refactor: use HttpRunner as testcase base class

examples/postman_echo/request_methods/hardcode_test.py

@@ -1,8 +1,8 @@
 # NOTICE: Generated By HttpRunner. DO'NOT EDIT!
-from httprunner import HttpRunner, TConfig, TStep, TestCase
+from httprunner import HttpRunner, TConfig, TStep
 
 
-class TestCaseHardcode(TestCase):
+class TestCaseHardcode(HttpRunner):
     config = TConfig(
         **{
             "name": "request methods testcase in hardcode",
@@ -72,5 +72,6 @@ class TestCaseHardcode(TestCase):
         ),
     ]
 
-    def test_start(self):
-        HttpRunner(self.config, self.teststeps).run()
+
+if __name__ == "__main__":
+    TestCaseHardcode().test_start()