test(litigation): cover provider factory selection and OpenRouter config

tests/test_litigation_providers.py

@@ -0,0 +1,62 @@
+"""Regression tests for litigation provider factory selection and OpenRouter config."""
+
+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:
+    p = get_provider("ollama", "llama3.2", ollama_base_url="http://host:11434")
+    assert isinstance(p, OllamaProvider)
+    assert p.model == "llama3.2"
+    assert p.base_url == "http://host:11434"
+
+
+def test_get_provider_lm_studio() -> None:
+    p = get_provider("lm_studio", "local-model", lm_studio_base_url="http://127.0.0.1:1234/v1")
+    assert isinstance(p, OpenAICompatProvider)
+    assert p.model == "local-model"
+    assert p.base_url == "http://127.0.0.1:1234/v1"
+    assert p.api_key == "lm-studio"
+
+
+def test_get_provider_openrouter_with_key(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.delenv("OPENROUTER_API_KEY", raising=False)
+    cfg = {
+        "app_attribution": {"http_referer": "https://example.com", "x_title": "TestApp"},
+        "provider": {"sort": "price"},
+        "user": "user-42",
+    }
+    p = get_provider(
+        "openrouter",
+        "anthropic/claude-3.5-sonnet",
+        openrouter_api_key="sk-test",
+        openrouter_config=cfg,
+    )
+    assert isinstance(p, OpenAICompatProvider)
+    assert p.api_key == "sk-test"
+    assert p.base_url == "https://openrouter.ai/api/v1"
+    assert p.default_headers == {"HTTP-Referer": "https://example.com", "X-Title": "TestApp"}
+    assert p.extra_body == {"provider": {"sort": "price"}, "user": "user-42"}
+
+
+def test_get_provider_openrouter_uses_env_key(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv("OPENROUTER_API_KEY", "env-key")
+    p = get_provider("openrouter", "openai/gpt-4o-mini")
+    assert isinstance(p, OpenAICompatProvider)
+    assert p.api_key == "env-key"
+
+
+def test_get_provider_openrouter_missing_key_raises(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.delenv("OPENROUTER_API_KEY", raising=False)
+    with pytest.raises(ValueError, match="OPENROUTER_API_KEY"):
+        get_provider("openrouter", "openai/gpt-4o-mini")
+
+
+def test_get_provider_unknown_raises() -> None:
+    with pytest.raises(ValueError, match="Unknown provider"):
+        get_provider("anthropic_direct", "claude-3")