Fix collect_steps

ipa-core/benches/oneshot/ipa.rs

@@ -108,7 +108,7 @@ async fn run(args: Args) -> Result<(), Error> {
 
     let seed = args.random_seed.unwrap_or_else(|| random());
     tracing::info!(
-        "Using random seed: {seed} for {q} records",
+        "Using random seed {seed} for {q} records",
         q = args.query_size
     );
     let rng = StdRng::seed_from_u64(seed);

ipa-core/src/test_fixture/world.rs

@@ -232,7 +232,9 @@ impl<S: ShardingScheme> TestWorld<S> {
     #[must_use]
     pub fn with_config(config: &TestWorldConfig) -> Self {
         logging::setup();
-        println!("Using seed {seed}", seed = config.seed);
+        // Print to stdout so that it appears in test runs only on failure.
+        // scripts/collect_steps.py must be updated if the message text changes.
+        println!("TestWorld random seed {seed}", seed = config.seed);
 
         let shard_count = ShardIndex::try_from(S::SHARDS).unwrap();
         let shard_network = InMemoryShardNetwork::with_shards(shard_count);

scripts/collect_steps.py

@@ -70,6 +70,9 @@ def collect_steps(args):
         if not line or line == "":
             break
 
+        if line.startswith("TestWorld random seed "):
+            continue
+
         if not line.startswith(ROOT_STEP_PREFIX):
             print("Unexpected line: " + line, flush=True)
             exit(1)