On OS X + homebrew: I see a failure that I don't remember seeing before:
src/bin/sage -t --long --warn-long 30.0 --random-seed=282567954046322675542588041943476387751 src/sage_docbuild/builders.py
**********************************************************************
File "src/sage_docbuild/builders.py", line 1850, in sage_docbuild.builders._extend_over_namespace_packages
Failed example:
answer[0] == root, answer[1]
Expected:
(True, ['mod', 'inner', 'ns_2718'])
Got:
(False, ['mod', 'inner', 'ns_2718'])
**********************************************************************
1 item had failures:
1 of 6 in sage_docbuild.builders._extend_over_namespace_packages
[136 tests, 1 failure, 0.26s wall]
There is also a failure in `src/sage/env.py`, but that's been around for a while.