TestHealthCheck closed the app's server, and later smallwebwaf, and
expected connections to the freed ports to fail. Another test could take
such a port in between, so the connection succeeded and the test failed.
The failing app check now uses the multicast address 224.0.0.1, to which
TCP cannot connect. The failing smallwebwaf check uses port 0, on which
nothing listens. Neither result depends on other processes. The test now
stops smallwebwaf after its last check, so that it exits before the
test's temporary directories are removed. The code under test is
unchanged.
Model: opus-5-5
sneak