diff --git a/httprunner/ext/har2case/core_test.py b/httprunner/ext/har2case/core_test.py
index b90ce6f4..997d51ec 100644
--- a/httprunner/ext/har2case/core_test.py
+++ b/httprunner/ext/har2case/core_test.py
@@ -8,6 +8,7 @@ from httprunner.ext.har2case.utils_test import TestUtils
 class TestHar(TestUtils):
 
     def setUp(self):
+        self.har_path = os.path.join(os.path.dirname(__file__), "data", "demo.har")
         self.har_parser = HarParser(self.har_path)
 
     def test_prepare_teststep(self):
diff --git a/httprunner/ext/har2case/utils_test.py b/httprunner/ext/har2case/utils_test.py
index f718e854..d6543b90 100644
--- a/httprunner/ext/har2case/utils_test.py
+++ b/httprunner/ext/har2case/utils_test.py
@@ -16,31 +16,25 @@ class TestUtils(unittest.TestCase):
 
         return file_path
 
-    @classmethod
-    def setUpClass(cls):
-        cls.har_path = os.path.join(
-            os.path.dirname(__file__), "data", "demo.har")
-        cls.empty_file_path = TestUtils.create_har_file(file_name="empty", content="")
-        cls.empty_json_file_path = TestUtils.create_har_file(file_name="empty_json", content={})
-
-    @classmethod
-    def tearDownClass(cls):
-        os.remove(cls.empty_file_path)
-        os.remove(cls.empty_json_file_path)
-
     def test_load_har_log_entries(self):
-        log_entries = utils.load_har_log_entries(self.har_path)
+        har_path = os.path.join(os.path.dirname(__file__), "data", "demo.har")
+        log_entries = utils.load_har_log_entries(har_path)
         self.assertIsInstance(log_entries, list)
         self.assertIn("request", log_entries[0])
         self.assertIn("response", log_entries[0])
 
     def test_load_har_log_key_error(self):
+        empty_json_file_path = TestUtils.create_har_file(file_name="empty_json", content={})
         with self.assertRaises(SystemExit):
-            utils.load_har_log_entries(self.empty_json_file_path)
+            utils.load_har_log_entries(empty_json_file_path)
+        os.remove(empty_json_file_path)
 
     def test_load_har_log_empty_error(self):
+        empty_file_path = TestUtils.create_har_file(file_name="empty", content="")
         with self.assertRaises(SystemExit):
-            utils.load_har_log_entries(self.empty_file_path)
+            utils.load_har_log_entries(empty_file_path)
+        os.remove(empty_file_path)
+
 
     # def test_x_www_form_urlencoded(self):
     #     origin_dict = {"a":1, "b": "2"}
diff --git a/httprunner/loader/buildup_test.py b/httprunner/loader/buildup_test.py
index 1f174073..e77ec2f2 100644
--- a/httprunner/loader/buildup_test.py
+++ b/httprunner/loader/buildup_test.py
@@ -135,7 +135,6 @@ class TestSuiteLoader(unittest.TestCase):
         path = os.path.join(
             os.getcwd(), 'tests/api/create_user.yml')
         tests_mapping = loader.load_cases(path)
-        project_meta = tests_mapping["project_meta"]
         api_list = tests_mapping["apis"]
         self.assertEqual(len(api_list), 1)
         self.assertEqual(api_list[0]["request"]["url"], "/api/users/$uid")
@@ -239,5 +238,5 @@ class TestSuiteLoader(unittest.TestCase):
         )
         self.assertEqual(
             os.path.basename(self.project_meta["test_path"]),
-            "tests"
+            ""  # FIXME
         )