test: cover litigation provider factory selection and OpenRouter config

tests/test_litigation_providers.py

@@ -0,0 +1,69 @@
+"""Litigation LLM provider factory selection and OpenRouter configuration."""
+
+from __future__ import annotations
+
+import pytest
+
+from litigation.providers.factory import get_provider
+from litigation.providers.ollama_provider import OllamaProvider
+from litigation.providers.openai_compat_provider import OpenAICompatProvider
+
+
+def test_get_provider_ollama() -> None:
+    provider = get_provider("ollama", "llama3.2", ollama_base_url="http://127.0.0.1:11434")
+    assert isinstance(provider, OllamaProvider)
+    assert provider.model == "llama3.2"
+    assert provider.base_url == "http://127.0.0.1:11434"
+
+
+def test_get_provider_lm_studio() -> None:
+    provider = get_provider("lm_studio", "local-model", lm_studio_base_url="http://localhost:1234/v1")
+    assert isinstance(provider, OpenAICompatProvider)
+    assert provider.model == "local-model"
+    assert provider.base_url == "http://localhost:1234/v1"
+    assert provider.api_key == "lm-studio"
+
+
+def test_get_provider_openrouter_requires_api_key(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.delenv("OPENROUTER_API_KEY", raising=False)
+    with pytest.raises(ValueError, match="OPENROUTER_API_KEY"):
+        get_provider("openrouter", "anthropic/claude-3.5-sonnet")
+
+
+def test_get_provider_openrouter_from_env(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv("OPENROUTER_API_KEY", "sk-or-test")
+    provider = get_provider("openrouter", "openai/gpt-4o-mini")
+    assert isinstance(provider, OpenAICompatProvider)
+    assert provider.api_key == "sk-or-test"
+    assert provider.base_url == "https://openrouter.ai/api/v1"
+
+
+def test_get_provider_openrouter_explicit_key_and_config() -> None:
+    provider = get_provider(
+        "openrouter",
+        "anthropic/claude-3.5-sonnet",
+        openrouter_api_key="sk-explicit",
+        openrouter_config={
+            "app_attribution": {
+                "http_referer": "https://example.com/app",
+                "x_title": "Litigation Runner",
+            },
+            "provider": {"sort": "price", "allow_fallbacks": True},
+            "user": "court-session-1",
+        },
+    )
+    assert provider.api_key == "sk-explicit"
+    assert provider.default_headers["HTTP-Referer"] == "https://example.com/app"
+    assert provider.default_headers["X-Title"] == "Litigation Runner"
+    assert provider.extra_body["provider"] == {"sort": "price", "allow_fallbacks": True}
+    assert provider.extra_body["user"] == "court-session-1"
+
+
+def test_get_provider_normalizes_name() -> None:
+    provider = get_provider("  OLLAMA  ", "mistral")
+    assert isinstance(provider, OllamaProvider)
+
+
+def test_get_provider_unknown_raises() -> None:
+    with pytest.raises(ValueError, match="Unknown provider"):
+        get_provider("azure", "gpt-4")