Final retouching and integration of contributed fractal study and tes…

…t case

backtrader/studies/contrib/__init__.py

@@ -24,5 +24,5 @@
 import backtrader as bt
 
 from .import fractal as fractal
-for name in vortex.__all__:
+for name in fractal.__all__:
     setattr(bt.studies, name, getattr(fractal, name))

backtrader/studies/contrib/fractal.py

@@ -24,7 +24,10 @@
 import backtrader as bt
 
 
-class Fractal(bt.PeriodN):
+__all__ = ['Fractal']
+
+
+class Fractal(bt.ind.PeriodN):
     '''
     References:
         [Ref 1] http://www.investopedia.com/articles/trading/06/fractals.asp

tests/test_study_fractal.py

@@ -0,0 +1,51 @@
+#!/usr/bin/env python
+# -*- coding: utf-8; py-indent-offset:4 -*-
+###############################################################################
+#
+# Copyright (C) 2015, 2016 Daniel Rodriguez
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+###############################################################################
+from __future__ import (absolute_import, division, print_function,
+                        unicode_literals)
+
+import testcommon
+
+import backtrader as bt
+
+
+chkdatas = 1
+chkvals = [
+    ['nan', 'nan', 'nan'],
+    ['nan', 'nan', '3553.692850']
+]
+
+chkmin = 5
+chkind = bt.studies.Fractal
+
+
+def test_run(main=False):
+    datas = [testcommon.getdata(i) for i in range(chkdatas)]
+    testcommon.runtest(datas,
+                       testcommon.TestStrategy,
+                       main=main,
+                       plot=main,
+                       chkind=chkind,
+                       chkmin=chkmin,
+                       chkvals=chkvals)
+
+
+if __name__ == '__main__':
+    test_run(main=True)