[Pkg-rust-maintainers] Bug#1150108: rust-service-binding: test service::tests::parse_tcp_localhost fails on IPv4-only machines

[Nadzeya Hutsko]

Source: rust-service-binding
Version: 3.0.0-2
Severity: normal

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Dear Maintainer,

The `service::tests::parse_tcp_localhost` test assumes that "localhost" resolves to both `127.0.0.1` and `::1`

On the machines where localhost only resolves to 127.0.0.1, the test fails:
```
  ---- service::tests::parse_tcp_localhost stdout ----
  thread 'service::tests::parse_tcp_localhost' panicked at src/service.rs:475:9:
  assertion `left == right` failed
    left: [127.0.0.1:8081]
   right: [127.0.0.1:8081, [::1]:8081]
  test result: FAILED. 20 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out
```

I'd suggest updating the test so it doesn't depend on the host's IPv6 localhost setup. For example, only require that `127.0.0.1:8081` is in the result, or build the expected list from `"localhost:8081".to_socket_addrs()`. Any IPv4-only test environment will hit this error.

The bug has been forwarded upstream: https://github.com/wiktor-k/service-binding/issues/44

Nadzeya

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