On line 165, subprocess_init_span.get("attributes", {}) == data compares against data = ApproxDict({}). Per ApproxDict's __eq__ (tests/conftest.py), an empty ApproxDict matches any dict because the all(...) over zero items is trivially True. As a result, this assertion validates nothing about the init span's attributes and silently passes regardless of what attributes are present (or absent). The test loses coverage of the init span's expected attribute payload in the streaming path.