diff --git a/requirements/test.txt b/requirements/test.txt
index 4b4fbc0b..da7f56e9 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -1,3 +1,4 @@
 # Requirements for test.
 coverage
+hypothesis
 pytest
diff --git a/test/backtesting/test_vbt_backtest_deep.py b/test/backtesting/test_vbt_backtest_deep.py
index 7c4bb562..661e6620 100644
--- a/test/backtesting/test_vbt_backtest_deep.py
+++ b/test/backtesting/test_vbt_backtest_deep.py
@@ -1,3 +1,4 @@
+
 """Deep property-based tests for the unified backtest engine.
 
 Extends test_vbt_backtest.py with hypothesis-based property tests,
@@ -10,8 +11,8 @@ import numpy as np
 import pandas as pd
 import pytest
 
-from hypothesis import assume, given, settings
 from hypothesis import strategies as st
+from hypothesis import assume, given, settings
 from hypothesis.extra.numpy import arrays
 
 from rdagent.components.backtesting.vbt_backtest import (
diff --git a/test/local/test_autopilot.py b/test/local/test_autopilot.py
index 338933b2..a53afbb1 100644
--- a/test/local/test_autopilot.py
+++ b/test/local/test_autopilot.py
@@ -5,6 +5,8 @@ the StrategyOrchestrator at the correct import path.
 """
 
 from __future__ import annotations
+from hypothesis import given, settings, HealthCheck
+from hypothesis import strategies as st
 
 import sys
 from pathlib import Path
diff --git a/test/local/test_continuous_strategies.py b/test/local/test_continuous_strategies.py
index 4a912fa6..04103b00 100644
--- a/test/local/test_continuous_strategies.py
+++ b/test/local/test_continuous_strategies.py
@@ -5,6 +5,8 @@ without requiring real StrategyOrchestrator connections.
 """
 
 from __future__ import annotations
+from hypothesis import given, settings, HealthCheck
+from hypothesis import strategies as st
 
 import sys
 from pathlib import Path
diff --git a/test/local/test_gen_strategies.py b/test/local/test_gen_strategies.py
index cb530677..5ac0c699 100644
--- a/test/local/test_gen_strategies.py
+++ b/test/local/test_gen_strategies.py
@@ -5,6 +5,8 @@ criteria, and the TeeFile logger — without requiring real OHLCV data or LLM.
 """
 
 from __future__ import annotations
+from hypothesis import given, settings, HealthCheck
+from hypothesis import strategies as st
 
 import json
 import os
diff --git a/test/local/test_nexquant_parallel.py b/test/local/test_nexquant_parallel.py
index a7c8aee3..f625b018 100644
--- a/test/local/test_nexquant_parallel.py
+++ b/test/local/test_nexquant_parallel.py
@@ -5,6 +5,8 @@ command building, and API key loading logic.
 """
 
 from __future__ import annotations
+from hypothesis import given, settings, HealthCheck
+from hypothesis import strategies as st
 
 import os
 import signal
diff --git a/test/qlib/test_verify_runtime_deep.py b/test/qlib/test_verify_runtime_deep.py
index 0a3dfb8a..610d45dc 100644
--- a/test/qlib/test_verify_runtime_deep.py
+++ b/test/qlib/test_verify_runtime_deep.py
@@ -1,3 +1,4 @@
+
 """Deep tests for verify_runtime — property-based, fuzzing, edge cases.
 
 Extends test_verify_runtime.py with property-based tests using hypothesis
@@ -15,8 +16,8 @@ import pytest
 PROJECT_ROOT = Path(__file__).parent.parent.parent
 sys.path.insert(0, str(PROJECT_ROOT))
 
-from hypothesis import assume, given, settings
 from hypothesis import strategies as st
+from hypothesis import given, settings
 from hypothesis.extra.numpy import arrays
 
 from rdagent.components.backtesting.verify import verify_and_log, verify_backtest_result