By using `Ctrl+\ ` to shutdown the VM, ExUnit will
intercept the sigquit signal and print the tests
currently running. This can be used to see which
test is stuck in a long running test suite:
$ mix test
.^\
Aborting test suite, the following have not completed:
* test greets the world [test/example_test.exs:5]
* AnotherTest [test/another_test.exs]
Showing results so far...
1 doctest, 0 failures
Randomized with seed 825614
As shown above, we also include a summary of the run
so far, alongside the seed and failure reports.