diff --git a/tests/input/test_ernie4_5_processor.py b/tests/input/test_ernie4_5_processor.py
new file mode 100644
index 00000000000..8c7386fef85
--- /dev/null
+++ b/tests/input/test_ernie4_5_processor.py
@@ -0,0 +1,341 @@
+import unittest
+from unittest.mock import MagicMock, patch
+
+import numpy as np
+
+MODULE_PATH = "fastdeploy.input.ernie4_5_processor"
+
+from fastdeploy.input.ernie4_5_processor import _SAMPLING_EPS, Ernie4_5Processor
+
+
+class MockTokenizer:
+    """A simple mock tokenizer used to simulate tokenization behavior in unit tests."""
+
+    def __init__(self):
+        self.bos_token = "<bos>"
+        self.bos_token_id = 101
+        self.eos_token = "<eos>"
+        self.eos_token_id = 102
+        self.pad_token_id = 0
+        self.vocab_size = 200
+        # Non-None value indicates chat_template support
+        self.chat_template = "dummy"
+
+    def tokenize(self, text):
+        """Return multi-token output for 'multi*' to test branching; otherwise return single-token."""
+        if text.startswith("multi"):
+            return ["multi", "word"]
+        return [text]
+
+    def convert_tokens_to_ids(self, tokens):
+        """Map tokens to synthetic IDs for branch coverage."""
+        mapping = {
+            "bad": 5,
+            " bad": 6,
+            "multi": 7,
+            "word": 8,
+            "oov": 250,
+            " oov": 251,
+            "hello": 9,
+            "REASON": 42,
+        }
+        return [mapping.get(t, 1) for t in tokens]
+
+    def decode(self, token_ids, **kwargs):
+        """Simple decode implementation returning a space-separated string."""
+        return " ".join(str(t) for t in token_ids)
+
+    def decode_token(self, token_ids, prefix_offset, read_offset):
+        """Incremental decode used to test streaming behavior."""
+        new_tokens = token_ids[read_offset:]
+        decode_str = " ".join(str(t) for t in new_tokens)
+        new_read_offset = len(token_ids)
+        return decode_str, prefix_offset, new_read_offset
+
+    def apply_chat_template(self, request_or_messages, tokenize, split_special_tokens, add_special_tokens, **kwargs):
+        """Minimal chat template implementation used by messages2ids."""
+        if isinstance(request_or_messages, dict) and "messages" in request_or_messages:
+            return " | ".join(m["content"] for m in request_or_messages["messages"])
+        return str(request_or_messages)
+
+
+class ErnieX1ReasoningParser:
+    """Mock reasoning parser to trigger reasoning-related branches during streaming."""
+
+    def __init__(self, tokenizer):
+        self.tokenizer = tokenizer
+
+    def extract_reasoning_content_streaming(
+        self,
+        previous_texts,
+        full_text,
+        delta_text,
+        previous_token_ids,
+        all_token_ids,
+        delta_token_ids,
+    ):
+        """Return a simple object with reasoning_content to cover reasoning branch."""
+
+        class ReasoningDelta:
+            def __init__(self, content):
+                self.reasoning_content = content
+
+        return ReasoningDelta("REASON")
+
+
+class MockToolParser:
+    """Mock tool parser to cover tool-related branches in both normal and streaming responses."""
+
+    def __init__(self, tokenizer):
+        self.tokenizer = tokenizer
+
+    class ToolDelta:
+        """Simple container representing detected tool calls."""
+
+        def __init__(self):
+            self.tool_calls = [{"name": "fake_tool"}]
+            self.tools_called = True
+            self.content = "tool_content"
+
+    def extract_tool_calls(self, full_text, response_dict):
+        """Used in process_response and process_response_dict_normal."""
+        return MockToolParser.ToolDelta()
+
+    def extract_tool_calls_streaming(
+        self,
+        previous_texts,
+        full_text,
+        delta_text,
+        previous_token_ids,
+        all_token_ids,
+        delta_token_ids,
+        response_dict,
+    ):
+        """Used in process_response_dict_streaming."""
+        return MockToolParser.ToolDelta()
+
+
+class TestErnie4_5Processor(unittest.TestCase):
+    """Unit tests for Ernie4_5Processor focusing on preprocessing and postprocessing logic."""
+
+    def setUp(self):
+        """Patch external dependencies: tokenizer, generation config, eos token resolution."""
