Revert removing the unused imports (#385)

test/lang/run_all.py

@@ -1,6 +1,7 @@
 import argparse
 import glob
 import multiprocessing
+import os
 import time
 import unittest
 

test/lang/test_anthropic_backend.py

@@ -1,3 +1,4 @@
+import json
 import unittest
 
 from sglang import Anthropic, set_default_backend

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,

test/lang/test_tracing.py

@@ -110,7 +110,7 @@ class TestTracing(unittest.TestCase):
             forks = s.fork(3)
             for i in range(3):
                 forks[i] += f"Now, expand tip {i+1} into a paragraph:\n"
-                forks[i] += sgl.gen("detailed_tip")
+                forks[i] += sgl.gen(f"detailed_tip")
 
             s += "Tip 1:" + forks[0]["detailed_tip"] + "\n"
             s += "Tip 2:" + forks[1]["detailed_tip"] + "\n"