Revert removing the unused imports (#385)

test/lang/test_srt_backend.py

@@ -2,6 +2,7 @@
 python3 -m sglang.launch_server --model-path meta-llama/Llama-2-7b-chat-hf --port 30000
 """
 
+import json
 import unittest
 
 import sglang as sgl
@@ -12,6 +13,8 @@ from sglang.test.test_programs import (
     test_few_shot_qa,
     test_mt_bench,
     test_parallel_decoding,
+    test_parallel_encoding,
+    test_react,
     test_regex,
     test_select,
     test_stream,