Seperate plot-name generation and plotting

freqtrade/plot/plotting.py

@@ -204,7 +204,16 @@ def generate_candlestick_graph(
     return fig
 
 
-def generate_plot_file(fig, pair, ticker_interval) -> None:
+def generate_plot_filename(pair, ticker_interval) -> str:
+    pair_name = pair.replace("/", "_")
+    file_name = 'freqtrade-plot-' + pair_name + '-' + ticker_interval + '.html'
+
+    logger.info('Generate plot file for %s', pair)
+
+    return file_name
+
+
+def generate_plot_file(fig, filename: str, auto_open: bool = False) -> None:
     """
     Generate a plot html file from pre populated fig plotly object
     :param fig: Plotly Figure to plot
@@ -212,12 +221,8 @@ def generate_plot_file(fig, pair, ticker_interval) -> None:
     :param ticker_interval: Used as part of the filename
     :return: None
     """
-    logger.info('Generate plot file for %s', pair)
-
-    pair_name = pair.replace("/", "_")
-    file_name = 'freqtrade-plot-' + pair_name + '-' + ticker_interval + '.html'
 
     Path("user_data/plots").mkdir(parents=True, exist_ok=True)
 
-    plot(fig, filename=str(Path('user_data/plots').joinpath(file_name)),
-         auto_open=False)
+    plot(fig, filename=str(Path('user_data/plots').joinpath(filename)),
+         auto_open=auto_open)

freqtrade/tests/test_plotting.py

@@ -1,15 +1,17 @@
 
+from copy import deepcopy
 from unittest.mock import MagicMock
 
-from plotly import tools
 import plotly.graph_objs as go
-from copy import deepcopy
+from plotly import tools
 
 from freqtrade.arguments import TimeRange
 from freqtrade.data import history
 from freqtrade.data.btanalysis import load_backtest_data
-from freqtrade.plot.plotting import (generate_candlestick_graph, generate_plot_file,
-                                     generate_row, plot_trades)
+from freqtrade.plot.plotting import (generate_candlestick_graph,
+                                     generate_plot_file,
+                                     generate_plot_filename, generate_row,
+                                     plot_trades)
 from freqtrade.strategy.default_strategy import DefaultStrategy
 from freqtrade.tests.conftest import log_has, log_has_re
 
@@ -178,10 +180,15 @@ def test_generate_candlestick_graph_no_trades(default_conf, mocker):
     assert trades_mock.call_count == 1
 
 
+def test_generate_Plot_filename():
+    fn = generate_plot_filename("UNITTEST/BTC", "5m")
+    assert fn == "freqtrade-plot-UNITTEST_BTC-5m.html"
+
+
 def test_generate_plot_file(mocker, caplog):
     fig = generage_empty_figure()
     plot_mock = mocker.patch("freqtrade.plot.plotting.plot", MagicMock())
-    generate_plot_file(fig, "UNITTEST/BTC", "5m")
+    generate_plot_file(fig, filename="freqtrade-plot-UNITTEST_BTC-5m.html")
 
     assert plot_mock.call_count == 1
     assert plot_mock.call_args[0][0] == fig