test_in_tail: Show more information of test_unwatched_files_should_be_removed

[ashie]

It's unstable on macOS but hard to debug due to less information:

https://github.com/fluent/fluentd/runs/6872721774?check_suite_focus=true

2022-06-14T02:25:40.1951760Z Failure: test_unwatched_files_should_be_removed(TailInputTest::path)
2022-06-14T02:25:40.1968250Z /Users/runner/work/fluentd/fluentd/test/plugin/test_in_tail.rb:1615:in `test_unwatched_files_should_be_removed'
2022-06-14T02:25:40.1968820Z      1612:       waiting(20) { sleep 0.1 until Dir.glob("#{@tmp_dir}/*.txt").size == 0 } # Ensure file is deleted on Windows
2022-06-14T02:25:40.1969220Z      1613:       waiting(5) { sleep 0.1 until d.instance.instance_variable_get(:@tails).keys.size <= 0 }
2022-06-14T02:25:40.1969500Z      1614:
2022-06-14T02:25:40.1969770Z   => 1615:       assert_equal(0, d.instance.instance_variable_get(:@tails).keys.size)
2022-06-14T02:25:40.1970010Z      1616:
2022-06-14T02:25:40.1970200Z      1617:       d.instance_shutdown
2022-06-14T02:25:40.1970500Z      1618:     end
2022-06-14T02:25:40.1970720Z <0> expected but was
2022-06-14T02:25:40.1970910Z <1>

Signed-off-by: Takuro Ashie [email protected]

Which issue(s) this PR fixes:
Fixes #

What this PR does / why we need it:

Docs Changes:

Release Note:

[ashie]

Hmm, can't reproduce on CI in this pull request.
I merge this into master for further investigation.

[ashie]

https://github.com/fluent/fluentd/runs/6875305374?check_suite_focus=true

2022-06-14T07:17:55.0456030Z Error: test_unwatched_files_should_be_removed(TailInputTest::path): SystemStackError: stack level too deep
2022-06-14T07:17:55.2289960Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:179:in `bind_call'
2022-06-14T07:17:55.2290470Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:179:in `object_address_group'
2022-06-14T07:17:55.2291380Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:241:in `pp_object'
2022-06-14T07:17:55.2292100Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:303:in `pretty_print'
2022-06-14T07:17:55.2292770Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:163:in `block in pp'
2022-06-14T07:17:55.2293490Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:253:in `block (2 levels) in group'
2022-06-14T07:17:55.2294200Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:280:in `nest'
2022-06-14T07:17:55.2294640Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:252:in `block in group'
2022-06-14T07:17:55.2294990Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:265:in `group_sub'
2022-06-14T07:17:55.2296120Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:251:in `group'
2022-06-14T07:17:55.2296450Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:163:in `pp'
2022-06-14T07:17:55.2296800Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:249:in `block (3 levels) in pp_object'
2022-06-14T07:17:55.2297180Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:253:in `block (2 levels) in group'
2022-06-14T07:17:55.2297540Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:280:in `nest'
2022-06-14T07:17:55.2297890Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:252:in `block in group'
2022-06-14T07:17:55.2298250Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:265:in `group_sub'
2022-06-14T07:17:55.2298590Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:251:in `group'
2022-06-14T07:17:55.2298980Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:247:in `block (2 levels) in pp_object'
2022-06-14T07:17:55.2299330Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:234:in `block in seplist'
...
2022-06-14T07:17:55.5053730Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:280:in `nest'
2022-06-14T07:17:55.5053890Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:252:in `block in group'
2022-06-14T07:17:55.5054060Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:265:in `group_sub'
2022-06-14T07:17:55.5054210Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/prettyprint.rb:251:in `group'
2022-06-14T07:17:55.5054350Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:163:in `pp'
2022-06-14T07:17:55.5054500Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:73:in `block in pp'
2022-06-14T07:17:55.5054660Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:120:in `guard_inspect_key'
2022-06-14T07:17:55.5054950Z /Users/runner/hostedtoolcache/Ruby/2.7.6/x64/lib/ruby/2.7.0/pp.rb:73:in `pp'
2022-06-14T07:17:55.5055170Z /Users/runner/work/fluentd/fluentd/test/plugin/test_in_tail.rb:1615:in `test_unwatched_files_should_be_removed'
2022-06-14T07:17:55.5055350Z      1612:       waiting(20) { sleep 0.1 until Dir.glob("#{@tmp_dir}/*.txt").size == 0 } # Ensure file is deleted on Windows
2022-06-14T07:17:55.5055520Z      1613:       waiting(5) { sleep 0.1 until d.instance.instance_variable_get(:@tails).keys.size <= 0 }
2022-06-14T07:17:55.5055590Z      1614: 
2022-06-14T07:17:55.5055670Z   => 1615:       assert_equal(
2022-06-14T07:17:55.5055730Z      1616:         {
2022-06-14T07:17:55.5055810Z      1617:           files: [],
2022-06-14T07:17:55.5055880Z      1618:           tails: {}

🤔