diff --git a/tests/conftest.py b/tests/conftest.py
index e175f2034..8ef40408d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -110,7 +110,9 @@ def generate_test_data(timeframe: str, size: int, start: str = '2020-07-05'):
     np.random.seed(42)
 
     base = np.random.normal(20, 2, size=size)
-    if timeframe == '1M':
+    if timeframe == '1y':
+        date = pd.date_range(start, periods=size, freq='1YS', tz='UTC')
+    elif timeframe == '1M':
         date = pd.date_range(start, periods=size, freq='1MS', tz='UTC')
     elif timeframe == '3M':
         date = pd.date_range(start, periods=size, freq='3MS', tz='UTC')
diff --git a/tests/data/test_converter.py b/tests/data/test_converter.py
index 245a882b6..c8a961951 100644
--- a/tests/data/test_converter.py
+++ b/tests/data/test_converter.py
@@ -157,6 +157,7 @@ def test_ohlcv_to_dataframe_multi(timeframe):
     assert len(df) == len(data) - 1
     df1 = ohlcv_to_dataframe(data, timeframe, 'UNITTEST/USDT', drop_incomplete=False)
     assert len(df1) == len(data)
+    assert data.equals(df1)
 
     data1 = data.copy()
     data1.loc[:, 'date'] = data1.loc[:, 'date'] + pd.to_timedelta('30s')