Add Ollama client tests

tests/infrastructure/test_llm.py

@@ -0,0 +1,86 @@
+from contextlib import contextmanager
+from unittest.mock import AsyncMock, MagicMock, patch
+
+import httpx
+import pytest
+
+from src.config import settings
+from src.infrastructure import llm
+
+
+@contextmanager
+def mock_async_client(json_data=None, raise_for_status_side_effect=None):
+    response = MagicMock()
+    response.json.return_value = json_data or {}
+    response.raise_for_status.side_effect = raise_for_status_side_effect
+
+    client = AsyncMock()
+    client.post = AsyncMock(return_value=response)
+
+    with patch("src.infrastructure.llm.httpx.AsyncClient") as mocked_async_client_cls:
+        mocked_context_manager = AsyncMock()
+        mocked_context_manager.__aenter__.return_value = client
+        mocked_context_manager.__aexit__.return_value = None
+        mocked_async_client_cls.return_value = mocked_context_manager
+
+        yield client, response
+
+
+def test_embed_document_prefix_value_is_pinned():
+    assert llm.EMBED_DOCUMENT_PREFIX == "search_document: "
+
+
+async def test_embed_uses_query_prefix_and_embedding_model():
+    fake_embedding = [0.0] * settings.embedding_dim
+    with mock_async_client(json_data={"embedding": fake_embedding}) as (client, _):
+        result = await llm.embed("hello", is_query=True)
+
+        assert result == fake_embedding
+        args, kwargs = client.post.call_args
+        assert args[0].endswith("/api/embeddings")
+        assert kwargs["json"]["model"] == settings.ollama_embedding_model
+        assert kwargs["json"]["prompt"] == f"{llm.EMBED_QUERY_PREFIX}hello"
+
+
+async def test_embed_uses_document_prefix():
+    fake_embedding = [0.0] * settings.embedding_dim
+
+    with mock_async_client(json_data={"embedding": fake_embedding}) as (client, _):
+        await llm.embed("hello", is_query=False)
+
+        _, kwargs = client.post.call_args
+        assert kwargs["json"]["prompt"] == f"{llm.EMBED_DOCUMENT_PREFIX}hello"
+
+
+async def test_embed_raises_value_error_on_dimension_mismatch():
+    wrong_embedding = [0.0] * (settings.embedding_dim - 1)
+    with mock_async_client(json_data={"embedding": wrong_embedding}):
+        with pytest.raises(ValueError, match="mismatch"):
+            await llm.embed("hello", is_query=True)
+
+
+async def test_chat_uses_chat_model_and_returns_message_content():
+    messages = [{"role": "user", "content": "hello"}]
+
+    with mock_async_client(json_data={"message": {"content": "hi back"}}) as (client, _):
+        result = await llm.chat(messages)
+
+        assert result == "hi back"
+        args, kwargs = client.post.call_args
+        assert args[0].endswith("/api/chat")
+        assert kwargs["json"]["model"] == settings.ollama_chat_model
+        assert kwargs["json"]["messages"] == messages
+        assert kwargs["json"]["stream"] is False
+
+
+async def test_http_errors_propagate_for_embed_and_chat():
+    request = httpx.Request("POST", "http://test/api")
+    response = httpx.Response(500, request=request)
+    error = httpx.HTTPStatusError("boom", request=request, response=response)
+
+    with mock_async_client(json_data={}, raise_for_status_side_effect=error):
+        with pytest.raises(httpx.HTTPStatusError):
+            await llm.embed("hello", is_query=True)
+
+        with pytest.raises(httpx.HTTPStatusError):
+            await llm.chat([{"role": "user", "content": "hello"}])