Make tests package

et_xmlfile/tests/helper.py

+from __future__ import absolute_import
+# Copyright (c) 2010-2015 openpyxl
+
+# Python stdlib imports
+from lxml.doctestcompare import LXMLOutputChecker, PARSE_XML
+
+
+def compare_xml(generated, expected):
+    """Use doctest checking from lxml for comparing XML trees. Returns diff if the two are not the same"""
+    checker = LXMLOutputChecker()
+
+    class DummyDocTest():
+        pass
+
+    ob = DummyDocTest()
+    ob.want = expected
+
+    check = checker.check_output(expected, generated, PARSE_XML)
+    if check is False:
+        diff = checker.output_difference(ob, generated, PARSE_XML)
+        return diff