Espresso - typeText() not working correclty, sometimes letters are missing

Issue

I start my login activity and I use in Espresso test:

onView(withId(R.id.username)).perform(typeText("USERNAME"));

I expect the text in the field to be "USERNAME", but sometimes I get "SERNAME", others "UERNAME".

Most of the times it works but sometimes it fails, specially after rebooting the phone.

Here is the sample code to reproduce the bug: https://github.com/neoranga55/CleanGUITestArchitecture

Solution

The test phone uses Swift keyboard with double language typing enabled. Apparently this causes the first appearance of the keyboard after phone boot to be slow but also auto-correct in a weird way the first letters of a word typed by Espresso.

Solution: always use default system keyboard on testing device/emulator and make sure a software keyboard is enabled to avoid this other issue.

Answered By - Sebas LG