Since these tests create, use, and destroy the Docker integration_net network,
they must run one at a time, rather than in parallel. Cargo wants to run them
in parallel, and must be specifically ordered not to do so.
ci/all.sh is designed to give Cargo the proper serialization orders, but
IntelliJ is not. If you run these tests from IntelliJ, make sure to run only
one at a time. If you want to run several, use ci/all.sh or a specific
cargo command that works like ci/all.sh does.
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