123 lines
4.9 KiB
Rust
123 lines
4.9 KiB
Rust
//! SIM_SPEC §7.6 cross-architecture parity test.
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//!
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//! Runs the reference scenario through the full pipeline (scenario
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//! loader → engine → network → bundle writer) using the deterministic
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//! `parity_stub` host kind, then compares the SHA-256 of the bundle's
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//! `events.ndjson` against the constant `EXPECTED_EVENTS_NDJSON_SHA256`
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//! below.
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//!
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//! A mismatch is either:
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//! - a deliberate spec amendment (in which case the commit that
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//! changes the simulator's emission updates this constant and
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//! explains why), or
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//! - a determinism bug. The §7 contract says the bundle is
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//! byte-identical across runs *and* architectures for the same
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//! `seed`; this test gates against both.
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//!
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//! The test also runs the scenario twice in-process and asserts the
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//! two digests match — that catches per-run drift even before the
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//! constant gets updated.
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use std::fs;
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use std::path::{Path, PathBuf};
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use sha2::{Digest, Sha256};
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use tempfile::TempDir;
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use simulation::bundle_file::FileBundleWriter;
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use simulation::engine::Engine;
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use simulation::network::Network;
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use simulation::parity_host::{ParityStubHost, ParityStubKindValidator};
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use simulation::scenario::{HostKindRegistry, Scenario, load_from_path};
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/// SHA-256 of `events.ndjson` for the reference scenario at
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/// `scenarios/parity/reference.toml`. Checked in; updated only as
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/// part of a deliberate spec amendment.
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// Updated in iteration 10 when DialOutcome's `at_ns` was corrected
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// from the pre-penalty arrival to the post-penalty arrival (the
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// judge's finding 1 against §5.4 step 8). Bundle events now record
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// the message arrival time on the cold-dial path instead of the
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// pre-penalty timestamp, so the digest of `events.ndjson` shifts
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// for any scenario whose cold-dial penalty is non-zero.
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const EXPECTED_EVENTS_NDJSON_SHA256: &str =
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"a76b557d3da7a5d0f393446231669b8f7b1945a251805bed33fa09fb27ab3db0";
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fn registry() -> HostKindRegistry {
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let mut r = HostKindRegistry::with_swim();
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r.register(Box::new(ParityStubKindValidator));
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r
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}
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fn load_reference() -> Scenario {
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let path = Path::new(env!("CARGO_MANIFEST_DIR")).join("scenarios/parity/reference.toml");
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load_from_path(&path, ®istry()).expect("reference scenario must validate")
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}
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fn run_and_hash(scenario: &Scenario, out_dir: PathBuf) -> String {
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let writer = FileBundleWriter::new(&out_dir, scenario.clone());
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let network = Network::new(scenario);
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let mut engine = Engine::new(scenario, network, writer);
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let peer_ids: Vec<String> = scenario.peers.iter().map(|p| p.id.clone()).collect();
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for peer in &scenario.peers {
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engine.install_host(Box::new(ParityStubHost::new(
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peer.id.clone(),
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peer_ids.clone(),
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)));
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}
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engine.set_pop_budget(10_000);
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let _ = engine.run();
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let writer = engine.into_writer();
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writer.finalize().expect("finalize bundle");
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hex_sha256_of(&fs::read(out_dir.join("events.ndjson")).unwrap())
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}
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fn hex_sha256_of(bytes: &[u8]) -> String {
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let mut h = Sha256::new();
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h.update(bytes);
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h.finalize().iter().map(|b| format!("{b:02x}")).collect()
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}
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// ──────────────────────────────────────────────────────────────────────
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// §7.6 cross-architecture parity
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// ──────────────────────────────────────────────────────────────────────
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#[test]
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fn reference_scenario_events_ndjson_matches_checked_in_digest() {
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let scen = load_reference();
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let tmp = TempDir::new().unwrap();
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let digest = run_and_hash(&scen, tmp.path().join("bundle"));
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assert_eq!(
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digest, EXPECTED_EVENTS_NDJSON_SHA256,
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"\
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events.ndjson digest changed.
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If this was a deliberate spec amendment, update the constant
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EXPECTED_EVENTS_NDJSON_SHA256 in this file to:
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{digest}
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…and explain why in the commit message.
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Otherwise this is a determinism regression: the same scenario+seed
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produced different bytes than the checked-in reference."
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);
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}
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#[test]
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fn reference_scenario_is_deterministic_across_runs() {
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let scen = load_reference();
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let tmp = TempDir::new().unwrap();
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let d1 = run_and_hash(&scen, tmp.path().join("bundle_a"));
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let d2 = run_and_hash(&scen, tmp.path().join("bundle_b"));
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assert_eq!(d1, d2, "two runs of the same scenario must produce the same digest");
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}
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#[test]
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fn reference_scenario_changing_seed_changes_the_digest() {
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// Negative: tweak the seed and verify the digest is *not* equal to
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// the reference. Confirms the digest is sensitive to scenario input
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// (i.e. not a constant byte sequence by accident).
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let mut scen = load_reference();
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scen.seed ^= 0x1234_5678;
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let tmp = TempDir::new().unwrap();
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let d = run_and_hash(&scen, tmp.path().join("bundle"));
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assert_ne!(d, EXPECTED_EVENTS_NDJSON_SHA256);
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}
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