test/test_rack_hijack.rb: try to increase test reliability

We need to wait for the hijacked process to run and write to the
log before we check it.  Since we may not have inotify, try to
trigger a sched_yield() syscall instead.

1 files changed, 4 insertions, 0 deletions

diff --git a/test/test_rack_hijack.rb b/test/test_rack_hijack.rb
index 5bfc31f..2a9f23e 100644
--- a/test/test_rack_hijack.rb
+++ b/test/test_rack_hijack.rb
@@ -62,6 +62,10 @@ class TestRackHijack < Testcase
     assert_equal "zzz", res["X-Test"]
     assert_equal "1.1", res.http_version
 
+    # hope this calls sched_yield() so the forked process runs and writes
+    # to the log.
+    Thread.new { Thread.pass }.join
+
     errs = File.readlines(err.path).grep(/DieIfUsed/)
     assert_equal([ "INFO #{pid} closed DieIfUsed 1\n",
                    "INFO #{pid} closed DieIfUsed 2\n" ], errs)