diff --git a/data_juicer/utils/unittest_utils.py b/data_juicer/utils/unittest_utils.py
index 5806fa60b..d545dbac9 100644
--- a/data_juicer/utils/unittest_utils.py
+++ b/data_juicer/utils/unittest_utils.py
@@ -51,30 +51,31 @@ def tearDownClass(cls, hf_model_name=None) -> None:
                 shutil.rmtree(transformers.TRANSFORMERS_CACHE)
 
     @classmethod
-    def generate_dataset(cls, data, type='hf'):
+    def generate_dataset(cls, data, type='standalone'):
         """Generate dataset for a specific executor.
 
         Args:
             type (str, optional): `hf` or `ray`. Defaults to "hf".
         """
-        if type == 'hf':
+        if type.startswith('standalone'):
             return Dataset.from_list(data)
-        elif type == 'ray':
+        elif type.startswith('ray'):
             return rd.from_items(data)
+        else:
+            raise ValueError("Unsupported type")
 
     @classmethod
-    def run_single_op(cls, dataset, op, type='hf'):
+    def run_single_op(cls, dataset, op, type='standalone'):
         """Run operator in the specific executor."""
-        if type == 'hf':
+        if type.startswith('standalone'):
             if isinstance(op, Filter) and Fields.stats not in dataset.features:
-                # TODO:
-                # this is a temp solution,
-                # only add stats when calling filter op
                 dataset = dataset.add_column(name=Fields.stats,
                                              column=[{}] * dataset.num_rows)
             dataset = dataset.map(op.compute_stats)
             dataset = dataset.filter(op.process)
             dataset = dataset.select_columns(column_names=['text'])
             return dataset.to_list()
-        elif type == 'ray':
-            pass
+        elif type.startswith('ray'):
+            raise ValueError("Unsupported type")
+        else:
+            raise ValueError("Unsupported type")
\ No newline at end of file
diff --git a/tests/ops/filter/test_alphanumeric_filter.py b/tests/ops/filter/test_alphanumeric_filter.py
index 1ef5ebe2a..c0a64ffa7 100644
--- a/tests/ops/filter/test_alphanumeric_filter.py
+++ b/tests/ops/filter/test_alphanumeric_filter.py
@@ -9,7 +9,7 @@
 
 class AlphanumericFilterTest(DataJuicerTestCaseBase):
 
-    @TEST_TAG("single")
+    @TEST_TAG("standalone")
     def test_case(self):
 
         ds_list = [{
@@ -40,10 +40,10 @@ def test_case(self):
         }]
         dataset = DataJuicerTestCaseBase.generate_dataset(ds_list)
         op = AlphanumericFilter(min_ratio=0.2, max_ratio=0.9)
-        result = DataJuicerTestCaseBase.run_single_op(dataset, op)
+        result = DataJuicerTestCaseBase.run_single_op(dataset, op, AlphanumericFilterTest.current_tag,)
         self.assertEqual(result, tgt_list)
 
-    @TEST_TAG("single")
+    @TEST_TAG("standalone")
     def test_token_case(self):
 
         ds_list = [{
diff --git a/tests/run.py b/tests/run.py
index 24402fa55..a2fbeeb1c 100644
--- a/tests/run.py
+++ b/tests/run.py
@@ -22,7 +22,6 @@
 parser.add_argument('--tag', choices=["standalone", "standalone-gpu", "ray", "ray-gpu"],
                     default="standalone",
                     help="the tag of tests being run")
-parser.add_argument('--list_tests', action='store_true', help='list all tests')
 parser.add_argument('--pattern', default='test_*.py', help='test file pattern')
 parser.add_argument('--test_dir',
                     default='tests',
@@ -36,7 +35,8 @@ def __init__(self, tag=None):
         self.tag = tag
     
     def loadTestsFromTestCase(self, testCaseClass):
-
+        # set tag to testcase class
+        setattr(testCaseClass, 'current_tag', self.tag)
         test_names = self.getTestCaseNames(testCaseClass)
         loaded_suite = self.suiteClass()
         for test_name in test_names:
@@ -46,7 +46,7 @@ def loadTestsFromTestCase(self, testCaseClass):
                 loaded_suite.addTest(test_case)
         return loaded_suite
 
-def gather_test_cases(test_dir, pattern, list_tests, tag):
+def gather_test_cases(test_dir, pattern, tag):
     test_to_run = unittest.TestSuite()
     test_loader = TaggedTestLoader(tag)
     discover = test_loader.discover(test_dir, pattern=pattern, top_level_dir=None)
@@ -57,8 +57,8 @@ def gather_test_cases(test_dir, pattern, list_tests, tag):
             for test_case in test_suite:
                 if type(test_case) in SKIPPED_TESTS.modules.values():
                     continue
-                if list_tests:
-                    logger.info(f'Add test case [{str(test_case)}]')
+                logger.info(f'Add test case [{test_case._testMethodName}]'
+                            f' from {test_case.__class__.__name__}')
                 test_to_run.addTest(test_case)
     return test_to_run
 
@@ -66,11 +66,10 @@ def gather_test_cases(test_dir, pattern, list_tests, tag):
 def main():
     runner = unittest.TextTestRunner()
     test_suite = gather_test_cases(os.path.abspath(args.test_dir),
-                                   args.pattern, args.list_tests, args.tag)
-    if not args.list_tests:
-        res = runner.run(test_suite)
-        if not res.wasSuccessful():
-            exit(1)
+                                   args.pattern, args.tag)
+    res = runner.run(test_suite)
+    if not res.wasSuccessful():
+        exit(1)
 
 
 if __name__ == '__main__':