Rake::TestTask raises an error when the test path includes non-ascii characters

The error

When a test file path includes some non-ascii characters, rake test task Rake::TestTask fails with a message

File does not exist: [test_target_file_name]

It seems the task can't find a file on non-ascii path.

Environment

• Windows 10 Pro
• ruby 2.6.5p114 (2019-10-01 revision 67812) [x64-mingw32]
• rake 13.0.1

How to reproduce

1. clone this repo.
2. open a command prompt. move to this directory.
3. type the commands below.

> cd あいうえお
> bundle exec rake

(samle folder structure)

  あいうえお
  │  Gemfile
  │  Gemfile.lock
  │  Rakefile
  │  
  ├─lib
  │      target.rb
  │      
  └─test
          target_test.rb

Details

bundle exec rake

C:/Ruby26-x64/bin/ruby.exe -w -I"lib;lib;test" -I"C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib" "C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/rake_test_loader.rb" "test/target_test.rb"
File does not exist: target
rake aborted!
Command failed with status (1): [ruby -w -I"lib;lib;test" -I"C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib" "C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/rake_test_loader.rb" "test/target_test.rb" ]
Tasks: TOP => default => tsk
(See full trace by running task with --trace)

bundle exec rake --trace

** Invoke default (first_time)
** Invoke tsk (first_time)
** Execute tsk
C:/Ruby26-x64/bin/ruby.exe -w -I"lib;lib;test" -I"C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib" "C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/rake_test_loader.rb" "test/target_test.rb"
File does not exist: target
rake aborted!
Command failed with status (1): [ruby -w -I"lib;lib;test" -I"C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib" "C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/rake_test_loader.rb" "test/target_test.rb" ]
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/testtask.rb:130:in block (3 levels) in define' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/file_utils.rb:57:in sh'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/file_utils.rb:104:in ruby' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/testtask.rb:117:in block (2 levels) in define'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/file_utils_ext.rb:58:in verbose' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/testtask.rb:111:in block in define'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/task.rb:281:in block in execute' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/task.rb:281:in each'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/task.rb:281:in execute' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/task.rb:219:in block in invoke_with_call_chain'
C:/Ruby26-x64/lib/ruby/2.6.0/monitor.rb:235:in mon_synchronize' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/task.rb:199:in invoke_with_call_chain'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/task.rb:243:in block in invoke_prerequisites' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/task.rb:241:in each'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/task.rb:241:in invoke_prerequisites' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/task.rb:218:in block in invoke_with_call_chain'
C:/Ruby26-x64/lib/ruby/2.6.0/monitor.rb:235:in mon_synchronize' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/task.rb:199:in invoke_with_call_chain'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/task.rb:188:in invoke' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:160:in invoke_task'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:116:in block (2 levels) in top_level' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:116:in each'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:116:in block in top_level' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:125:in run_with_threads'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:110:in top_level' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:83:in block in run'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:186:in standard_exception_handling' C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/application.rb:80:in run'
C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/exe/rake:27:in <top (required)>' C:/Ruby26-x64/bin/rake:23:in load'
C:/Ruby26-x64/bin/rake:23:in `
'
Tasks: TOP => default => tsk

(ok case) ascii charator only path

C:\rake_test_task_non_ascii_path\abcde>bundle exec rake
C:/Ruby26-x64/bin/ruby.exe -w -I"lib;lib;test" -I"C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib" "C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/rake_test_loader.rb" "test/target_test.rb"
Loaded suite C:/Ruby26-x64/lib/ruby/gems/2.6.0/gems/rake-13.0.1/lib/rake/rake_test_loader
Started
.
Finished in 0.000892 seconds.
----------------------------------------------------------------------------------------------------------------------------------------------------------------
1 tests, 1 assertions, 0 failures, 0 errors, 0 pendings, 0 omissions, 0 notifications
100% passed
----------------------------------------------------------------------------------------------------------------------------------------------------------------
1121.08 tests/s, 1121.08 assertions/s