fix test datagenerator ut fail (#28767)

python/paddle/fluid/tests/unittests/test_data_generator.py

@@ -109,29 +109,6 @@ class TestMultiSlotStringDataGenerator(unittest.TestCase):
         my_ms_dg.run_from_memory()
 
 
-class TestMultiSlotStringDataGenerator_2(unittest.TestCase):
-    def test_MyMultiSlotStringDataGenerator_stdin(self):
-        plats = platform.platform()
-        if 'Linux' not in plats:
-            print("skip pipecommand UT on MacOS/Win")
-            return
-        with open("test_queue_dataset_run_a.txt", "w") as f:
-            data = "2 1 2\n"
-            data += "2 6 2\n"
-            data += "2 5 2\n"
-            data += "2 7 2\n"
-            f.write(data)
-
-        tmp = os.popen(
-            "cat test_queue_dataset_run_a.txt | python my_data_generator.py"
-        ).readlines()
-        expected_res = [
-            '1 2 1 1 1 2\n', '1 2 1 6 1 2\n', '1 2 1 5 1 2\n', '1 2 1 7 1 2\n'
-        ]
-        self.assertEqual(tmp, expected_res)
-        os.remove("./test_queue_dataset_run_a.txt")
-
-
 class TestMultiSlotDataGenerator_error(unittest.TestCase):
     def test_MultiSlotDataGenerator_error(self):
         with self.assertRaises(ValueError):