+        self.gen_patcher = patch(f"{MODULE_PATH}.GenerationConfig.from_pretrained", return_value=MagicMock())
+        self.tokenizer_patcher = patch(
+            f"{MODULE_PATH}.Ernie4_5Tokenizer.from_pretrained", side_effect=lambda path: MockTokenizer()
+        )
+        self.eos_patcher = patch(
+            "paddleformers.trl.llm_utils.get_eos_token_id",
+            side_effect=lambda tokenizer, cfg: [tokenizer.eos_token_id],
+        )
+
+        self.gen_patcher.start()
+        self.tokenizer_patcher.start()
+        self.eos_patcher.start()
+
+    def tearDown(self):
+        """Stop all patches after each test."""
+        self.gen_patcher.stop()
+        self.tokenizer_patcher.stop()
+        self.eos_patcher.stop()
+
+    def _make_processor(self, reasoning=False, tool=False):
+        """Helper for creating a processor with optional reasoning/tool parser support."""
+        reasoning_cls = ErnieX1ReasoningParser if reasoning else None
+        tool_cls = MockToolParser if tool else None
+        proc = Ernie4_5Processor("dummy-model", reasoning_parser_obj=reasoning_cls, tool_parser_obj=tool_cls)
+        proc._apply_default_parameters = lambda req: req
+        return proc
+
+    def test_update_bad_words(self):
+        """Verify filtering, multi-token skipping, and OOV behavior in update_bad_words."""
+        proc = self._make_processor()
+
+        bad_words = ["bad", "multi", "oov"]
+        token_ids = proc.update_bad_words(bad_words, bad_words_token_ids=None)
+
+        self.assertEqual(token_ids, [5, 6, 1])
+
+    def test_process_request_dict_with_prompt_string(self):
+        """Test prompt-based tokenization, truncation, and temperature/top_p correction."""
+        proc = self._make_processor()
+        req = {
+            "prompt": "hello",
+            "temperature": 0.0,
+            "top_p": 0.0,
+        }
+
+        processed = proc.process_request_dict(req, max_model_len=10)
+
+        self.assertIn("eos_token_ids", processed)
+        self.assertEqual(processed["eos_token_ids"], [proc.tokenizer.eos_token_id])
+
+        expected_ids = proc.tokenizer.convert_tokens_to_ids(proc.tokenizer.tokenize("hello"))
+        self.assertEqual(processed["prompt_token_ids"], expected_ids)
+
+        self.assertEqual(processed["max_tokens"], max(1, 10 - len(expected_ids)))
+        self.assertEqual(processed["temperature"], 1)
+        self.assertAlmostEqual(processed["top_p"], _SAMPLING_EPS)
+        self.assertEqual(processed["prompt_tokens"], "hello")
+
+    def test_pad_batch_data_right_and_left_and_empty(self):
+        """Test left/right padding and empty input behavior."""
+        proc = self._make_processor()
+
+        insts = [[1, 2], [3]]
+
+        padded, seq_len = proc.pad_batch_data(
+            insts, pad_id=0, return_seq_len=True, return_array=True, pad_style="right"
+        )
+        np.testing.assert_array_equal(padded, np.array([[1, 2], [3, 0]], dtype=np.int64))
+        np.testing.assert_array_equal(seq_len, np.array([[2], [1]], dtype=np.int64))
+
+        padded_left, seq_len_left = proc.pad_batch_data(
+            insts, pad_id=0, return_seq_len=True, return_array=True, pad_style="left"
+        )
+        np.testing.assert_array_equal(padded_left, np.array([[1, 2], [0, 3]], dtype=np.int64))
+        np.testing.assert_array_equal(seq_len_left, np.array([[2], [1]], dtype=np.int64))
+
+        padded_empty, seq_len_empty = proc.pad_batch_data(
+            [], pad_id=0, return_seq_len=True, return_array=True, pad_style="right"
+        )
+        np.testing.assert_array_equal(padded_empty, np.array([[]], dtype=np.int64))
+        np.testing.assert_array_equal(seq_len_empty, np.array([], dtype=np.int64))
+
+    def test_process_response_dict_streaming_with_reasoning_and_tool(self):
+        """Ensure streaming mode handles reasoning and tool-call parsing correctly."""
