chore: import upstream snapshot with attribution

tests/test_python_import_resolution.py

@@ -0,0 +1,86 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from graphify.extract import extract
+
+
+def _write(path: Path, text: str) -> Path:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    path.write_text(text, encoding="utf-8")
+    return path
+
+
+def _node_id(result: dict, label: str, source_file: str) -> str:
+    matches = [
+        node["id"]
+        for node in result["nodes"]
+        if node.get("label") == label and node.get("source_file") == source_file
+    ]
+    assert len(matches) == 1
+    return matches[0]
+
+
+def _has_edge(result: dict, source: str, target: str, relation: str) -> bool:
+    return any(
+        edge["source"] == source
+        and edge["target"] == target
+        and edge["relation"] == relation
+        for edge in result["edges"]
+    )
+
+
+def test_python_package_reexport_resolves_import_and_call_to_origin_symbol(tmp_path: Path):
+    origin = _write(tmp_path / "pkg/foo.py", "def Foo():\n    return 1\n")
+    barrel = _write(tmp_path / "pkg/__init__.py", "from .foo import Foo as PublicFoo\n")
+    consumer = _write(
+        tmp_path / "app.py",
+        "from pkg import PublicFoo\n\n"
+        "def X():\n"
+        "    return PublicFoo()\n",
+    )
+
+    result = extract([origin, barrel, consumer], cache_root=tmp_path)
+
+    origin_file = _node_id(result, "foo.py", "pkg/foo.py")
+    barrel_file = _node_id(result, "__init__.py", "pkg/__init__.py")
+    consumer_file = _node_id(result, "app.py", "app.py")
+    origin_symbol = _node_id(result, "Foo()", "pkg/foo.py")
+    consumer_symbol = _node_id(result, "X()", "app.py")
+
+    assert _has_edge(result, barrel_file, origin_file, "re_exports")
+    assert _has_edge(result, consumer_file, origin_symbol, "imports")
+    assert _has_edge(result, consumer_symbol, origin_symbol, "calls")
+
+
+def test_python_parameter_return_and_generic_contexts(tmp_path: Path):
+    model = tmp_path / "pkg" / "model.py"
+    model.parent.mkdir(parents=True)
+    model.write_text(
+        "class Payload:\n"
+        "    pass\n\n"
+        "class Result:\n"
+        "    pass\n",
+        encoding="utf-8",
+    )
+    service = tmp_path / "pkg" / "service.py"
+    service.write_text(
+        "from .model import Payload, Result\n\n"
+        "def process(item: Payload) -> Result:\n"
+        "    return Result()\n\n"
+        "def process_many(items: list[Payload]) -> Result:\n"
+        "    return Result()\n",
+        encoding="utf-8",
+    )
+
+    result = extract([model, service], cache_root=tmp_path)
+    labels = {node["id"]: node["label"] for node in result["nodes"]}
+    edges = [edge for edge in result["edges"] if edge.get("relation") == "references"]
+    pairs = {
+        (labels.get(e["source"], e["source"]), labels.get(e["target"], e["target"]), e.get("context"))
+        for e in edges
+    }
+
+    assert ("process()", "Payload", "parameter_type") in pairs
+    assert ("process()", "Result", "return_type") in pairs
+    assert ("process_many()", "Payload", "generic_arg") in pairs