test_benchmark.rb: extend sleep time

* test/benchmark/test_benchmark.rb: extend sleep time, as 1ms is
  too short on some environments.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47321 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/benchmark/test_benchmark.rb

@@ -154,7 +154,8 @@ BENCH
   end
 
   def test_realtime_output
-    realtime = Benchmark.realtime { sleep 0.001 }
-    assert_in_delta 0.001, realtime
+    sleeptime = 1.0
+    realtime = Benchmark.realtime { sleep sleeptime }
+    assert_in_delta sleeptime, realtime
   end
 end