diff --git a/tests/optimize/test_hyperopt.py b/tests/optimize/test_hyperopt.py
index f0a2342c5..14fea573f 100644
--- a/tests/optimize/test_hyperopt.py
+++ b/tests/optimize/test_hyperopt.py
@@ -307,6 +307,18 @@ def test_roi_table_generation(hyperopt) -> None:
     assert hyperopt.custom_hyperopt.generate_roi_table(params) == {0: 6, 15: 3, 25: 1, 30: 0}
 
 
+def test_params_no_optimize_details(hyperopt) -> None:
+    hyperopt.config['spaces'] = ['buy']
+    res = hyperopt._get_no_optimize_details()
+    assert isinstance(res, dict)
+    assert "trailing" in res
+    assert res["trailing"]['trailing_stop'] is False
+    assert "roi" in res
+    assert res['roi']['0'] == 0.04
+    assert "stoploss" in res
+    assert res['stoploss']['stoploss'] == -0.1
+
+
 def test_start_calls_optimizer(mocker, hyperopt_conf, capsys) -> None:
     dumper = mocker.patch('freqtrade.optimize.hyperopt.dump')
     dumper2 = mocker.patch('freqtrade.optimize.hyperopt.Hyperopt._save_result')
diff --git a/tests/optimize/test_hyperopttools.py b/tests/optimize/test_hyperopt_tools.py
similarity index 97%
rename from tests/optimize/test_hyperopttools.py
rename to tests/optimize/test_hyperopt_tools.py
index 6beb2788a..72125f1a2 100644
--- a/tests/optimize/test_hyperopttools.py
+++ b/tests/optimize/test_hyperopt_tools.py
@@ -2,13 +2,14 @@ import logging
 import re
 from pathlib import Path
 from typing import Dict, List
+import numpy as np
 
 import pytest
 import rapidjson
 
 from freqtrade.constants import FTHYPT_FILEVERSION
 from freqtrade.exceptions import OperationalException
-from freqtrade.optimize.hyperopt_tools import HyperoptTools
+from freqtrade.optimize.hyperopt_tools import HyperoptTools, hyperopt_serializer
 from tests.conftest import log_has, log_has_re
 
 
@@ -307,3 +308,10 @@ def test_params_print(capsys):
     assert re.search('trailing_stop_positive = 0.05  # value loaded.*\n', captured.out)
     assert re.search('trailing_stop_positive_offset = 0.1  # value loaded.*\n', captured.out)
     assert re.search('trailing_only_offset_is_reached = True  # value loaded.*\n', captured.out)
+
+
+def test_hyperopt_serializer():
+
+    assert isinstance(hyperopt_serializer(np.int_(5)), int)
+    assert isinstance(hyperopt_serializer(np.bool_(True)), bool)
+    assert isinstance(hyperopt_serializer(np.bool_(False)), bool)