deps: update minitest requirement from ~> 5.10, != 5.10.2 to != 5.10.2, ~> 6.0 in the development-dependencies group

[dependabot]

Updates the requirements on minitest to permit the latest version.
Updates minitest to 6.0.1

Changelog

Sourced from minitest's changelog.

=== 6.0.1 / 2025-12-26

• 1 minor enhancement:

  • Added new rake task test:fu to Minitest::TestTask, to only run tests with FU (focused units?) in their name. This should mostly obviate the need for the minitest-focus plugin.

• 5 bug fixes:

  • Fixed --help and --version exiting 1. (grosser)
  • Fixed method signature of Minitest::Benchmark.run. (flavorjones)
  • Flush stdout/stderr before exit./bin/minitest -Ilib ./bug1046.rb:1 < /dev/null (grosser)
  • Improved usage banner output by reordering and reformatting.
  • Normalize paths while processing file.rb:line args.

=== 6.0.0 / 2025-12-17

This is a major release. Read this.

Please give feedback here: minitest/minitest#1040

Oh god... here we go... (again)

• 8 deaths in the family(!!):

  • Deleted MiniTest and MiniTest::Unit::TestCase compatibility namespaces.
  • Deleted all use of Marshal for serialization.
  • Deleted maglev? and rubinius? guard methods. LOL.
  • Deleted all minitest/spec expectations from Object. Use _/value/expect.
  • Dropped minitest/mock.rb. This has been extracted to the minitest-mock gem.
  • assert_equal(nil, value) no longer allowed. Use assert_nil to be explicit.
  • Removed assert_send. Use assert_predicate or assert_operator.
  • Removed Minitest::Test#class_name.

• 7 major (oft incompatible) changes:

  • Big: Major refactored MT6's run path!
    • Minitest.__run -> Minitest.run_all_suites
    • Runnable.run -> Runnable.run_suite & Runnable.filter_runnable_methods
    • Runnable.run_one_method -> Runnable.run
    • Removed Minitest.run_one_method (might bring it back to raise?)
  • Removed deprecated ENV["N"] to specify number of parallel tests. Use MT_CPU.
  • Renamed +options[:filter]+ to +options[:include]+, added --include cmdline option.
    • --name is still handled, but that will be removed in the future.
  • Renamed Minitest::Runnable#test_order to #run_order.
  • If #message is passed a proc then that proc overrides all other output.
    • They are no longer chained!
    • And it does less for formatting of your output.
  • Removed reporter arg from with_info_handler as it has never(?) been used. (HACK?)

... (truncated)

Commits

• edd37ce prepped for release
• 248c9e2 - Fixed method signature of Minitest::Benchmark.run. (flavorjones)
• 18bbdb1 - Flush stdout/stderr before exit./bin/minitest -Ilib ./bug1046.rb:1 < /dev/n...
• 50a1b1f - Normalize paths while processing file.rb:line args.
• 372b997 - Fixed --help and --version exiting 1. (grosser)
• c05a898 - Improved usage banner output by reordering and reformatting.
• 692c2e7 + Added new rake task test:fu to Minitest::TestTask, to only run tests with...
• 5bbab5c Fix format of History.rdoc. (y-yagi)
• 2f3d88e prepped for release
• 756f965 Add Hoe's :cov plugin and start to look at gaps
• Additional commits viewable in compare view

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[takaokouji]

Changes Applied

I've updated this PR to make it compatible with all supported Rails versions. The original PR attempted to upgrade to minitest ~> 6.0, but this caused dependency conflicts with older Rails versions.

What was the problem?

Rails versions 5.1, 5.2, and 6.0 have activesupport gems that require minitest ~> 5.1, which explicitly excludes minitest 6.0. This caused all 60 CI jobs to fail with bundler dependency resolution errors.

How was it fixed?

1. Changed minitest constraint to be permissive: '>= 5.10', '!= 5.10.2', '< 7'

   • This allows bundler to select minitest 5.x for Rails < 6.1 (which require ~> 5.1)
   • And minitest 6.x for Rails >= 6.1 (which require >= 5.1)

2. Added minitest-mock gem dependency

   • Required for minitest 6.0, which extracted minitest/mock to a separate gem
   • The codebase uses Minitest::Mock in test files

3. Removed Minitest 4 backward compatibility code

   • The MiniTest:: namespace compatibility is no longer needed
   • This namespace was removed in minitest 6.0 anyway

Testing

✅ Tested locally with Rails 6.1.7.10 + minitest 6.0.1: All 704 tests pass
✅ Tested locally with Rails 7.0.10 + minitest 6.0.1: All tests pass

This approach maintains compatibility with all supported Rails versions while allowing the project to use the latest minitest 6.0 features when possible.