Commits on Jun 15, 2022

1. test_child_process: Try to fix unstable tests …

   On CI environment, these tests sometimes observe unexepected 3rd command
   invocation due to delayed shutdown:
   
   ```
   2022-06-13T23:57:56.4703110Z Failure: test: can execute external command many times, with leading once executed immediately(ChildProcessTest)
   2022-06-13T23:57:56.4704700Z /Users/runner/work/fluentd/fluentd/test/plugin_helper/test_child_process.rb:345:in `block (2 levels) in <class:ChildProcessTest>'
   2022-06-13T23:57:56.4705540Z      342:       end
   2022-06-13T23:57:56.4706110Z      343:       sleep 1.9 # 1sec(second invocation) + 0.9sec
   2022-06-13T23:57:56.4706880Z      344:       @d.stop; @d.shutdown; @d.close; @d.terminate
   2022-06-13T23:57:56.4707620Z   => 345:       assert_equal 2, ary.size
   2022-06-13T23:57:56.4708220Z      346:       assert_equal [], @d.log.out.logs
   2022-06-13T23:57:56.4708800Z      347:     end
   2022-06-13T23:57:56.4709330Z      348:   end
   2022-06-13T23:57:56.4709970Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/timeout.rb:95:in `block in timeout'
   2022-06-13T23:57:56.4710800Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/timeout.rb:33:in `block in catch'
   2022-06-13T23:57:56.4711540Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/timeout.rb:33:in `catch'
   2022-06-13T23:57:56.4712240Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/timeout.rb:33:in `catch'
   2022-06-13T23:57:56.4712940Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/timeout.rb:110:in `timeout'
   2022-06-13T23:57:56.4713660Z /Users/runner/work/fluentd/fluentd/test/plugin_helper/test_child_process.rb:339:in `block in <class:ChildProcessTest>'
   2022-06-13T23:57:56.4714530Z <2> expected but was
   2022-06-13T23:57:56.4715340Z <3>
   ```
   
   To avoid it, check only 1st & 2nd elapsed time.
   
   Signed-off-by: Takuro Ashie <ashie@clear-code.com>

   

   ashie committed Jun 15, 2022
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