Add generic ohlcv_to_dataframe_multi test to ensure code works for diff. timeframe ranges

tests/data/test_converter.py

@@ -132,6 +132,16 @@ def test_ohlcv_fill_up_missing_data2(caplog):
                       f"{len(data)} - after: {len(data2)}.*", caplog)
 
 
+@pytest.mark.parametrize('timeframe', ['1m', '5m', '15m', '1h', '1d', '1M'])
+def test_ohlcv_to_dataframe_multi(timeframe):
+    data = generate_test_data(timeframe, 40)
+    assert len(data) == 40
+    df = ohlcv_to_dataframe(data, timeframe, 'UNITTEST/USDT')
+    assert len(df) == len(data) - 1
+    df = ohlcv_to_dataframe(data, timeframe, 'UNITTEST/USDT', drop_incomplete=False)
+    assert len(df) == len(data)
+
+
 def test_ohlcv_to_dataframe_1M():
 
     # Monthly ticks from 2019-09-01 to 2023-07-01