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The integration tests depend on having a DNS server that resolves "localhost", which is unfortunate but currently unavoidable given glibc's limitations ($HOSTALIASES only works on DNS-level aliases, and does not do lookups in /etc/hosts). Even under docker, this makes the tests depend on the DNS server, and whether it resolves localhost or not. In order to make the docker tests more hermetic and isolated from the environment, this patch introduces a docker entrypoint that, within the container, will launch minidns and override /etc/resolv.conf to use it. This guarantees that the tests will be able to resolve localhost, and also avoid accidental reliance on external DNS zones.
This directory holds end to end tests, written usually in a combination of shell and some Python. They're not expected to be portable, as that gets impractical very quickly. They also have some dependencies, listed below. ## Dependencies The tests depend on the following things being installed on the system (listed as Debian package, for consistency): - msmtp - util-linux (for /usr/bin/setsid) For t-02-exim (Exim interaction tests): - gettext-base (for /usr/bin/envsubst) - The exim binary available somewhere, but it doesn't have to be installed. There's a script "get-exim4-debian.sh" to get it from the archives. For some tests, python >= 3.5 is required; they will be skipped if it's not available.