Add mock to tests_require

Needed for account_stock_anglo_saxon tools

setup.py

@@ -53,6 +53,7 @@ for dep in info.get('extras_depend', []):
         extras_require[dep] = get_require_version('trytond_%s' % dep)
 
 tests_require = [get_require_version('proteus'),
+    'mock',  # For account_stock_anglo_saxon tests tools
     get_require_version('trytond_account_stock_continental'),
     get_require_version('trytond_account_stock_anglo_saxon')]
 dependency_links = []