tests: move token expiration tests in their own file #781

Job	Run time
doc	1m 25s
style	26s
minimum dependency versions	4m 7s
3.12	3m 20s
3.11	3m 29s
3.10	3m 46s
3.9	3m 40s
3.8	3m 46s
	23m 59s

Provide feedback