add registeration test

tests/integration/scoring/test_scoring.py

@@ -15,14 +15,68 @@ def sample_judge_prompt_template():
     return "Output a number response in the following format: Score: <number>, where <number> is the number between 0 and 9."
 
 
+@pytest.fixture
+def sample_scoring_fn_id():
+    return "llm-as-judge-test-prompt"
+
+
+def register_scoring_function(
+    llama_stack_client,
+    provider_id,
+    scoring_fn_id,
+    judge_model_id,
+    judge_prompt_template,
+):
+    llama_stack_client.scoring_functions.register(
+        scoring_fn_id=scoring_fn_id,
+        provider_id=provider_id,
+        description="LLM as judge scoring function with test prompt",
+        return_type={
+            "type": "string",
+        },
+        params={
+            "type": "llm_as_judge",
+            "judge_model": judge_model_id,
+            "prompt_template": judge_prompt_template,
+        },
+    )
+
+
 def test_scoring_functions_list(llama_stack_client):
-    # NOTE: this needs you to ensure that you are starting from a clean state
-    # but so far we don't have an unregister API unfortunately, so be careful
     response = llama_stack_client.scoring_functions.list()
     assert isinstance(response, list)
     assert len(response) > 0
 
 
+def test_scoring_functions_register(
+    llama_stack_client,
+    sample_scoring_fn_id,
+    judge_model_id,
+    sample_judge_prompt_template,
+):
+    llm_as_judge_provider = [
+        x
+        for x in llama_stack_client.providers.list()
+        if x.api == "scoring" and x.provider_type == "inline::llm-as-judge"
+    ]
+    if len(llm_as_judge_provider) == 0:
+        pytest.skip("No llm-as-judge provider found, cannot test registeration")
+
+    llm_as_judge_provider_id = llm_as_judge_provider[0].provider_id
+    register_scoring_function(
+        llama_stack_client,
+        llm_as_judge_provider_id,
+        sample_scoring_fn_id,
+        judge_model_id,
+        sample_judge_prompt_template,
+    )
+
+    list_response = llama_stack_client.scoring_functions.list()
+    assert isinstance(list_response, list)
+    assert len(list_response) > 0
+    assert any(x.identifier == sample_scoring_fn_id for x in list_response)
+
+
 def test_scoring_score(llama_stack_client):
     register_dataset(llama_stack_client, for_rag=True)
     response = llama_stack_client.datasets.list()