diff --git a/freqtrade/tests/test_persistence.py b/freqtrade/tests/test_persistence.py
index dae9f3c90..d8d42461b 100644
--- a/freqtrade/tests/test_persistence.py
+++ b/freqtrade/tests/test_persistence.py
@@ -1,9 +1,11 @@
 # pragma pylint: disable=missing-docstring, C0103
 from copy import deepcopy
+from unittest.mock import MagicMock
 
 import pytest
 from sqlalchemy import create_engine
 
+from freqtrade import constants
 from freqtrade.persistence import Trade, init, clean_dry_run_db
 
 
@@ -25,18 +27,39 @@ def test_init_custom_db_url(default_conf, mocker):
     conf = deepcopy(default_conf)
 
     # Update path to a value other than default, but still in-memory
-    conf.update({'db_url': 'sqlite:///'})
+    conf.update({'db_url': 'sqlite:////tmp/freqtrade2_test.sqlite'})
+    create_engine_mock = mocker.patch('freqtrade.persistence.create_engine', MagicMock())
     mocker.patch.dict('freqtrade.persistence._CONF', conf)
 
-    # Check if the new tradesv3.dry_run.sqlite was created
     init(conf)
+    assert create_engine_mock.call_count == 1
+    assert create_engine_mock.mock_calls[0][1][0] == 'sqlite:////tmp/freqtrade2_test.sqlite'
 
 
 def test_init_prod_db(default_conf, mocker):
-    default_conf.update({'dry_run': False})
-    mocker.patch.dict('freqtrade.persistence._CONF', default_conf)
+    conf = deepcopy(default_conf)
+    conf.update({'dry_run': False})
+    conf.update({'db_url': constants.DEFAULT_DB_PROD_URL})
 
-    init(default_conf)
+    create_engine_mock = mocker.patch('freqtrade.persistence.create_engine', MagicMock())
+    mocker.patch.dict('freqtrade.persistence._CONF', conf)
+
+    init(conf)
+    assert create_engine_mock.call_count == 1
+    assert create_engine_mock.mock_calls[0][1][0] == 'sqlite:///tradesv3.sqlite'
+
+
+def test_init_dryrun_db(default_conf, mocker):
+    conf = deepcopy(default_conf)
+    conf.update({'dry_run': True})
+    conf.update({'db_url': constants.DEFAULT_DB_DRYRUN_URL})
+
+    create_engine_mock = mocker.patch('freqtrade.persistence.create_engine', MagicMock())
+    mocker.patch.dict('freqtrade.persistence._CONF', conf)
+
+    init(conf)
+    assert create_engine_mock.call_count == 1
+    assert create_engine_mock.mock_calls[0][1][0] == 'sqlite://'
 
 
 @pytest.mark.usefixtures("init_persistence")