chore: import upstream snapshot with attribution

tests/test_openai_custom_endpoint.py

@@ -0,0 +1,46 @@
+"""Tests for OPENAI_BASE_URL / OPENAI_MODEL overrides on the openai backend.
+
+These env vars point `--backend openai` at any OpenAI-compatible server
+(llama.cpp, vLLM, LM Studio, ...) without a providers.json entry.
+"""
+
+import importlib
+
+from graphify import llm
+
+
+def test_openai_defaults_without_env(monkeypatch):
+    monkeypatch.delenv("OPENAI_BASE_URL", raising=False)
+    monkeypatch.delenv("OPENAI_MODEL", raising=False)
+    reloaded = importlib.reload(llm)
+    try:
+        assert reloaded.BACKENDS["openai"]["base_url"] == "https://api.openai.com/v1"
+        assert reloaded.BACKENDS["openai"]["default_model"] == "gpt-4.1-mini"
+    finally:
+        monkeypatch.undo()
+        importlib.reload(llm)
+
+
+def test_openai_base_url_and_model_env_override(monkeypatch):
+    monkeypatch.setenv("OPENAI_BASE_URL", "http://localhost:8080/v1")
+    monkeypatch.setenv("OPENAI_MODEL", "my-local-model")
+    reloaded = importlib.reload(llm)
+    try:
+        assert reloaded.BACKENDS["openai"]["base_url"] == "http://localhost:8080/v1"
+        assert reloaded.BACKENDS["openai"]["default_model"] == "my-local-model"
+    finally:
+        monkeypatch.undo()
+        importlib.reload(llm)
+
+
+def test_graphify_openai_model_wins_over_openai_model(monkeypatch):
+    # model_env_key (GRAPHIFY_OPENAI_MODEL) is resolved at call time and takes
+    # precedence over the import-time OPENAI_MODEL default.
+    monkeypatch.setenv("OPENAI_MODEL", "env-default-model")
+    monkeypatch.setenv("GRAPHIFY_OPENAI_MODEL", "graphify-override-model")
+    reloaded = importlib.reload(llm)
+    try:
+        assert reloaded._default_model_for_backend("openai") == "graphify-override-model"
+    finally:
+        monkeypatch.undo()
+        importlib.reload(llm)