Unit tests have an implicit dependency on "example.com"

"example.com" is a real webserver on the public Internet, and is actually relatively well-behaved. But any tests that use it are implicitly making it a third-party dependency, and in cases where firewalls, etc. make it unreachable, unit tests will fail.

Steps to Reproduce:

    sudo ip route add unreachable `host example.com | awk '/has address/ {print $NF "/32"}'`
    tox

    sudo ip route del unreachable `host example.com | awk '/has address/ {print $NF "/32"}'`
    tox

Expected Results:

Both tests pass

Actual Results:

The first set of tests fails