I regularly run my tests also as root, since some of the tested code uses privileged APIs. The test-resolved-stream so far tried to run its tests in a user/network namespace if that can be allocated. This caused the tests to fail on my system where once the user namespace is opened access to the build tree in my $HOME is prohibited (due to restricted access modes on my home dir). Let's add a check for that: before actually isolating the test in a user/network namespace, let's see if that would make it impossible for us to access the build tree (which we need to do load the TLS certificates the test requires). This should make the test pass when run as root from a build tree with restrictive access mode.
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