Add retry for flaky tests in CI (#4755)

test/srt/test_verl_engine.py

@@ -27,7 +27,7 @@ from sglang.test.runners import (
     check_close_model_outputs,
     get_dtype_str,
 )
-from sglang.test.test_utils import is_in_ci
+from sglang.test.test_utils import CustomTestCase, is_in_ci
 
 _MAX_NEW_TOKENS = 8
 _PROMPTS = ["1+1=2, 1+2=3, 1+3=4, 1+4=5, 1+5=", "1*1=1, 1*2=2, 1*3=3, 1*4=4, 1*5="]
@@ -73,7 +73,7 @@ ALL_OTHER_MODELS = [
 ]
 
 
-class TestVerlEngine(unittest.TestCase):
+class TestVerlEngine(CustomTestCase):
     @classmethod
     def setUpClass(cls):
         multiprocessing.set_start_method("spawn")