test(provider): add tests for chuizi provider routing + fix prefix handling

- Add chuizi provider block in _get_openai_compatible_provider_info
  for prefix routing (chuizi/model-name -> api_base + api_key)
- Add 2 tests: prefix routing and API key env var resolution

This fixes codecov patch coverage for the chuizi provider addition.

litellm/litellm_core_utils/get_llm_provider_logic.py

@@ -683,6 +683,15 @@ def _get_openai_compatible_provider_info(  # noqa: PLR0915
         ) = litellm.LMStudioChatConfig()._get_openai_compatible_provider_info(
             api_base, api_key
         )
+    elif custom_llm_provider == "chuizi":
+        # chuizi is openai compatible, unified AI gateway
+        api_base = (
+            api_base
+            or get_secret("CHUIZI_API_BASE")
+            or "https://api.chuizi.ai/v1"
+        )  # type: ignore
+
+        dynamic_api_key = api_key or get_secret_str("CHUIZI_API_KEY")
     elif custom_llm_provider == "deepseek":
         # deepseek is openai compatible, we just need to set this to custom_openai and have the api_base be https://api.deepseek.com/v1
         api_base = (

tests/local_testing/test_get_llm_provider.py

@@ -420,3 +420,25 @@ def test_get_llm_provider_use_proxy_arg_true_with_direct_args():
     assert provider == "litellm_proxy"
     assert key == arg_api_key  # Should use the argument key
     assert base == arg_api_base # Should use the argument base
+
+
+def test_get_llm_provider_chuizi():
+    """Test that chuizi/ prefix routes to chuizi provider."""
+    model, custom_llm_provider, dynamic_api_key, api_base = litellm.get_llm_provider(
+        model="chuizi/anthropic/claude-sonnet-4-6",
+    )
+    assert custom_llm_provider == "chuizi"
+    assert model == "anthropic/claude-sonnet-4-6"
+    assert api_base == "https://api.chuizi.ai/v1"
+
+
+def test_get_llm_provider_chuizi_with_api_key():
+    """Test that chuizi provider resolves CHUIZI_API_KEY from env."""
+    os.environ["CHUIZI_API_KEY"] = "test-chuizi-key"
+    model, custom_llm_provider, dynamic_api_key, api_base = litellm.get_llm_provider(
+        model="chuizi/openai/gpt-4.1",
+    )
+    assert custom_llm_provider == "chuizi"
+    assert model == "openai/gpt-4.1"
+    assert dynamic_api_key == "test-chuizi-key"
+    os.environ.pop("CHUIZI_API_KEY", None)