diff --git a/crates/ml-alpha/tests/multi_horizon_loader.rs b/crates/ml-alpha/tests/multi_horizon_loader.rs
index f1fc559fd..20948cfb8 100644
--- a/crates/ml-alpha/tests/multi_horizon_loader.rs
+++ b/crates/ml-alpha/tests/multi_horizon_loader.rs
@@ -21,7 +21,7 @@ fn cfg_from_env() -> Option<MultiHorizonLoaderConfig> {
     Some(MultiHorizonLoaderConfig {
         files,
         predecoded_dir: predec,
-        seq_len: 64,
+        multi_resolution: ml_alpha::data::aggregation::MultiResolutionConfig::default_three_scale(),
         horizons: HORIZONS,
         n_max_sequences: 100,
         seed: 0xA1A2_A3A4,
@@ -43,9 +43,9 @@ fn loader_yields_seq_with_valid_labels() {
 
     let mut count = 0;
     while let Some(seq) = loader.next_sequence().expect("next") {
-        assert_eq!(seq.snapshots.len(), cfg.seq_len);
+        assert_eq!(seq.snapshots.len(), cfg.multi_resolution.total_positions());
         for h in 0..N_HORIZONS {
-            assert_eq!(seq.labels[h].len(), cfg.seq_len);
+            assert_eq!(seq.labels[h].len(), cfg.multi_resolution.total_positions());
             for &v in &seq.labels[h] {
                 assert!(v.is_nan() || v == 0.0 || v == 1.0, "label not binary: {v}");
             }
@@ -65,7 +65,7 @@ fn loader_errors_on_empty_files() {
     let cfg = MultiHorizonLoaderConfig {
         files: Vec::new(),
         predecoded_dir: PathBuf::from("/tmp/does_not_exist_foxhunt_test"),
-        seq_len: 64,
+        multi_resolution: ml_alpha::data::aggregation::MultiResolutionConfig::default_three_scale(),
         horizons: HORIZONS,
         n_max_sequences: 10,
         seed: 0,
@@ -86,12 +86,12 @@ fn loader_stride_4_yields_correct_spacing() {
         eprintln!("skipping: FOXHUNT_TEST_DATA not set or mbp10 dir missing");
         return;
     };
-    cfg.seq_len = 32;
+    // cfg.multi_resolution stays at default_three_scale() (total_positions=32).
     cfg.n_max_sequences = 5;
     let mut loader = MultiHorizonLoader::new(&cfg).expect("loader init");
 
     while let Some(seq) = loader.next_sequence().expect("next") {
-        assert_eq!(seq.snapshots.len(), cfg.seq_len);
+        assert_eq!(seq.snapshots.len(), cfg.multi_resolution.total_positions());
         let dts_ns: Vec<i64> = (1..seq.snapshots.len())
             .map(|k| (seq.snapshots[k].ts_ns as i64) - (seq.snapshots[k - 1].ts_ns as i64))
             .filter(|d| *d >= 0) // ts_ns is monotonic in MBP-10