save_live_data_backtest - added docs and tests

tests/freqai/test_freqai_datakitchen.py

@@ -259,3 +259,47 @@ def test_get_full_model_path(mocker, freqai_conf, model):
 
     model_path = freqai.dk.get_full_models_path(freqai_conf)
     assert model_path.is_dir() is True
+
+
+def test_save_backtesting_live_dataframe(mocker, freqai_conf):
+    freqai, dataframe = make_unfiltered_dataframe(mocker, freqai_conf)
+    dataframe_without_last_candle = dataframe.copy()
+    dataframe_without_last_candle.drop(dataframe.tail(1).index, inplace=True)
+    freqai_conf.update({"save_live_data_backtest": True})
+    freqai.dk.save_backtesting_live_dataframe(dataframe_without_last_candle, "ADA/BTC")
+    saved_dataframe = freqai.dk.get_backtesting_live_dataframe()
+    assert len(saved_dataframe) == 1
+    assert saved_dataframe.iloc[-1, 0] == dataframe_without_last_candle.iloc[-1, 0]
+    freqai.dk.save_backtesting_live_dataframe(dataframe, "ADA/BTC")
+    saved_dataframe = freqai.dk.get_backtesting_live_dataframe()
+    assert len(saved_dataframe) == 2
+    assert saved_dataframe.iloc[-1, 0] == dataframe.iloc[-1, 0]
+    assert saved_dataframe.iloc[-2, 0] == dataframe.iloc[-2, 0]
+
+
+def test_get_timerange_from_backtesting_live_dataframe(mocker, freqai_conf):
+    freqai, dataframe = make_unfiltered_dataframe(mocker, freqai_conf)
+    freqai_conf.update({"save_live_data_backtest": True})
+    freqai.dk.set_backtesting_live_dataframe_path("ADA/BTC")
+    freqai.dk.save_backtesting_live_dataframe_to_feather(dataframe)
+    timerange = freqai.dk.get_timerange_from_backtesting_live_dataframe()
+    assert timerange.startts == 1516406400
+    assert timerange.stopts == 1517356500
+
+
+def test_get_timerange_from_backtesting_live_dataframe_folder_not_found(mocker, freqai_conf):
+    freqai, _ = make_unfiltered_dataframe(mocker, freqai_conf)
+    with pytest.raises(
+            OperationalException,
+            match=r'Saved live data not found.*'
+            ):
+        freqai.dk.get_timerange_from_backtesting_live_dataframe()
+
+
+def test_saved_live_bt_file_not_found(mocker, freqai_conf):
+    freqai, _ = make_unfiltered_dataframe(mocker, freqai_conf)
+    with pytest.raises(
+            OperationalException,
+            match=r'.*live backtesting dataframe file not found.*'
+            ):
+        freqai.dk.get_backtesting_live_dataframe()