diff --git a/tests/data/test_mm_plugin.py b/tests/data/test_mm_plugin.py
index c9084af0..ea92f0df 100644
--- a/tests/data/test_mm_plugin.py
+++ b/tests/data/test_mm_plugin.py
@@ -127,6 +127,27 @@ def test_base_plugin():
     _check_plugin(**check_inputs)
 
 
+def test_cpm_o_plugin():
+    tokenizer_module = _load_tokenizer_module(model_name_or_path="openbmb/MiniCPM-V-2_6")
+    cpm_o_plugin = get_mm_plugin(name="cpm_o", image_token="<image>")
+    check_inputs = {"plugin": cpm_o_plugin, **tokenizer_module}
+    image_seqlen = 64
+    check_inputs["expected_mm_messages"] = [
+        {key: value.replace("<image>", f"<image_id>0</image_id><image>{'<unk>' * image_seqlen}</image>") for key, value in message.items()}
+        for message in MM_MESSAGES
+    ]
+    check_inputs["expected_mm_inputs"] = {
+        "pixel_values": [[]], 
+        "image_sizes": [[]], 
+        "tgt_sizes": [[]], 
+        "image_bound": [torch.tensor([], dtype=torch.int64).reshape(0,2)]
+    }
+    check_inputs["expected_no_mm_inputs"] = {
+        "image_bound": [torch.tensor([], dtype=torch.int64).reshape(0,2)]
+    }
+    _check_plugin(**check_inputs)
+
+
 def test_llava_plugin():
     image_seqlen = 576
     tokenizer_module = _load_tokenizer_module(model_name_or_path="llava-hf/llava-1.5-7b-hf")