Rails5 + Minitest won't work

[krtschmr]

rake aborted!
TypeError: superclass mismatch for class Test
/home/tim/.rvm/gems/ruby-2.3.0/gems/minitest-5.10.1/lib/minitest/test.rb:10:in <module:Minitest>' /home/tim/.rvm/gems/ruby-2.3.0/gems/minitest-5.10.1/lib/minitest/test.rb:3:in <top (required)>'
/home/tim/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in require' /home/tim/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in block in require'
/home/tim/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in load_dependency' /home/tim/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in require'
/home/tim/.rvm/gems/ruby-2.3.0/gems/minitest-5.10.1/lib/minitest.rb:842:in <top (required)>' /home/tim/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in require'
/home/tim/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in block in require' /home/tim/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in load_dependency'
/home/tim/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in require' /home/tim/.rvm/gems/ruby-2.3.0/gems/railties-5.0.1/lib/rails/test_unit/testing.rake:2:in <top (required)>'
/home/tim/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in load' /home/tim/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in block in load'
/home/tim/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in load_dependency' /home/tim/.rvm/gems/ruby-2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:287:in load'
/home/tim/.rvm/gems/ruby-2.3.0/gems/railties-5.0.1/lib/rails/test_unit/railtie.rb:23:in block in <class:TestUnitRailtie>' /home/tim/.rvm/gems/ruby-2.3.0/gems/railties-5.0.1/lib/rails/railtie.rb:239:in instance_exec'
/home/tim/.rvm/gems/ruby-2.3.0/gems/railties-5.0.1/lib/rails/railtie.rb:239:in block in run_tasks_blocks' /home/tim/.rvm/gems/ruby-2.3.0/gems/railties-5.0.1/lib/rails/railtie.rb:247:in each'
/home/tim/.rvm/gems/ruby-2.3.0/gems/railties-5.0.1/lib/rails/railtie.rb:247:in each_registered_block' /home/tim/.rvm/gems/ruby-2.3.0/gems/railties-5.0.1/lib/rails/railtie.rb:239:in run_tasks_blocks'
/home/tim/.rvm/gems/ruby-2.3.0/gems/railties-5.0.1/lib/rails/application.rb:442:in block in run_tasks_blocks' /home/tim/.rvm/gems/ruby-2.3.0/gems/railties-5.0.1/lib/rails/engine/railties.rb:13:in each'
/home/tim/.rvm/gems/ruby-2.3.0/gems/railties-5.0.1/lib/rails/engine/railties.rb:13:in each' /home/tim/.rvm/gems/ruby-2.3.0/gems/railties-5.0.1/lib/rails/application.rb:442:in run_tasks_blocks'
/home/tim/.rvm/gems/ruby-2.3.0/gems/railties-5.0.1/lib/rails/engine.rb:457:in load_tasks' /home/tim/rails/modhoster_new/Rakefile:6:in <top (required)>'
/home/tim/.rvm/gems/ruby-2.3.0/gems/rake-12.0.0/exe/rake:27:in <top (required)>' /home/tim/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in eval'
/home/tim/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `

'
(See full trace by running task with --trace)