Spurious test failure: net::tcp::tests::connect_timeout_unroutable

[tmerr]

What I tried: ./x.py test src/libstd on a laptop disconnected from wifi, running linux
What I expected: tests pass
What I got: tests pass except net::tcp::tets::connect_timeout_unroutable.

thread '<unnamed>' panicked at 'assertion failed: `(left == right)`
  left: `Other`,
 right: `TimedOut`', src/libstd/net/tcp.rs:test 1576:8

Underlying error: Error { repr: Os { code: 101, message: "Network is unreachable" } }.

Should the test suite be assuming we are on some network?