+        proc = self._make_processor(reasoning=True, tool=True)
+
+        response = {
+            "finished": True,
+            "request_id": "req-1",
+            "outputs": {"token_ids": [10, 11]},
+        }
+
+        result = proc.process_response_dict_streaming(
+            response, enable_thinking=False, include_stop_str_in_output=False
+        )
+
+        outputs = result["outputs"]
+
+        self.assertIn("completion_tokens", outputs)
+        self.assertIn("text", outputs)
+        self.assertEqual(outputs["completion_tokens"], outputs["text"])
+
+        self.assertIn("reasoning_token_num", outputs)
+        self.assertGreaterEqual(outputs["reasoning_token_num"], 0)
+
+        self.assertIn("delta_message", outputs)
+        delta_msg = outputs["delta_message"]
+        self.assertTrue(hasattr(delta_msg, "tool_calls"))
+
+        self.assertNotIn("req-1", proc.decode_status)
+        self.assertNotIn("req-1", proc.tool_parser_dict)
+
+    def test_update_stop_seq(self):
+        """Test stop sequence tokenization and padding."""
+        proc = self._make_processor()
+
+        stop_seqs, stop_lens = proc.update_stop_seq("stop")
+        self.assertIsInstance(stop_seqs, list)
+        self.assertIsInstance(stop_lens, list)
+
+        stop_seqs2, stop_lens2 = proc.update_stop_seq(["stop", "hello"])
+        self.assertEqual(len(stop_seqs2), 2)
+        self.assertEqual(len(stop_lens2), 2)
+
+    def test_process_request_chat_template_kwargs(self):
+        """Test chat_template_kwargs application inside process_request."""
+
+        proc = self._make_processor()
+
+        class ReqObj(dict):
+            """Mock request object supporting attributes, set(), and to_dict()."""
+
+            def set(self, k, v):
+                self[k] = v
+
+            def __getattr__(self, item):
+                return self.get(item, None)
+
+            def to_dict(self):
+                return dict(self)
+
+        request = ReqObj(
+            {
+                "messages": [{"role": "user", "content": "hello"}],
+                "temperature": 0.5,
+                "top_p": 0.5,
+            }
+        )
+
+        processed = proc.process_request(request, max_model_len=20, chat_template_kwargs={"extra": "VALUE"})
+
+        self.assertEqual(processed.eos_token_ids, [proc.tokenizer.eos_token_id])
+
+        expected_ids = proc.tokenizer.convert_tokens_to_ids(proc.tokenizer.tokenize("hello"))
+        self.assertIsNotNone(processed.prompt_token_ids)
+        self.assertEqual(processed.prompt_token_ids, expected_ids)
+
+        self.assertIn("max_tokens", processed)
+        self.assertEqual(processed["max_tokens"], max(1, 20 - len(expected_ids)))
+
+    def test_process_request_dict_chat_template_kwargs(self):
+        """Test chat_template_kwargs insertion in process_request_dict."""
+        proc = self._make_processor()
+
+        req = {
+            "messages": [{"role": "user", "content": "hey"}],
+            "chat_template_kwargs": {"A": "B"},
+            "temperature": 0.5,
+            "top_p": 0.5,
+        }
+
+        result = proc.process_request_dict(req, max_model_len=30)
+
+        self.assertIn("prompt_token_ids", result)
+        self.assertEqual(result["A"], "B")
+
+    def test_init_generation_config_exception(self):
+        """Test fallback behavior when GenerationConfig loading fails."""
+        with patch(f"{MODULE_PATH}.GenerationConfig.from_pretrained", side_effect=Exception("fail")):
+            proc = self._make_processor()
+            self.assertIsNone(proc.generation_config)
+
+    def test_process_response_with_tool_parser(self):
+        """Verify tool_call extraction in process_response."""
+        proc = self._make_processor(tool=True)
+
+        class RespObj:
+            """Mock response carrying token_ids and index for testing."""
+
+            def __init__(self):
+                self.request_id = "reqx"
+                self.outputs = MagicMock()
+                self.outputs.token_ids = [9, proc.tokenizer.eos_token_id]
+                self.outputs.index = 0
+
+        resp = RespObj()
+        result = proc.process_response(resp)
+
+        self.assertTrue(hasattr(result.outputs, "tool_calls"))
+        self.assertEqual(result.outputs.tool_calls[0]["name"], "fake_tool")
+
+    def test_process_response_dict_normal_with_tool(self):
+        """Verify tool_call extraction in normal (non-streaming) response mode."""
+        proc = self._make_processor(tool=True)
+
+        resp = {
+            "finished": True,
+            "request_id": "task-99",
+            "outputs": {"token_ids": [10, 11], "text": ""},
+        }
+
+        result = proc.process_response_dict_normal(resp, enable_thinking=False, include_stop_str_in_output=False)
+
+        self.assertIn("tool_call", result["outputs"])
+        self.assertEqual(result["outputs"]["tool_call"][0]["name"], "fake_tool")
+
+
+if __name__ == "__main__":
+    unittest.main()