Here is an example:
The URL under test is https://bakery-flow-spring-perf.app.fi/login
When run with the default settings the tests end at around 2 seconds while the JS evaluation is still going on.
Full test report: https://www.webpagetest.org/result/180105_AS_2d77ddc0fdd1dfc37b78582f19fa774e/
When run with minimum test running time set to 10 seconds (as suggested in another thread on this forum) the results are as expected.
Full test report: https://www.webpagetest.org/result/180105_WY_80fadcdb5d761a9486e593d0e3527682/