test_poll: workaround for timing-sensitive test on slow hosts

poll(2) may return successfully before it gets interrupted
by the signal.

Found and fix confirmed by 375gnu on the kgio mailing list.

ref: <CAAB-Kcm=_CRa4UoSQt+C4cHk6z2Rpfsv6_KXPHV3R34Gt6sLiQ@mail.gmail.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/test/test_poll.rb b/test/test_poll.rb
index ba0e561..df59354 100644
--- a/test/test_poll.rb
+++ b/test/test_poll.rb
@@ -58,7 +58,10 @@ class TestPoll < Test::Unit::TestCase
     res = nil
     thr = Thread.new { sleep 0.100; Process.kill(:USR1, $$) }
     t0 = Time.now
-    assert_raises(IOError) { Kgio.poll({@rd => Kgio::POLLIN}) }
+    assert_raises(IOError) do
+      result = Kgio.poll({@rd => Kgio::POLLIN})
+      result.each_key { |io| io.read_nonblock(1) }
+    end
     diff = Time.now - t0
     thr.join
     assert diff >= 0.010, "diff=#{diff}"