Add docstrings for clarity in LLM backend tests, remove unused imports, and update CLAUDE.md with test-writing guidance.

Author: coordt

CLAUDE.md

@@ -20,6 +20,8 @@ pre-commit install             # install git hooks
 
 Always add `--agent-digest=term` when running pytest to see token-optimized test results.
 
+Use the python-tester skill when writing Python tests.
+
 ```bash
 uv run pytest --agent-digest=term                  # run all tests with coverage
 uv run pytest --agent-digest=term tests/test_config.py # run a single test file

tests/test_config.py

@@ -7,7 +7,6 @@
 
 from foreman.config import ConfigError, ForemanConfig, load_config
 
-
 VALID_YAML = textwrap.dedent("""\
     identity:
       github_token: "ghp_test_token"

tests/test_llm_backends.py

@@ -22,12 +22,16 @@ def load_fixture(name: str) -> dict:
 
 
 class TestAnthropicBackend:
+    """Tests for the Anthropic LLM backend."""
+
     def test_instantiates_with_config(self):
+        """Test that the backend can be instantiated with a valid configuration."""
         cfg = LLMConfig(provider="anthropic", model="claude-sonnet-4-6", api_key="test-key")
         backend = AnthropicBackend(cfg)
         assert isinstance(backend, AnthropicBackend)
 
     def test_complete_returns_string(self):
+        """Test that the complete method returns a string response."""
         fixture = load_fixture("anthropic_triage_response.json")
         cfg = LLMConfig(provider="anthropic", model="claude-sonnet-4-6", api_key="test-key")
         backend = AnthropicBackend(cfg)
@@ -43,6 +47,7 @@ def test_complete_returns_string(self):
         assert result == fixture["content"]
 
     def test_complete_with_system_prompt(self):
+        """Test that the complete method correctly handles a system prompt."""
         cfg = LLMConfig(provider="anthropic", model="claude-sonnet-4-6", api_key="test-key")
         backend = AnthropicBackend(cfg)
 
@@ -58,6 +63,7 @@ def test_complete_with_system_prompt(self):
             assert any(m.get("role") == "system" for m in messages)
 
     def test_complete_passes_model_to_litellm(self):
+        """Test that the correct model name is passed to the underlying LiteLLM call."""
         cfg = LLMConfig(provider="anthropic", model="claude-sonnet-4-6", api_key="test-key")
         backend = AnthropicBackend(cfg)
 
@@ -73,12 +79,16 @@ def test_complete_passes_model_to_litellm(self):
 
 
 class TestOllamaBackend:
+    """Tests for the Ollama LLM backend."""
+
     def test_instantiates_with_config(self):
+        """Test that the backend can be instantiated with a valid configuration."""
         cfg = LLMConfig(provider="ollama", model="llama3")
         backend = OllamaBackend(cfg)
         assert isinstance(backend, OllamaBackend)
 
     def test_complete_returns_string(self):
+        """Test that the complete method returns a string response."""
         fixture = load_fixture("ollama_triage_response.json")
         cfg = LLMConfig(provider="ollama", model="llama3")
         backend = OllamaBackend(cfg)
@@ -94,6 +104,7 @@ def test_complete_returns_string(self):
         assert result == fixture["content"]
 
     def test_complete_with_system_prompt(self):
+        """Test that the complete method correctly handles a system prompt."""
         cfg = LLMConfig(provider="ollama", model="llama3")
         backend = OllamaBackend(cfg)
 
@@ -108,6 +119,7 @@ def test_complete_with_system_prompt(self):
             assert any(m.get("role") == "system" for m in messages)
 
     def test_complete_passes_ollama_model_format(self):
+        """Test that the model name is passed to LiteLLM in the expected Ollama format."""
         cfg = LLMConfig(provider="ollama", model="llama3")
         backend = OllamaBackend(cfg)
 

tests/test_llm_base.py

@@ -17,46 +17,58 @@ def complete(self, prompt: str, system: str | None = None) -> str:
 
 
 class TestLLMBackendABC:
+    """Tests for the LLMBackend abstract base class."""
+
     def test_cannot_instantiate_abc_directly(self):
+        """Ensure that LLMBackend cannot be instantiated directly."""
         with pytest.raises(TypeError):
             LLMBackend()  # type: ignore[abstract]
 
     def test_concrete_subclass_is_instantiable(self):
+        """Ensure that a concrete subclass of LLMBackend can be instantiated."""
         backend = ConcreteBackend()
         assert isinstance(backend, LLMBackend)
 
     def test_complete_returns_string(self):
+        """Ensure that the complete method returns a string."""
         backend = ConcreteBackend()
         result = backend.complete("hello")
         assert isinstance(result, str)
 
     def test_complete_accepts_optional_system(self):
+        """Ensure that the complete method accepts an optional system prompt."""
         backend = ConcreteBackend()
         result = backend.complete("hello", system="you are helpful")
         assert isinstance(result, str)
 
 
 class TestFromConfigFactory:
+    """Tests for the from_config factory function."""
+
     def test_returns_anthropic_backend_for_anthropic_provider(self):
+        """Ensure from_config returns an AnthropicBackend for 'anthropic' provider."""
         from foreman.llm.anthropic import AnthropicBackend
 
         cfg = LLMConfig(provider="anthropic", model="claude-sonnet-4-6", api_key="test-key")
         backend = from_config(cfg)
         assert isinstance(backend, AnthropicBackend)
 
     def test_returns_ollama_backend_for_ollama_provider(self):
+        """Ensure from_config returns an OllamaBackend for 'ollama' provider."""
         from foreman.llm.ollama import OllamaBackend
 
         cfg = LLMConfig(provider="ollama", model="llama3")
         backend = from_config(cfg)
         assert isinstance(backend, OllamaBackend)
 
     def test_unknown_provider_raises_value_error(self):
+        """Ensure from_config raises ValueError for an unknown provider."""
         cfg = LLMConfig(provider="unknown-provider", model="some-model")
         with pytest.raises(ValueError, match="unknown-provider"):
             from_config(cfg)
 
     def test_factory_returns_llm_backend_instance(self):
+        """Ensure from_config returns an instance of LLMBackend."""
         cfg = LLMConfig(provider="anthropic", model="claude-sonnet-4-6", api_key="test-key")
         backend = from_config(cfg)
         assert isinstance(backend, LLMBackend)

tests/test_middleware.py

@@ -3,7 +3,6 @@
 from unittest.mock import AsyncMock, patch
 
 import pytest
-import structlog
 
 from foreman.middleware import LogCorrelationIdMiddleware
 

tests/test_otel.py

@@ -1,8 +1,6 @@
-""" "Tests for the foreman.otel module."""
+"""Tests for the foreman.otel module."""
 
-import pytest
 from fastapi import FastAPI
-from opentelemetry import trace
 
 from foreman.otel import configure_otel
 from foreman.settings import AppSettings