Update test_qexponential.py #22

Job	Run time
run_unit_tests (main, with-extras)	4m 28s
run_unit_tests (stable, with-extras)	3m 25s
run_unit_tests (stable, no-extras)	1m 44s
run_unit_tests (main, no-extras)	3m 55s
run_examples	7m 5s
	20m 37s

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