Clarify fontTools lazy processing comment in test
@@ -28,7 +28,9 @@ def test_check_069():
status, _ = list(check(test_font))[-1]
assert status == PASS
- # Always start with a fresh copy, as fT works lazily.
+ # Always start with a fresh copy, as fT works lazily. Accessing certain data
+ # can prevent the test from working because we rely on uninitialized
+ # behavior.
test_font = TTFont(test_font_path)
test_font["loca"].locations.pop()
test_file = io.BytesIO()
