diff --git a/tests/conftest.py b/tests/conftest.py
index 1ff3da08c..63dbc6941 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -510,7 +510,7 @@ def get_default_conf(testdatadir):
             "chat_id": "0",
             "notification_settings": {},
         },
-        "datadir": str(testdatadir),
+        "datadir": Path(testdatadir),
         "initial_state": "running",
         "db_url": "sqlite://",
         "user_data_dir": Path("user_data"),
diff --git a/tests/test_configuration.py b/tests/test_configuration.py
index cdf9f2f2e..a2a1b72cc 100644
--- a/tests/test_configuration.py
+++ b/tests/test_configuration.py
@@ -58,6 +58,7 @@ def test_load_config_incorrect_stake_amount(default_conf) -> None:
 
 def test_load_config_file(default_conf, mocker, caplog) -> None:
     del default_conf['user_data_dir']
+    default_conf['datadir'] = str(default_conf['datadir'])
     file_mock = mocker.patch('freqtrade.configuration.load_config.open', mocker.mock_open(
         read_data=json.dumps(default_conf)
     ))
@@ -69,6 +70,7 @@ def test_load_config_file(default_conf, mocker, caplog) -> None:
 
 def test_load_config_file_error(default_conf, mocker, caplog) -> None:
     del default_conf['user_data_dir']
+    default_conf['datadir'] = str(default_conf['datadir'])
     filedata = json.dumps(default_conf).replace(
         '"stake_amount": 0.001,', '"stake_amount": .001,')
     mocker.patch('freqtrade.configuration.load_config.open', mocker.mock_open(read_data=filedata))
@@ -80,6 +82,7 @@ def test_load_config_file_error(default_conf, mocker, caplog) -> None:
 
 def test_load_config_file_error_range(default_conf, mocker, caplog) -> None:
     del default_conf['user_data_dir']
+    default_conf['datadir'] = str(default_conf['datadir'])
     filedata = json.dumps(default_conf).replace(
         '"stake_amount": 0.001,', '"stake_amount": .001,')
     mocker.patch.object(Path, "read_text", MagicMock(return_value=filedata))
@@ -238,6 +241,7 @@ def test_print_config(default_conf, mocker, caplog) -> None:
     conf1 = deepcopy(default_conf)
     # Delete non-json elements from default_conf
     del conf1['user_data_dir']
+    conf1['datadir'] = str(conf1['datadir'])
     config_files = [conf1]
 
     configsmock = MagicMock(side_effect=config_files)
diff --git a/tests/test_plotting.py b/tests/test_plotting.py
index 7662ea7f1..e05796801 100644
--- a/tests/test_plotting.py
+++ b/tests/test_plotting.py
@@ -45,7 +45,6 @@ def test_init_plotscript(default_conf, mocker, testdatadir):
     default_conf['timerange'] = "20180110-20180112"
     default_conf['trade_source'] = "file"
     default_conf['timeframe'] = "5m"
-    default_conf["datadir"] = testdatadir
     default_conf['exportfilename'] = testdatadir / "backtest-result.json"
     supported_markets = ["TRX/BTC", "ADA/BTC"]
     ret = init_plotscript(default_conf, supported_markets)
@@ -394,7 +393,6 @@ def test_load_and_plot_trades(default_conf, mocker, caplog, testdatadir):
     patch_exchange(mocker)
 
     default_conf['trade_source'] = 'file'
-    default_conf["datadir"] = testdatadir
     default_conf['exportfilename'] = testdatadir / "backtest-result.json"
     default_conf['indicators1'] = ["sma5", "ema10"]
     default_conf['indicators2'] = ["macd"]