This line is about showing a snippet of the test when a test fails. We did this before but only for assertions.
I am afraid this change will not improve the qualify of the stacktrace itself.
If you run into a situation where the test report is less than ideal, please open up an issue so we can discuss if there is something that can be done about it.
[ExUnit] Show code snippet from test source file in case of test errors
ExUnit backtraces have historically been a bit hard to read sometimes IMHO.