diff --git a/.github/workflows/unit-test.yml b/.github/workflows/unit-test.yml
index 752c05da7..6ab371603 100644
--- a/.github/workflows/unit-test.yml
+++ b/.github/workflows/unit-test.yml
@@ -29,10 +29,8 @@ jobs:
     - name: Install dependencies
       run: |
         pip install --upgrade pip
-        pip install -e "python[all]"
+        pip install -e "python[dev]"
         pip install flashinfer -i https://flashinfer.ai/whl/cu121/torch2.4/ --force-reinstall
-        pip install accelerate
-        pip install sentence_transformers
 
     - name: Test Backend Runtime
       timeout-minutes: 20
diff --git a/python/pyproject.toml b/python/pyproject.toml
index 6b1b032fd..4908ad051 100644
--- a/python/pyproject.toml
+++ b/python/pyproject.toml
@@ -27,7 +27,7 @@ srt = ["aiohttp", "decord", "fastapi", "hf_transfer", "huggingface_hub", "intere
 openai = ["openai>=1.0", "tiktoken"]
 anthropic = ["anthropic>=0.20.0"]
 litellm = ["litellm>=1.0.0"]
-test = ["jsonlines", "matplotlib", "pandas"]
+test = ["jsonlines", "matplotlib", "pandas", "sentence_transformers", "accelerate"]
 all = ["sglang[srt]", "sglang[openai]", "sglang[anthropic]", "sglang[litellm]"]
 dev = ["sglang[all]", "sglang[test]"]
 
diff --git a/python/sglang/srt/managers/tokenizer_manager.py b/python/sglang/srt/managers/tokenizer_manager.py
index 3f25ad560..c74251947 100644
--- a/python/sglang/srt/managers/tokenizer_manager.py
+++ b/python/sglang/srt/managers/tokenizer_manager.py
@@ -427,12 +427,10 @@ class TokenizerManager:
         return sampling_params
 
     async def _get_pixel_values(self, image_data):
-        if isinstance(image_data, list) and len(image_data) > 0:
-            return await self._get_pixel_values_internal(image_data)
-        elif isinstance(image_data, str):
-            return await self._get_pixel_values_internal(image_data)
-        else:
+        if image_data is None:
             return None, None, None
+        else:
+            return await self._get_pixel_values_internal(image_data)
 
     async def _wait_for_response(
         self,
diff --git a/python/sglang/test/test_utils.py b/python/sglang/test/test_utils.py
index 046886399..59e2ab292 100644
--- a/python/sglang/test/test_utils.py
+++ b/python/sglang/test/test_utils.py
@@ -465,7 +465,7 @@ def run_unittest_files(files: List[str], timeout_per_file: float):
 
         def run_one_file(filename):
             filename = os.path.join(os.getcwd(), filename)
-            print(f"\n\nRun {filename}\n\n")
+            print(f"\n\nRun {filename}\n\n", flush=True)
             process = subprocess.Popen(
                 ["python3", filename], stdout=None, stderr=None, env=os.environ
             )
@@ -481,15 +481,16 @@ def run_unittest_files(files: List[str], timeout_per_file: float):
             kill_child_process(process.pid)
             time.sleep(5)
             print(
-                f"\nTimeout after {timeout_per_file} seconds when running {filename}\n"
+                f"\nTimeout after {timeout_per_file} seconds when running {filename}\n",
+                flush=True,
             )
             success = False
             break
 
     if success:
-        print(f"Success. Time elapsed: {time.time() - tic:.2f}s")
+        print(f"Success. Time elapsed: {time.time() - tic:.2f}s", flush=True)
     else:
-        print(f"Fail. Time elapsed: {time.time() - tic:.2f}s")
+        print(f"Fail. Time elapsed: {time.time() - tic:.2f}s", flush=True)
 
     return 0 if success else -1