Looking at your test cases, some of them return False yet ideally they should return True. Casing point, Test case 1 "sumo", "omo" and test case 4 "ails", "fails".
These instances should return True. I dont understand why they return False. From the instructions, the last 2 characters of the text should end with the 2nd argument().
It's either the test cases are wrong or the instructions are not clear.

The test cases seem to have a bug. They're not consistent