Commits on Dec 21, 2021

1. test: Fix stalled tests on Ruby 3.1 …

   Several tests are stalled since Ruby 3.1, I found that it's caused by
   the followig Ruby's change:
   
     ruby/ruby@2d98593
   
   It seems that there are some conditions to reproduce it:
   
     * `attr_reader` is defined in a class
     * `$log` is accessed by it
     * `assert` is called with a block
     * `assert` refers the `$log` via the `attr_reader`
     * ... (some other conditions seem needed but not clarified yet)
   
   Here is the sample test case to reproduce it:
   
   ```ruby
   require 'fluent/test'
   
   class StallTest < Test::Unit::TestCase
     class Stall
       attr_reader :log
       def initialize
         @log = $log
       end
     end
   
     setup do
       Fluent::Test.setup
     end
   
     20.times do |i|
       test "stall #{i}" do
         assert { Stall.new.log }
       end
     end
   end
   ```
   
   Becasue all stalled tests don't need to use block, I remove these blocks
   to avoid this issue.
   
   Fix #3543
   
   Signed-off-by: Takuro Ashie <ashie@clear-code.com>

   

   ashie committed Dec 21, 2021
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