Move tests out of freqtrade module

tests/test_indicator_helpers.py

@@ -0,0 +1,15 @@
+# pragma pylint: disable=missing-docstring
+
+import pandas as pd
+
+from freqtrade.indicator_helpers import went_down, went_up
+
+
+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]))