feat(projets): racine active par contextvar + projet par session

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/tests/test_projects.py

@@ -0,0 +1,62 @@
+import os
+import tempfile
+
+os.environ.setdefault("DATA_DIR", tempfile.mkdtemp())
+os.environ.setdefault("WORKSPACE_DIR", tempfile.mkdtemp())
+
+import pytest  # noqa: E402
+
+from app import db, tools  # noqa: E402
+from app.config import settings  # noqa: E402
+
+db.init_db()
+_ROOT = os.path.abspath(settings.workspace_dir)
+
+
+@pytest.fixture(autouse=True)
+def _reset_project():
+    tools.set_project(None)
+    yield
+    tools.set_project(None)
+
+
+def test_racine_par_defaut():
+    assert tools.active_root() == _ROOT
+
+
+def test_set_project_reracine():
+    tools.set_project("demo")
+    root = tools.active_root()
+    assert root == os.path.join(_ROOT, "demo")
+    assert os.path.isdir(root)  # créée à la volée
+
+
+def test_confinement_conserve():
+    tools.set_project("demo")
+    with pytest.raises(tools.ToolError):
+        tools._safe_path("../hors-projet")
+
+
+def test_nom_projet_invalide():
+    for bad in ("../x", "UPPER", "a b", "", "x" * 50):
+        with pytest.raises(tools.ToolError):
+            tools.set_project(bad)
+
+
+def test_session_porte_son_projet():
+    s = db.create_session("t", None, project="demo")
+    assert db.get_session(s["id"])["project"] == "demo"
+    db.set_session_project(s["id"], None)
+    assert db.get_session(s["id"])["project"] is None
+
+
+def test_aides_contexte_suivent_le_projet():
+    from app.routes.chat import _mentioned_files, _workspace_listing
+    tools.set_project("ctxdemo")
+    root = tools.active_root()
+    with open(os.path.join(root, "app.py"), "w", encoding="utf-8") as f:
+        f.write("x = 1")
+    assert "app.py" in _workspace_listing()
+    assert _mentioned_files("corrige app.py") == ["app.py"]
+    tools.set_project(None)
+    assert _mentioned_files("corrige app.py") == []  # absent de la racine