Ruby can delay arbitrarily because Ruby is not a realtime system,

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47360 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/benchmark/test_benchmark.rb

@@ -156,6 +156,6 @@ BENCH
   def test_realtime_output
     sleeptime = 1.0
     realtime = Benchmark.realtime { sleep sleeptime }
-    assert_in_epsilon sleeptime, realtime
+    assert_operator sleeptime, :<, realtime
   end
 end