F                                                                        [100%]
=================================== FAILURES ===================================
____________________________________ test_b ____________________________________
test_sl.py:5: in test_b
    boom()
helpers.py:2: in boom
    raise RuntimeError('see app.py:12 for details\nsecond line\nthird line')  # app.py:12
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
E   RuntimeError: see app.py:12 for details
E   second line
E   third line
1 failed in 0.01s
