test: read the WebRTC transport's source as a set of files

Source-reading tests take their text from node_source (node) and node_tree
(hub): webrtc_server.py plus anything under transport/webrtc/, so a check
for something's absence keeps reading the code it guards if that code moves.
test_node_source_scope holds the boundary.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 2 insertions, 5 deletions

diff --git a/packages/meshbay-node/tests/test_app_directories.py b/packages/meshbay-node/tests/test_app_directories.py
index 955a769..1b8d1e0 100644
--- a/packages/meshbay-node/tests/test_app_directories.py
+++ b/packages/meshbay-node/tests/test_app_directories.py
@@ -32,6 +32,7 @@ from meshbay_node.indexer.group_index import GroupIndex
 from meshbay_node.roots import RootSet
 from meshbay_node.roster import Roster
 from meshbay_node.transport.webrtc_server import WebRTCPeerSession
+from node_source import session_method
 
 from conftest import one_root
 
@@ -423,11 +424,7 @@ async def test_the_ack_has_no_list_of_applications_of_its_own():
     """
     from meshbay_node.daemon import NodeDaemon
 
-    source = Path(WebRTCPeerSession.__module__.replace(".", "/"))
-    text = (Path(__file__).resolve().parents[2] / "meshbay-node" / "src"
-            / f"{source}.py").read_text(encoding="utf-8")
-    body = text[text.index("def _app_directories_ack"):]
-    body = body[:body.index("\n    def ", 1)]
+    body = session_method("_app_directories_ack")
     for app in NodeDaemon.APP_DIR_KEYS:
         assert app not in body, (
             f"the ack names {app!r}; it must read the context's own keys")