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rails--rails/activesupport/test/core_ext/object
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yuuji.yaginuma 1b86d90136 Enable Performance/UnfreezeString cop 
In Ruby 2.3 or later, `String#+@` is available and `+@` is faster than `dup`.

```ruby
# frozen_string_literal: true

require "bundler/inline"

gemfile(true) do
  source "https://rubygems.org"

  gem "benchmark-ips"
end

Benchmark.ips do |x|
  x.report('+@') { +"" }
  x.report('dup') { "".dup }
  x.compare!
end
```

```
$ ruby -v benchmark.rb
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
Warming up --------------------------------------
                  +@   282.289k i/100ms
                 dup   187.638k i/100ms
Calculating -------------------------------------
                  +@      6.775M (± 3.6%) i/s -     33.875M in   5.006253s
                 dup      3.320M (± 2.2%) i/s -     16.700M in   5.032125s

Comparison:
                  +@:  6775299.3 i/s
                 dup:  3320400.7 i/s - 2.04x  slower

```
2018-09-23 08:56:55 +09:00
..
acts_like_test.rb Replace assert ! with assert_not 2018-04-19 08:11:33 -04:00
blank_test.rb Merge pull request #31648 from dixitp012/rubocop_active_support_test 2018-01-08 15:14:14 +09:00
deep_dup_test.rb Replace assert ! with assert_not 2018-04-19 08:11:33 -04:00
duplicable_test.rb Fix CustomCops/AssertNot to allow it to have failure message 2018-05-13 11:32:47 +09:00
inclusion_test.rb Replace assert ! with assert_not 2018-04-19 08:11:33 -04:00
instance_variables_test.rb Enable Performance/UnfreezeString cop 2018-09-23 08:56:55 +09:00
json_cherry_pick_test.rb [Active Support] rubocop -a --only Layout/EmptyLineAfterMagicComment 2017-07-11 13:12:32 +09:00
json_gem_encoding_test.rb [Active Support] rubocop -a --only Layout/EmptyLineAfterMagicComment 2017-07-11 13:12:32 +09:00
to_param_test.rb [Active Support] rubocop -a --only Layout/EmptyLineAfterMagicComment 2017-07-11 13:12:32 +09:00
to_query_test.rb Fix obsoleted method URI.unescape in activesupport/test 2018-08-15 18:00:45 -03:00
try_test.rb Use try in tests that try to test try. 2018-03-21 21:02:36 +01:00