Bug 930932 - [v1.2] Write a test to use the Keyboard's predictive text

The test on aurora fails on this step: keyboard = keyboard_page.tap_text_input().
This method is used two times. The element is tapped first time we use the method, but it is not tapped second time, even though the locator is the right one. Does it has anything to do with the fact that we use switch_to_frame before tapping the element? 
Please run this test on your device and let me know if you find the same issue. Thanks!