`lightning-dns-resolver` tests are broken under `cfg(async_payments)`

[tnull]

When running RUSTFLAGS="--cfg async_payments" cargo test on the workspace, it seems both test cases currently implemented in lightning-dns-resolver are broken:

failures:
    test::end_to_end_test
    test::resolution_test

test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.20s

Here are the backtraces:

resolver: Buffered onion message when sending DNSResolverMessage
node 0 TRACE [lightning::onion_message::messenger:1175] Errored decoding onion message packet: Relay { err_msg: "Unable to decode our hop data", reason: InvalidOnionPayload, shared_secret: SharedSecret(#bcac45117cb7fe12), trampoline_shared_secret: None }
node 0 ERROR [lightning::onion_message::messenger:2078] Failed to process onion message ()

thread 'test::end_to_end_test' panicked at lightning-dns-resolver/src/lib.rs:406:85:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0: rust_begin_unwind
             at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:695:5
   1: core::panicking::panic_fmt
             at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/panicking.rs:75:14
   2: core::panicking::panic
             at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/panicking.rs:145:5
   3: core::option::unwrap_failed
             at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/option.rs:2015:5
   4: core::option::Option<T>::unwrap
             at /home/tnull/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:978:21
   5: lightning_dns_resolver::test::pay_offer_flow::{{closure}}
             at ./src/lib.rs:406:16
   6: lightning_dns_resolver::test::end_to_end_test::{{closure}}
             at ./src/lib.rs:504:4
   7: tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::{{closure}}::{{closure}}
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:733:54
   8: tokio::task::coop::with_budget
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/task/coop/mod.rs:167:5
   9: tokio::task::coop::budget
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/task/coop/mod.rs:133:5
  10: tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::{{closure}}
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:733:25
  11: tokio::runtime::scheduler::current_thread::Context::enter
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:432:19
  12: tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:732:36
  13: tokio::runtime::scheduler::current_thread::CoreGuard::enter::{{closure}}
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:820:68
  14: tokio::runtime::context::scoped::Scoped<T>::set
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/context/scoped.rs:40:9
  15: tokio::runtime::context::set_scheduler::{{closure}}
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/context.rs:176:26
  16: std::thread::local::LocalKey<T>::try_with
             at /home/tnull/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:310:12
  17: std::thread::local::LocalKey<T>::with
             at /home/tnull/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:274:15
  18: tokio::runtime::context::set_scheduler
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/context.rs:176:9
  19: tokio::runtime::scheduler::current_thread::CoreGuard::enter
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:820:27
  20: tokio::runtime::scheduler::current_thread::CoreGuard::block_on
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:720:19
  21: tokio::runtime::scheduler::current_thread::CurrentThread::block_on::{{closure}}
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:200:28
  22: tokio::runtime::context::runtime::enter_runtime
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/context/runtime.rs:65:16
  23: tokio::runtime::scheduler::current_thread::CurrentThread::block_on
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:188:9
  24: tokio::runtime::runtime::Runtime::block_on_inner
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/runtime.rs:356:47
  25: tokio::runtime::runtime::Runtime::block_on
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/runtime.rs:330:13
  26: lightning_dns_resolver::test::end_to_end_test
             at ./src/lib.rs:507:3
  27: lightning_dns_resolver::test::end_to_end_test::{{closure}}
             at ./src/lib.rs:455:28
  28: core::ops::function::FnOnce::call_once
             at /home/tnull/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5
  29: core::ops::function::FnOnce::call_once
             at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.


failures:
    test::end_to_end_test

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 1 filtered out; finished in 0.20s

resolver: Buffered onion message when sending DNSResolverMessage
payer: Errored decoding onion message packet: Relay { err_msg: "Unable to decode our hop data", reason: InvalidOnionPayload, shared_secret: SharedSecret(#d3515317e1b5887e), trampoline_shared_secret: None }
payer: Failed to process onion message ()

thread 'test::resolution_test' panicked at lightning-dns-resolver/src/lib.rs:363:68:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0: rust_begin_unwind
             at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/std/src/panicking.rs:695:5
   1: core::panicking::panic_fmt
             at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/panicking.rs:75:14
   2: core::panicking::panic
             at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/panicking.rs:145:5
   3: core::option::unwrap_failed
             at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/option.rs:2015:5
   4: core::option::Option<T>::unwrap
             at /home/tnull/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/option.rs:978:21
   5: lightning_dns_resolver::test::resolution_test::{{closure}}
             at ./src/lib.rs:363:20
   6: tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::{{closure}}::{{closure}}
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:733:54
   7: tokio::task::coop::with_budget
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/task/coop/mod.rs:167:5
   8: tokio::task::coop::budget
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/task/coop/mod.rs:133:5
   9: tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}::{{closure}}
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:733:25
  10: tokio::runtime::scheduler::current_thread::Context::enter
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:432:19
  11: tokio::runtime::scheduler::current_thread::CoreGuard::block_on::{{closure}}
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:732:36
  12: tokio::runtime::scheduler::current_thread::CoreGuard::enter::{{closure}}
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:820:68
  13: tokio::runtime::context::scoped::Scoped<T>::set
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/context/scoped.rs:40:9
  14: tokio::runtime::context::set_scheduler::{{closure}}
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/context.rs:176:26
  15: std::thread::local::LocalKey<T>::try_with
             at /home/tnull/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:310:12
  16: std::thread::local::LocalKey<T>::with
             at /home/tnull/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/thread/local.rs:274:15
  17: tokio::runtime::context::set_scheduler
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/context.rs:176:9
  18: tokio::runtime::scheduler::current_thread::CoreGuard::enter
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:820:27
  19: tokio::runtime::scheduler::current_thread::CoreGuard::block_on
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:720:19
  20: tokio::runtime::scheduler::current_thread::CurrentThread::block_on::{{closure}}
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:200:28
  21: tokio::runtime::context::runtime::enter_runtime
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/context/runtime.rs:65:16
  22: tokio::runtime::scheduler::current_thread::CurrentThread::block_on
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/scheduler/current_thread/mod.rs:188:9
  23: tokio::runtime::runtime::Runtime::block_on_inner
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/runtime.rs:356:47
  24: tokio::runtime::runtime::Runtime::block_on
             at /home/tnull/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/tokio-1.45.1/src/runtime/runtime.rs:330:13
  25: lightning_dns_resolver::test::resolution_test
             at ./src/lib.rs:366:3
  26: lightning_dns_resolver::test::resolution_test::{{closure}}
             at ./src/lib.rs:301:28
  27: core::ops::function::FnOnce::call_once
             at /home/tnull/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5
  28: core::ops::function::FnOnce::call_once
             at /rustc/05f9846f893b09a1be1fc8560e33fc3c815cfecb/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.


failures:
    test::resolution_test

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 1 filtered out; finished in 0.21s

[tnull]

FWIW, it might be worth to extend the async_payments CI check to cover the entire workspace, not only lightning.