set_os_environ before parsing testcase, unset_os_environ after parsing testcase

tests/debugtalk.py

@@ -7,7 +7,6 @@ import time
 from tests.api_server import HTTPBIN_SERVER, SECRET_KEY, gen_md5, get_sign
 
 BASE_URL = "http://127.0.0.1:5000"
-UserName = os.environ['UserName']
 
 
 demo_default_request = {

tests/test_loader.py

@@ -565,7 +565,6 @@ class TestSuiteLoader(unittest.TestCase):
         path = os.path.join(
             os.getcwd(), 'tests/data/demo_locust.yml')
         locust_tests = loader.load_locust_tests(path)
-        self.assertEqual(locust_tests["config"]["variables"]["UserName"], "debugtalk")
         self.assertEqual(len(locust_tests["tests"]), 10)
         self.assertEqual(locust_tests["tests"][0][0]["name"], "index")
         self.assertEqual(locust_tests["tests"][9][0]["name"], "user-agent")