compatibility to Tryton 6.0

tests/__init__.py

@@ -2,3 +2,18 @@
 # This file is part of the document-incoming-invoice-xml-module
 # from m-ds for Tryton. The COPYRIGHT file at the top level of
 # this repository contains the full copyright notices and license terms.
+
+
+import trytond.tests.test_tryton
+import unittest
+from .test_module import XmlIncomingTestCase
+
+
+__all__ = ['suite']
+
+
+def suite():
+    suite = trytond.tests.test_tryton.suite()
+    suite.addTests(unittest.TestLoader().loadTestsFromTestCase(
+        XmlIncomingTestCase))
+    return suite