Add party to tests_require

setup.py

@@ -51,7 +51,8 @@ for dep in info.get('depends', []):
         requires.append(get_require_version('trytond_%s' % dep))
 requires.append(get_require_version('trytond'))
 
-tests_require = [get_require_version('proteus')]
+tests_require = [get_require_version('proteus'),
+    get_require_version('trytond_party')]
 dependency_links = []
 if minor_version % 2:
     dependency_links.append('https://trydevpi.tryton.org/')