update to support --bt5_path argument

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15721 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/tests/testXHTML.py

@@ -50,7 +50,8 @@ except ImportError:
 # Test Setting
 #
 INSTANCE_HOME = os.environ['INSTANCE_HOME']
-bt5_base_path = os.path.join(INSTANCE_HOME, 'bt5')
+bt5_base_path = os.environ.get('erp5_tests_bt5_path',
+                               os.path.join(INSTANCE_HOME, 'bt5'))
 
 # dependency order
 target_business_templates = (