add went_up and went_down helpers

freqtrade/indicator_helpers.py

@@ -0,0 +1,9 @@
+from pandas import Series
+
+
+def went_up(series: Series) -> Series:
+    return series > series.shift(1)
+
+
+def went_down(series: Series) -> Series:
+    return series < series.shift(1)

freqtrade/tests/test_indicator_helpers.py

@@ -0,0 +1,12 @@
+import pandas as pd
+from freqtrade.indicator_helpers import went_up, went_down
+
+
+def test_went_up():
+    series = pd.Series([1, 2, 3, 1])
+    assert went_up(series).equals(pd.Series([False, True, True, False]))
+
+
+def test_went_down():
+    series = pd.Series([1, 2, 3, 1])
+    assert went_down(series).equals(pd.Series([False, False, False, True]))