rect['x'] + element.rect['width']//2 211 y = element.rect['y'] + element.rect['height']//2 212 self.marionette.switch_to_frame() 213 statusbar = self.marionette.find_element(*self._statusbar_locator) 214 self.marionette.find_element(*self._screen_locator).tap(x, y + statusbar.rect['height']) 215 216 self.apps.switch_to_displayed_app() It's not ideal, because we're switching context, so we need to make sure this wouldn't somehow break existing tests, I guess. The same goes for http://mxr.mozilla.org/gaia/source/tests/python/gaia-ui-tests/gaiatest/apps/base.py#118 There is also this weird wait_for_select_closed method, that probably needs to be take care of too: http://mxr.mozilla.org/gaia/source/tests/python/gaia-ui-tests/gaiatest/apps/base.py#93
This is a problem in test_rocketbar_add_collection_save_bookmark.py
I tested this with an alarm test and with test_rocketbar_add_collection_save_bookmark.py, but I couldn't reproduce this issue, so I think this is invalid.