UI tests on each Fragment Android -

i'd start implementing ui tests on each of fragments. have math formulas verify in each fragment. let's fragment have go fragment b , fragment c(i want test if each of fragment's c edittext text changes if button gets clicked). don't go throughout of passages arrive fragment c. i've installed espresso using gradle, after? please provide step step implementation. thank in advance.

maybe helpful: https://stackoverflow.com/a/27370190/7861694 or/if using espresso recommend second option - add unique id 1 element in fragment layout. https://developer.android.com/reference/android/r.id.html