diff --git a/tests/test_litellm/llms/deepseek/chat/test_deepseek_chat_transformation.py b/tests/test_litellm/llms/deepseek/chat/test_deepseek_chat_transformation.py
new file mode 100644
index 00000000000..38d7d351c9e
--- /dev/null
+++ b/tests/test_litellm/llms/deepseek/chat/test_deepseek_chat_transformation.py
@@ -0,0 +1,41 @@
+from typing import Final
+
+import pytest
+
+from litellm.llms.deepseek.chat.transformation import DeepSeekChatConfig
+
+
+@pytest.mark.parametrize(
+    "model", ("deepseek-flash", "deepseek-v4-pro", "deepseek-v4-flash-vision-exp", "deepseek/deepseek-v4-flash")
+)
+@pytest.mark.parametrize("effort", ("minimal", "low", "medium", "high", "xhigh", "max", "ultra"))
+@pytest.mark.parametrize("thinking", (None, "enabled"))
+def test_v4_keeps_requested_effort_with_enabled_thinking(model: str, effort: str, thinking: str | None) -> None:
+    params: Final = {"reasoning_effort": effort, **({"thinking": {"type": thinking}} if thinking else {})}
+    result: Final = DeepSeekChatConfig().map_openai_params(params, {}, model, False)
+    assert result == {"thinking": {"type": "enabled"}, "reasoning_effort": effort}
+
+
+@pytest.mark.parametrize(
+    "thinking,effort,expected",
+    (
+        (None, None, {}),
+        (None, "none", {"thinking": {"type": "disabled"}}),
+        ("disabled", "low", {"thinking": {"type": "disabled"}}),
+        ("disabled", "max", {"thinking": {"type": "disabled"}}),
+        ("enabled", "none", {"thinking": {"type": "enabled"}}),
+        ("enabled", None, {"thinking": {"type": "enabled"}}),
+    ),
+)
+def test_v4_retains_explicit_thinking_precedence(
+    thinking: str | None, effort: str | None, expected: dict[str, dict[str, str]]
+) -> None:
+    params: Final = {"reasoning_effort": effort, **({"thinking": {"type": thinking}} if thinking else {})}
+    result: Final = DeepSeekChatConfig().map_openai_params(params, {}, "deepseek-flash", False)
+    assert result == expected
+
+
+@pytest.mark.parametrize("model", ("deepseek-chat", "deepseek-reasoner", "deepseek/deepseek-reasoner"))
+def test_legacy_models_retain_toggle_only_mapping(model: str) -> None:
+    result: Final = DeepSeekChatConfig().map_openai_params({"reasoning_effort": "low"}, {}, model, False)
+    assert result == {"thinking": {"type": "enabled"}}
diff --git a/tests/unit/llms/deepseek/chat/test_deepseek_chat_transformation.py b/tests/unit/llms/deepseek/chat/test_deepseek_chat_transformation.py
index 93a5a69075a..3f93264d0d0 100644
--- a/tests/unit/llms/deepseek/chat/test_deepseek_chat_transformation.py
+++ b/tests/unit/llms/deepseek/chat/test_deepseek_chat_transformation.py
@@ -1,47 +1,7 @@
-from typing import Final
-
-import pytest
-
 import litellm
 from litellm.llms.deepseek.chat.transformation import DeepSeekChatConfig
 
 
-@pytest.mark.parametrize(
-    "model", ("deepseek-flash", "deepseek-v4-pro", "deepseek-v4-flash-vision-exp", "deepseek/deepseek-v4-flash")
-)
-@pytest.mark.parametrize("effort", ("minimal", "low", "medium", "high", "xhigh", "max", "ultra"))
-@pytest.mark.parametrize("thinking", (None, "enabled"))
-def test_v4_keeps_requested_effort_with_enabled_thinking(model: str, effort: str, thinking: str | None) -> None:
-    params: Final = {"reasoning_effort": effort, **({"thinking": {"type": thinking}} if thinking else {})}
-    result: Final = DeepSeekChatConfig().map_openai_params(params, {}, model, False)
-    assert result == {"thinking": {"type": "enabled"}, "reasoning_effort": effort}
-
-
-@pytest.mark.parametrize(
-    "thinking,effort,expected",
-    (
-        (None, None, {}),
-        (None, "none", {"thinking": {"type": "disabled"}}),
-        ("disabled", "low", {"thinking": {"type": "disabled"}}),
-        ("disabled", "max", {"thinking": {"type": "disabled"}}),
-        ("enabled", "none", {"thinking": {"type": "enabled"}}),
-        ("enabled", None, {"thinking": {"type": "enabled"}}),
-    ),
-)
-def test_v4_retains_explicit_thinking_precedence(
-    thinking: str | None, effort: str | None, expected: dict[str, dict[str, str]]
-) -> None:
-    params: Final = {"reasoning_effort": effort, **({"thinking": {"type": thinking}} if thinking else {})}
-    result: Final = DeepSeekChatConfig().map_openai_params(params, {}, "deepseek-flash", False)
-    assert result == expected
-
-
-@pytest.mark.parametrize("model", ("deepseek-chat", "deepseek-reasoner", "deepseek/deepseek-reasoner"))
-def test_legacy_models_retain_toggle_only_mapping(model: str) -> None:
-    result: Final = DeepSeekChatConfig().map_openai_params({"reasoning_effort": "low"}, {}, model, False)
-    assert result == {"thinking": {"type": "enabled"}}
-
-
 def _function_tool(name: str) -> dict:
     return {
         "type": "function",