tests: prevent parallel env var access

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Closed th1000s closed 1 month ago

th1000s commented 2 months ago

env::set_var is not-yet-unsafe, and here tests fail because a var is already set by a second test while the first one is still running.

cargo test -- test_env with sufficient (auto detected) parallelism triggers this.

dandavison commented 1 month ago

Thanks!