Revision control
++ This test is designed to verify the network capabilities of COIN VMs.
++
++ It attempts to resolve host addresses, as done in tst_QDnsLoopup::lookup().
++ In order to deliver a reliable result, it has to be built against a released
++ version of Qt, that has no known issues in the Network module of qtbase.
++
++ This version can be a minimal one. Only libQt6Core.so and libQt6Network.so
++ are needed. Those libraries have to be deployed or statically linked for
++ platforms that don't have a Qt installation by default (e.g. RHEL).
++
++ Example configure line:
++ configure --release --static --no-prefix --no-feature-gui --no-feature-icu
++
++ The executable has to be run before ctest.
++ If no arguments are passed, it will
++ - return 0, if the VM has network and otherwise 1
++ - write a summary about start/end of the test and the number of errors occurred
++
++ For diagnostic purposes, the following command line options are available:
++ -v, --version Displays version information.
++ -h, --help Displays help on commandline options.
++ --help-all Displays help, including generic Qt options.
++ --input-file, -i <jsonFile> JSON input file to parse
++ --timeout, --to, -t <timeout> Overall timeout in milliseconds
++ --dns-timeout, --dt <dnsTimeout> Timeout for a single DNS lookup in
++ milliseconds (default: 2000)
++ --max-losses, --ml <maxLosses> Number of tolerated UDP packet losses (DNS
++ lookup timeouts) per record before it counts
++ as an error (default: 0)
++ --warn-only, --wo Just warn, exit 0 on error.
++ --verbosity, -d <verbosity> 0=silent, 1=summary, 2=all errors, 3=all
++ errors and successes
++ --copy-default-file, -o <file> Write a copy of the default file to the given
++ path
++ --show-progress, -p Show progress
++
++ Instead of passing command line arguments directly, they can be provided via
++ the CI_NETWORK_TESTARGS environment variable, which is expected to contain a
++ string of command line arguments in the usual shell-quoted form. If set and
++ non-empty, its content overrides all command line arguments passed to the
++ executable, and the override is logged.
++
++ Whenever a lookup fails, whether because of a server error, an unexpected
++ result, or exceeding --max-losses, the shell command needed to reproduce it
++ manually is logged ("dig <type> <fqdn>" on Linux/macOS, "nslookup -type=<type>
++ <fqdn>" on Windows).