diff --git a/crates/fidc-core/tests/engine_hooks.rs b/crates/fidc-core/tests/engine_hooks.rs
index 2faf10a..bbe249c 100644
--- a/crates/fidc-core/tests/engine_hooks.rs
+++ b/crates/fidc-core/tests/engine_hooks.rs
@@ -2143,15 +2143,15 @@ fn strategy_context_exposes_advanced_data_helpers() {
 fn engine_runs_minute_hooks_and_executes_minute_orders() {
     let date = d(2025, 1, 2);
     let data = DataSet::from_components_with_actions_and_quotes(
-        vec![Instrument {
-            symbol: "000001.SZ".to_string(),
+        ["000001.SZ", "000002.SZ"].into_iter().map(|symbol| Instrument {
+            symbol: symbol.to_string(),
             name: "Anchor".to_string(),
             board: "SZ".to_string(),
             round_lot: 100,
             listed_at: Some(d(2020, 1, 1)),
             delisted_at: None,
             status: "active".to_string(),
-        }],
+        }).collect(),
         vec![DailyMarketSnapshot {
             date,
             symbol: "000001.SZ".to_string(),
@@ -4162,7 +4162,7 @@ impl Strategy for BuyMissingRowThenHoldStrategy {
 }
 
 #[test]
-fn engine_carries_position_price_when_current_market_row_is_missing() {
+fn engine_rejects_an_unexplained_missing_holding_close() {
     let date1 = d(2025, 5, 26);
     let date2 = d(2025, 5, 27);
     let data = DataSet::from_components(
@@ -4230,20 +4230,16 @@ fn engine_carries_position_price_when_current_market_row_is_missing() {
         },
     );
 
-    let result = engine
+    let error = engine
         .run()
-        .expect("backtest should not fail on one missing holding row");
-    assert_eq!(result.equity_curve.len(), 2);
-    assert!(
-        result
-            .daily_holdings
-            .iter()
-            .any(|holding| holding.date == date2 && holding.symbol == "601028.SH")
-    );
+        .expect_err("unknown missing market data must not become a carried close");
+    let detail = format!("{error:?}");
+    assert!(detail.contains("MissingSnapshot") && detail.contains("close price"));
+    assert!(detail.contains("601028.SH") && detail.contains("2025-05-27"));
 }
 
 #[test]
-fn platform_strategy_skips_position_stop_take_when_current_market_row_is_missing() {
+fn platform_strategy_cannot_hide_missing_valuation_by_skipping_stop_take() {
     let date1 = d(2025, 5, 26);
     let date2 = d(2025, 5, 27);
     let data = DataSet::from_components(
@@ -4333,14 +4329,10 @@ fn platform_strategy_skips_position_stop_take_when_current_market_row_is_missing
         },
     );
 
-    let result = engine
+    let error = engine
         .run()
-        .expect("platform strategy should hold through a missing current market row");
-    assert_eq!(result.equity_curve.len(), 2);
-    assert!(
-        result
-            .daily_holdings
-            .iter()
-            .any(|holding| holding.date == date2 && holding.symbol == "601028.SH")
-    );
+        .expect_err("skipping a stop condition cannot fabricate the missing valuation");
+    let detail = format!("{error:?}");
+    assert!(detail.contains("MissingSnapshot") && detail.contains("close price"));
+    assert!(detail.contains("601028.SH") && detail.contains("2025-05-27"));
 }