Fix test-all tests to avoid creating report_on_exception warnings

* The warnings are shown by Thread.report_on_exception defaulting to
  true. [Feature #14143] [ruby-core:83979]
* Improves tests by narrowing down the scope where an exception
  is expected.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61188 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 2 deletions

diff --git a/test/thread/test_sync.rb b/test/thread/test_sync.rb
index e576fc1d32..8241445faf 100644
--- a/test/thread/test_sync.rb
+++ b/test/thread/test_sync.rb
@@ -52,11 +52,15 @@ class SyncTest < Test::Unit::TestCase
     tester= Tester.new
     tester.sync_lock(:EX)
 
-    t = Thread.new { tester.sync_lock(:EX) }
+    t = Thread.new {
+      assert_raise(RuntimeError) {
+        tester.sync_lock(:EX)
+      }
+    }
 
     sleep 0.1 until t.stop?
     t.raise
-    sleep 0.1 while t.alive?
+    t.join
 
     assert_equal(tester.sync_waiting.uniq, tester.sync_waiting)
     assert_equal(tester.sync_waiting, [])