Restore `rake TEST=test/unit/foo_test.rb` support.
Restore `rake TEST=test/unit/foo_test.rb` support.

Add your own test tasks as dependencies on the `test:run` task instead of `test` itself.

  namespace :test do
    task run: 'test:acceptance'

    Rails::SubTestTask.new acceptance: 'test:prepare' do |t|
      t.libs << 'test'
      t.pattern = 'test/acceptance/**/*_test.rb'
    end
  end

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